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Converters Voltage
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Last Updated:  Thursday November 30, 2017 07:38:56 AM

Circuits Designed by Dave Johnson, P.E.

RS-232 Serial Interface Status Indicator CircuitI designed this circuit many years ago and have used it several times since.  It uses a single logic IC to indicate the TXD and RXD line activity of a typical RS-232 serial data communications link.  The thresholds are set at plus 3 volts and minus 3 volts.  Two dual color LEDs are used as indicator lights . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2007

Servo Pulse to Voltage ConverterA while back a Discover Circuits visitor needed a way to convert servo pulses from a radio controlled device into a voltage.  The drawing below, illustrates the pulse train of the received signal.  The time between pulses is a fixed 20ms while the pulse widths vary from a low of 1ms to a high of 2ms . . . Hobby Circuit designed by David Johnson P.E.-August, 2005

Simple Circuit Negative Supply CircuitThis simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Touch Switch 240VA - CThis is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

Voltage BoostIn this design a marginal AC to DC linear power supply provides a voltage boost, so it can maintain regulation at low line voltages.  The added components are wired at the AC input and the + DC output of an existing bridge rectifier circuit.  The components act as a full wave “charge pump” which will boost the DC output voltage across the main filter capacitor C3.  Without the boost circuit, when the AC line voltage drops to 105vac, the DC output voltage only reaches 11.5 volts, too low for a 12v voltage regulator. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Voltage Converters-0.5 to 6 VoltsConventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

 
 

RD68HC908IRC : MC68HC908QT2 Based Simple Circuit Infrared Remote Control Reference Design -  Motorola has developed a simple, single dedicated device, infrared remote control designed to control a DVD player.  This reference design demonstrates how to time and create modulated infrared signals used to control six basic functions of the DVD player.   __ Designed by Freescale

RD68HC908LBC : Li-ION Battery Charger Reference Design -  This reference design describes a Li-ion battery charger for one 3.6V Li-ion battery cell by using the low cost 8-pin MC68HC908QT2 MCU.  This reference demo provides reader a reference on how to implement constant current, constant voltage charging method for Li-ion battery and how to in-circuit-programming M68HC908QT/QY MCU in system __ Designed by Freescale

Rearranged reference helps ADC measure its own supply voltage -  28-Apr-05 EDN-Design Ideas Clever topology allows self-measurement of power supply rail__ Circuit Design by Björn Starmark and Orville Buenaventura, Maxim Integrated Products Inc, Sunnyvale, CA, and Sören Käck, Audioväxlar, Sweden

Recover the leakage energy of a flyback transformer -  04/18/13  EDN-Design Ideas This design can recover the leakage energy of a flyback transformer and minimize over-voltage stress to the switching device.  __ Circuit Design by Todor Arsenov

Reduce EMI by sweeping a power supply's frequency -  27-May-04 EDN-Design Ideas Switching power supplies can be notorious noise generators.  You should prevent this noise, which is conducted, radiated, or both, from returning to the input source, where it can potentially wreak havoc on other devices operating from the same input power.  The goal of an EMI(electromagnetic-interference] filter is to block this noise and provide a low-impedance path back to the noise source__ Circuit Design by John Betten, Texas Instruments, Dallas, TX

Reduce voltage-reference output noise by half -  3-Feb-05 EDN-Design Ideas Reducing low-frequency(1/f] noise generated by an IC voltage reference can prove difficult.  In theory, adding a lowpass filter to a reference's output reduces noise.  In practice, a lowpass RC filter for suppression of noise frequencies below 10 Hz requires large values of series resistance and shunt capacitance__ Circuit Design by Alfredo H Saab and Steve Logan, Maxim Integrated Products Inc, Sunnyvale, CA

Reference Design for the TAS5110DAD Digital Audio PWM Power Output Stage -  The true digital audio amplifiers (TDAA) system consists of a PCM–PWM modulator device and a PWM power output device.  The PCM–PWM processor accepts a serial PCM digital audio stream and converts it to a 3.3 -V PWM audio stream.  The TDAA output stage provides a large-signal PWM output.  The digital PWM __

Reference stabilizes exponential current -  10/25/01 EDN-Design Ideas In an antilog converter, the difference between the base voltages of two transistors sets the ratio of their collector currents  The use of matched transistors balances the first-order temperature coefficient but leaves a temperature-dependent gain term, q/kT.  Classic antilog circuits use a thermistor in the drive circuitry to correct this temperature dependency__ Circuit Design by Tom Napier, North Wales, PA

Regulated 12V Supply -  This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation.  Aprroximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply.  This circuit can supply loads of up to 500 mA.  This circuit is also known as an amplified zener circuit __ Designed by Mick Devine

Regulated DC Power Supply -  many power supply designs for different voltages, built from discrete components __ Designed by Sunamura Kazuhiro

Regulated High-Voltage Supply for Valve Amplifiers -  How to modify a surplus PC power supply to produce a 700V or 400V high-voltage rail.___ SiliconChip

Regulated Linear power supply with LM317-1.5, 3, 4.5, 5, 6 & 9 Volt -  Normally begin to learn about electronics power supply from the battery, for example, 9 volts, 1.5 volts, 6 volts etc.  But there are disadvantage that when using battery power is discharged.  I need to buy a new one.  Consume more.  We should the dc power supply have a choice of AC voltage.  Which it must […] __ Designed by Antonio Rodrigues

Regulated Power Source for your Electronics Lab -  A regulated power source is not only an instrument that supplies direct current to your circuits at the desired level.  it also allows you to have a previous idea about how the circuit operates.  Having a volt-meter and an ampere-meter at the ouput of the unit, one knows immediately if there is a short or open circuit in the circuitry layout.  And you would know first hand, if the current is excessive or too feble at the set-up voltage.   __ Designed by braincambre500 @ yahoo.com

Regulator Can Source & Sink Current -  12/07/95  EDN-Design Ideas Although a positive supply regulator usually acts solely as a current source, some applications require both sourcing and sinking.  For these applications, Linear Technology’s LT1118 family of low-dropout regulators can source and sink as much as 800 and 4__ Circuit Design by Bill Schweber Linear Technology Corp, Milpitas, CA.

Regulator Excels in Noise & Line Rejection -  Certain electronic circuits require extremely low-noise power supplies and this circuit provIdeas very good quality power output.  __ Circuit Design by Walt Jung, Analog Devices Inc, Norwood, MA

Regulator Generates as Many as Four Voltages -  08/03/95 EDN-Design Ideas The inexpensive switching regulator in Fig 1 provIdeas as many as four voltages using a single quad comparator.  The circuit can implement two positive regulated supplies and two semiregulated negative supplies that use a charge-pump technique.  Fig 1's circuit, which costs $4.48 in moderate volumes, shows three of the four possible output voltages, ±9V and 150V.  You can add a 150V supply using the same charge-pump techniques as the 9V supply.  Output current of the +9V supply is nominally 10 mA.   __ Circuit Design by D Hayden, Hayden Electronics Design, San Diego, CA

Regulator Generates Both 3.3V & 5V Outputs from 3.3V or 5V to Run Computers & RS-232 -  DN71 Design Notes___ Linear Technology/Analog Devices

Regulator Generates Sub-Bandgap Voltage -  01/02/97 EDN-Design Ideas 100-mA regulator that uses a dual linear-regulator IC to produce output voltages below1.25V from2.9 to5.5V input-voltage range__ Circuit Design by Ronald Young and Luong Huynh, Maxim Integrated Products, Sunnyvale, CA

Regulator has One Active Part -  03/16/95 EDN-Design Ideas The regulator of unusual simplicity (ROUS) in Fig 1 derives a low-voltage, low-current output from rectified 115 to 270V ac.  Pass transistor Q1 is the regulator's only active component.   __ Circuit Design by Kennan C Herrick, ESI Electronics Corp San Francisco, CA

Regulator IC forms convenient overvoltage Detector -  09/28/00 EDN-Design Ideas Figure 1 shows a simple, stand-alone overvoltage detector.  The intent of the circuit is to monitor a voltage, VMONITOR, and set the output, VOUT, high when the monitored voltage exceeds a preset threshold.  The minimum allowable threshold for this circuit is 1.25V.  The operation of the circuit revolves around the TLV431 shunt regulator.  This IC is based on the popular TL431 shunt regulator.  The difference is that the TLV431's internal reference is 1.25V, as opposed to 2.5V for the TL431.  When the voltage at the control input is less than 1.25V, the regulator's cathode current is essentially zero__ Circuit Design by Robert Bell

Regulator Makes Dual Tracking Reference -  11/07/96 EDN-Design Ideas You can use the venerable 723 voltage regulator in new and unusual ways.  For example, you can modify its topology as in Figure 1 to yield a low-component-count, dual-polarity tracking voltage reference.  The 723, a long-time standard in power-supply design, is a flexible IC that includes a temperature-compensated voltage reference, an error amplifier,__ Circuit Design by James Mears, National Semiconductor, Tacoma, WA

Regulator Monitors its input voltage -  09/12/97 EDN-Design Ideas Two- and three-cell portable systems, such as medical sensors, often monitor their battery input to obtain an early warning of a loss of battery voltage.  Typically, this warning is a digital signal that a comparator generates and then sends to the microcontroller.  The circuit in Figure 1 presets one side of a dual linear regulator to generate 2.84V at 100 mA.  The other side operates open loop, as a comparator, to generate the low-battery warning.  Both sIdeas are capable of delivering 100- mA output current.  Resistors R1 and R2 determine the low-battery threshold, according to__ Circuit Design by Larry Suppan and Luong Huynh, Maxim Integrated Products, Sunnyvale, CA

Regulator provides ±12V -  10/23/97 EDN-Design Ideas Simple circuit can provide ±12V from a5V input using only one switching-regulator IC and a few off-the-shelf__ Circuit Design by Musiri Shrivathsan, National Semiconductor Corp, Santa Clara, CA

RS-232 Serial Interface Status Indicator Circuit -  I designed this circuit many years ago and have used it several times since.  It uses a single logic IC to indicate the TXD and RXD line activity of a typical RS-232 serial data communications link.  The thresholds are set at plus 3 volts and minus 3 volts.  Two dual color LEDs are used as indicator lights . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2007

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Safe Hot Swapping using the LTC1421 -  DN139 Design Notes __ Linear Technology/Analog Devices

Scheme Adds Sequencing & Shutdown Control to Regulator -  10/30/03  EDN-Design Ideas Modern microprocessor- or FP-GA-based circuits require separate and independent power-supply voltages for the core and the I/O circuits.  Some devices require stringent control of the turn-on characteristics and sequencing of these __ Circuit Design by Said Jackson, Equator Technologies Inc, Campbell, CA

Secondary Side Dual Output Controller Tightly Regulates Two Isolated Outputs -  DN1000 Design Notes __ Linear Technology/Analog Devices

Self switching Power Supply -  One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its output voltage is variable.  This is achieved by connecting a potentiometer between common terminal of regulator IC and ground.  For every 100-ohm increment in the in-circuit value of the resistance of potentiometer VR1,  __

Self-modifying code extends addressing Mode -  12/17/98 EDN-Design Ideas As just about any assembly-language programmer knows, self-modifying code (SMC) is usually undesirable, unintentional, and destructive.  However, the SMC routine in Listing 1 is extremely useful to extend the indexed, 16-bit offset addressing mode of the venerable HC05 µC from 8 bits, or 256 locations, to the full 13-bit (8-kbyte) memory address space that the µC’s architecture supports.  This routine is very useful for error tables, text messages tables, or any array manipulation for a large number of elements.   Circuit Design   Paul Sofianos, Motorola Inc, Tempe, AZ

Series Regulator with Q900 -  This is a series regulator with Q900 being the control element, Q901 a driver, and Q902 an error amp.  ZD900 forms the emitter reference voltage source.  Since the generated high voltage and other voltages are linked by means of the magnetic field of T900, any change in H.  V.  will be reflected back to all of the other voltages.   __ Designed by Chris Candreva

Serves as milliohmmeter -  04/15/04 EDN-Design Ideas When I was recently debugging a design, I discovered that a short circuit existed from a ground plane to a power plane.  I did not have access to a milliohm meter or an equivalent tester for locating this type of short circuit.  So, I logged onto the Internet to find an easily constructible milliohm meter__ Circuit Design by AM Hunt, Lancaster Hunt Systems Ltd, Shepperton, UK

Servo loop improves linear-regulator efficiency -  8-Jul-04 EDN-Design Ideas Linear regulators are easy to implement and have better noise and drift characteristics than switching approaches.  Their largest disadvantage is inefficiency  excess energy dissipated as heat.  Several well-known techniques are available to minimize the input-to-output voltage across a linear regulator__ Circuit Design by Aurel Gontean, Technical University, Timisoara, Romania

Servo Pulse to Voltage Converter -  A while back a Discover Circuits visitor needed a way to convert servo pulses from a radio controlled device into a voltage.  The drawing below, illustrates the pulse train of the received signal.  The time between pulses is a fixed 20ms while the pulse widths vary from a low of 1ms to a high of 2ms . . . Hobby Circuit designed by David Johnson P.E.-August, 2005

Shunt regulator eases power-supply-start-up woes -  10/27/05  EDN-Design Ideas Ensure regulator start-up under light output load__ Circuit Design by Michael O'Loughlin, Texas Instruments, Nashua, NH

Shunt regulator provides overvoltage protection -  01/15/98 EDN-Design Ideas The circuit in Figure 1 uses a typical technique for varying the output voltage of a power supply via a programmable control voltage.  Although the topology and schematic details of the power supply are not critical, the protection technique is noveThis File contains several Design Ideas, please scoll to this one[This design idea by ROBERT N BUONO, MAHWAH, NJ]__ Circuit Design by ROBERT N BUONO, MAHWAH, NJ

Shunt regulator serves as inexpensive Op Amp in power supplies -  09/15/05 EDN-Design Ideas Use low-cost power-regulator IC to replacecostly op amp in power supplies__ Circuit Design by Michael O'Loughlin, Texas Instruments, Nashua, NH

Shunt regulator speeds power supply's start-up -  12/16/05 EDN-Design Ideas Reconfiguring the start-up shunt regulator can reduce bootstrap time__ Circuit Design by Michael O'Loughlin

Signal Conditioning & Power Conversion -  AN75 Linear Technology This publication includes designs for data converters and signal conditioners, transducer circuits, crystal oscillators and power converters.  Wideband and micropower circuitry receive special attention.  Tutorials on micropower design techniques and parasitic effects of test equipment are included.  __ Linear Technology/Analog Devices

Simple Circuit +5V power supply -  This circuit is a small +5V power supply, which is useful when experimenting with digital electronics.  Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket.  Those transformers are easily available, but __ Designed by Tomi Engdahl

Simple Circuit +5V Power Supply -  In this tutorial we make a simple 5V DC power supply from initial idea to finished product.  This is not an exercise in making a flash power supply, just solving a problem with the parts at hand.   __ Designed by John Boxall

Simple Circuit DC/DC converter increases available power in dual voltage systE - M -  8-Jan-04 EDN-Design Ideas The schematic in Figure 1 shows a way to increase the power available from a current-limited 5V supply by adding power from a -5V supply.  The DC/DC converter generates a single 12V, 150-mA(1.8W] output from two regulated and current-limited input sources at 5V, 300 mA(1.5W] and -5V, 300 mA(1.5W]__ Circuit Design by David Kim, Linear Technology, Milpitas, CA

Simple Circuit High Efficiency Step-Down Switching Regulator -  DN73 Design Notes___ Linear Technology/Analog Devices

Simple Circuit Negative Supply Circuit -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Simple Circuit regulated power supply with overcurrent trip -  Here's a circuit for a relatively simple regulated power supply which has well controlled characteristics, including a clever over-current trip.   __ Designed by Richard Torrens

Simple Circuit Regulator Has One Active Part -  03/16/95 EDN-Design Ideas The regulator of unusual simplicity (ROUS) in Fig 1 derives a low-voltage, low-current output from rectified 115 to 270V ac.  Pass transistor Q1 is the regulator's only active component.   __ Circuit Design by Kennan C Herrick, ESI Electronics Corp San Francisco, CA

Simple Circuit regulator Monitors its input voltage -  09/12/97 EDN-Design Ideas Two- and three-cell portable systems, such as medical sensors, often monitor their battery input to obtain an early warning of a loss of battery voltage.  Typically, this warning is a digital signal that a comparator generates and then sends to the microcontroller.  The circuit in Figure 1 presets one side of a dual linear regulator to generate 2.84V at 100 mA.  The other side operates open loop, as a comparator, to generate the low-battery warning.  Both sIdeas are capable of delivering 100- mA output current.  Resistors R1 and R2 determine the low-battery threshold, according to__ Circuit Design by Larry Suppan and Luong Huynh, Maxim Integrated Products, Sunnyvale, CA

Simple Circuit regulator provides ±12V -  10/23/97 EDN-Design Ideas Simple circuit can provide ±12V from a5V input using only one switching-regulator IC and a few off-the-shelf__ Circuit Design by Musiri Shrivathsan, National Semiconductor Corp, Santa Clara, CA

Simple Circuit serves as milliohmmeter -  04/15/04 EDN-Design Ideas When I was recently debugging a design, I discovered that a short circuit existed from a ground plane to a power plane.  I did not have access to a milliohm meter or an equivalent tester for locating this type of short circuit.  So, I logged onto the Internet to find an easily constructible milliohm meter__ Circuit Design by AM Hunt, Lancaster Hunt Systems Ltd, Shepperton, UK

Simple Circuit Switching Regulator -  NOTE : Scroll downWhen batteries are used to power lower voltage circuits, a switching regulator is desirable to conserve battery life. There are excellent ICs that can do the job with great efficiency and small size. An example is the Maxim (www.maximic.com) MAX639 which converts inputs from 5.5 to 11.5 volts to 5 volts at up to 225mA.  The only additional parts are an inductor, schottky rectifier and a couple of capacitors. The following circuit is a discrete switcher similar in power handling capability to the MAX639. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Simple Circuit technique improves transient Dynamics -  06/24/99 EDN-Design Ideas Designing low-voltage, high-current converters with fast dynamic performance places stringent demands on a system designer.  However, a simple technique reduces the peak voltage deviation and decreases the response time for a tran__ Circuit Design by Robert Sheehan, Linear Technology Corp, Milpitas, CA

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Simple Circuit Ultra-Low Dropout Regulator -  DN32 Design Notes___ Linear Technology/Analog Devices

Simple Power Supply Fits Into Small Spaces -  11/13/03 EDN-Design Ideas The demand for negative-voltage power supplies is increasing with the popularity of applications for portable devices.  It can be expensive and relatively complicated to generate a negative supply from a positive input source, especially when the design requires both positive and negative outputs__ Circuit Design by Raymond Zheng, Linear Technology, Milpitas, CA

Single Cell Operation -  AN15 1.5V powered circuits for complex linear functions are detailed.  Designs include a V/F converter, a 10-bit A/D, sample-hold amplifiers, a switching regulator and other circuits.  Also included is a section of component considerations for 1.5V powered linear circuits.  __ Linear Technology/Analog Devices

Single-Pulse Voltage Multiplier -  09/18/03  EDN-Design Ideas It is sometimes necessary for a microcontroller to generate a pulse whose voltage is higher than the power-supply voltage of the microcontroller.  The circuit in Figure 1 allows you to generate 14V pulses from a 5V power supply.  An __ Circuit Design by Richard Cappels, Mesa, AZ

Solar Panel Regulator -  This handy solar panel regulator measures the voltage across your battery or the charging current and will disconnect the panel to stop overcharging.  It works with 12V or 24V systems and has a 3.5-digit liquid crystal display.___ SiliconChip

SOT-23 Switching Regulator with Integrated 1A Switch Delivers High Current Outputs in a Small Footprint -  DN232 Design Notes___ Linear Technology/Analog Devices

Step-Down Switching Regulators -  AN35 Discusses the LT107) 4, an easily applied step-down regulator IC.  Basic concepts and circuits are described along with more sophisticated applications.  Six appended sections cover LT107) 4 circuitry detail, inductor and discrete component selection, current measuring techniques, efficiency considerations and other topics (appnote 2/06) __ Linear Technology/Analog Devices

Stereo-amplifier IC's outputs drive multiple loads -  11/21/05  EDN-Design Ideas Reference provIdeas constant bias voltage regardless of supply-voltage variations__ Circuit Design by Jean-Jacques Avenel, Maxim Integrated Products, Lesigny, France

Supply Delivers Pin-Programmable Multiple References -  1-May-03 EDN-Design Ideas In the circuit of Figure 1, the REF01, IC1, is a buried-zener-diode-based, precision 10V reference that features minimal noise and drift over temperature.  The circuit provIdeas not only the 10V output of the REF01, but also a 5V output that a REF02 reference would deliver.  In addition, the circuit provIdeas -5V, -10V, and an unbalanced dual reference, the sum of whose voltages is precisely 10V__ Circuit Design by V Manoharan, Kochi, India

Supply Savess From Lax Predecessor -  11/23/94 EDN-Design Ideas The lab supply in Fig 1 automatically sets its output voltage to zero whenever you switch it on.  Thus, the lab supply can't fry your circuit if the previous user left the voltage turned up too high.  The circuit supplies 1 to 25V dc because it uses an LM317 regulator.  When you turn on the supply, the bridge develops__ Circuit Design by Tian Jin-gin, Taiyuan Semiconductor Factory, Taiyuan, Shanxi, China

Switch Mode DC Supply -  The switching power supply, shown in the schematic, provides12 volts, at10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit.  The supply was constructed in1984 and is variable frequency, as opposed to the pulse width modulator (PWM) controllers used today __ Designed by Michael Ellis

Switched-Capacitor IC & Reference Form Elegant –48 to +10V Converter -  04/24/03  EDN-Design Ideas A system designer must almost always face a trade-off in choosing the right part for an application.  The trade-off usually involves performance, price, and function.  An example is the issue of powering circuits from a telecom-voltage source.  Telecom systems almost exclusively use high-potential negative rails, such as -48V__ Circuit Design by Wallace Ly, National Semiconductor, Santa Clara, CA

Switching regulator 2 -  I introduce the switching regulator which used MC34063A of the MOTOROLA, Inc.  in this page.  This regulator is housed in the DIP (Dual In line Packge) with 8 pins.  The 1.5-A output current can be gotten without the heatsink in spite of this size.  The input voltage can be used from 3 V to 40 V and can do the function of the Step Up (making the output voltage which is higher than the input voltage) , the Step Down (making the output voltage which is lower than the input voltage) and moreover Inverting __ Designed by Seiichi Inoue

Switching regulator charges NiMH
batteries
-  12/21/00 EDN-Design Ideas Many NiMH
(nickel-metal-hydride) fast chargers use linear regulators, such as the LM317, in a current-source configuration with a charge-monitor IC.  This arrangement dissipates much heat and requires considerable heat sinking, ad__ Circuit Design by Jason Hansen and Jim Hill, On Semiconductor, Phoenix, AZ

Switching Regulator Collection -  AN30 Switching regulators are of universal interest.  has made a major effort to address this topic.  A catalog of circuits has been compiled so that a design engineer can swiftly determine which converter type is best.  This catalog serves as a visual index to be browsed through for a specific or general interest.  __ Linear Technology/Analog Devices

Switching Regulator Controls CCFT -  02/16/95 EDN-Design Ideas You can control the current in a cold-cathode fluorescent tube(CCFT]and, hence, its brightness with a switching-regulator IC__ Circuit Design by Doug Vargha, Maxim Integrated Products Sunnyvale, CA

Switching regulator drives robot Motor -  05/13/99 EDN-Design Ideas The circuit in Figure 1 shows an example of how you can use an integrated switching regulator(ISR] to efficiently vary the speed of a permanent-magnet dc motor.  In this application, the rotating head of a robot senses the presence of an oncoming object(perhaps a human].  If the robot senses an object, it slows the rotationPDF contains many circuits, scroll to find this one.   __ Circuit Design by Donald Comiskey, Power Trends Inc, Warrenville, IL

Switching regulator forms constant-current source -  05/30/02 EDN-Design Ideas Many applications require current sources rather than voltage sources.  When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor.  To solve the wasted-power problem, you can use a switch-mode regulator.  The circuit of Figure 1 uses IC1, an LM2576 adjustable regulator__ Circuit Design by Stefan Strozecki, Institute of Telecommunications, bydgoszcz, Poland

Switching Regulator Generates Both Positive & Negative Supply with a Single Inductor: Design Notes Linear Technology -  DN47 Design Notes___ Linear Technology/Analog Devices

Switching Regulator Output goes BeLow VREF -  03/17/94 EDN-Design Ideas The feedback arrangement of typical switching regulators doesn't allow the regulated outputs to go lower than the reference voltage.  If you try to lower the output by modifying the feedback network, the compensation components the manufacturer recommends may no longer stabilize the regulator's error amplifier__ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Switching regulator turns into light source -  07/17/97 EDN-Design Ideas Simple external feedback circuit transforms a switching regulator into a constant-intensity light source__ Circuit Design by Donald V Comiskey Jr, Power Trends Inc, Warrenville , IL

Switching Regulators for Poets -  Linear Technology AN25 __ Designed by Jim WilliamsSep 2nd, 1987

Switching-regulator Design lowers noise to 100 µV -  12/04/97 EDN-Design Ideas Expending unconscionable amounts of bypass capacitors, ferrite beads, shields, Mumetal, and aspirin to ameliorate noise-induced effects is no longer the only way to tackle switching-regulator noise.  Using a low-noise IC, you can now design switching converters with only 100 mV of noise.  Size, output-flexibility, and efficiency advantages have made switching regulators common in electronic apparatus.  The emphasis on these attributes has resulted in circuitry requiring minimal board area and with 95% efficiency.  Although these advantages are welcome, they necessitate compromising other parameters.   __ Circuit Design by Design by Jim Williams, Linear Technology Corp

Switching-regulator supply provides low-noise biasing for varactor diodes -  11/09/00  EDN-Design Ideas Low-voltage systems often need a locally generated high voltage.  Even for an application as noise-sensitive as varactor-diode biasing, a carefully planned switching-regulator-based design and layout can provide the necessary bias voltage.  __ Circuit Design by Jim Williams and J Phillips and G Vaughn, im Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.

Synchronized Regulator Produces Coherent Noise -  03/17/94 EDN-Design Ideas By using a gated-oscillator architecture instead of a clocked-PWM one, gated-oscillator-type switching regulators permit high efficiency over extended ranges of output current.  This architecture eliminates the housekeeping currents associated with the continuous operation of fixed-frequency designs.  Gated-oscillator regulators simply self-clock at whatever frequency is necessary to maintain the output voltage.  Typically, loop-oscillation frequency ranges from a few hertz to the kilohertz region, depending on the load.   __ Circuit Design by Jim Williams, Sean Gold, and Steve Pietkiewicz, Linear Technology, Milpitas, CA

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Technique Improves Transient Dynamics -  06/24/99 EDN-Design Ideas Designing low-voltage, high-current converters with fast dynamic performance places stringent demands on a system designer.  However, a simple technique reduces the peak voltage deviation and decreases the response time for a tran__ Circuit Design by Robert Sheehan, Linear Technology Corp, Milpitas, CA

The architecture of a low-noise, Low-dropout regulator -  05/11/00  EDN-Design Ideas Figure A shows a design scheme for a low-noise, low-dropout regulator that the LT176X through LT196X family of regulators uses.  This scheme minimizes noise transmission within the loop and minimizes noise from an unregulated input.  The bypass capacitor, C__ Circuit Design by EDN Staff

ThinSOT Micropower Buck Regulator has Low Output Ripple -  DN373 Design Notes___ Linear Technology/Analog Devices

ThinSOT Switching Regulator Controls Inrush Current -  DN365 Design Notes___ Linear Technology/Analog Devices

Three-Terminal Adjustable Regulators -  NOTE : Scroll downThe unregulated DC supply is a very common type and the simple regulator shown in fig.1 may be added for projects that require a stable voltage. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Three-V supply Delivers 12V p-p to piezo speaker 10/16/03  EDN-Design Ideas Low-profile piezoelectric speakers can provide quality sound for portable electronic devices, but they require voltage swings greater than 8V p-p across the speaker element.  Yet, most portable devices include only a low-voltage pow__ Circuit Design by Royce Higashi and Tony Doy, Maxim Integrated Products, Sunnyvale, CA

Tiny & Efficient Boost Converter Generates 5V at 3A from 3.3V Bus -  DN280 Design Notes___ Linear Technology/Analog Devices

Tiny Buck Regulator Accepts Inputs from 3.6V to 25V & Eliminates Heat Sink -  DN268 Design Notes___ Linear Technology/Analog Devices

Tiny Highly Flexible Dual Boost/Inverter Tracks Supplies -  DN357 Design Notes___ Linear Technology/Analog Devices

Tiny Regulators Drive White LED Backlights -  Design Notes 231___ Linear Technology/Analog Devices

Tiny Versatile Buck Regulators Operate from 3.6V to 36V Input -  DN367 Design Notes___ Linear Technology/Analog Devices

Touch Switch 240VA - C -  This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

Transformerless Power Supply -  I have received a few emails asking for a transformerless power supply.  Here is such a supply.  This supply uses no heavy step down transformer and has an extremely low parts count.  The circuit can be built very small and can supply small currents for small projects.  The major downfall of this supply is that it is not isolated from the AC line and can only supply small currents __ Designed by Aaron Cake

Transformerless Power Supply -  Power Supply Circuits:  This circuit will supply up to about 20mA at 12 volts.  It uses capacitive reactance instead of resistanceso it doesn't generate very much heat.  The circuit was designed to provide a cheap, compact power supply for CMOS logic circuits that require only a few milliamps.  The logic circuits were then used to control mains equipment, using an optically-isolated TRIAC. __ Designed by Ron J.

Transistor quickly wakes sleeping LDO -  09/01/98 EDN-Design Ideas NOTE :  File has many circuits, scroll down.  Portable systems, such as telephone handsets, make extensive use of low-dropout (LDO) regulators.  These components provide noise-sensitive parts with a stable power-supply line.  When a telephone enters standby mode, most of the circuits go to sleep by disabling the LDO's outputs.  Operating current thus drops to a minimal level.  When a user starts to dial a number, the LDO receives an enable signal and immediately delivers the nominal operating voltage.  Unfortunately, most low-noise LDOs use a bypass capacitor that briefly loads the internal reference voltage upon wake-up.__ Circuit Design by Christophe Basso, Motorola Semiconductor, Toulouse, France

Triggered spark gap -  This is purely a construction article.   __

Two AA cells power step-down regulator -  01/07/99 EDN-Design Ideas -   (Scroll to find this one)  DC/DC conversion is particularly challenging when both the input and output voltages are low.  Step-up ICs that operate with inputs lower than 1V are available, but step-down ICs that accept input voltages Page includes several designs.  __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

Two Channel Gate Driver for Large IGBT Modules -  The BG2A is a fully isolated two channel gate drive Circuit designed for use with dual IGBT modules.  The BG2A utilizes Powerex VLA500-01 or VLA502-01 hybrid gate drivers to provide efficient switching of modules rated up to 1400A.  The hybrid gate driver features a built-in high speed opto-coupler, short circuit protection and an isolated DC to DC converter with 2500VRMS isolation.   __

Two ICs Convert 4 20mA Signal to 0 5V Output -  App Note/ 823 / Aug-09___ Maxim Integrated

Two transistor regulators -  a theoretical discussion __ Designed by Richard Torrens

Two watt switching power supply -  In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor.  Energy is stored in the inductor while the transistor is on, and released into the load circuit when the transistor switches off.  The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts.  Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode.  The efficiency is about 80% using a high Q inductor.   __ Designed by Bill Bowden

C/co-voltage.htmPAGE 15

UCC3809 Evaluation Module -  The UCC3809EVM evaluation module is an isolated 10-W, 3.3 -V converter designed for telecom input voltages, nominally -48 Vdc, but ranging from -32 Vdc to -75 Vdc.  The UCC3809 economy primary-side controller is used as the pulse-width modulator (PWM) , combined with a TLV431 low-voltage adjustable-precision shunt regulator on the secondary side __

UCC3819 250-W PFC Boost follower PreRegulator Design -  This is an App Note that describes a reference design.  This paper reviews the benefits of a boost follower topology and the design of a 250-W PFC boost follower preregulator.   __

UCC38C42 25-Watt Self-Resonant Reset Forward -  This is an App Note that describes a reference design.  This reference design presents a self-resonant reset forward converter using the UCC38C42 BiCMOS Low-Power Current-Mode PWM Controller.  The input voltage for this converter is compatible with the telecom input voltage range of 36 VDC to 72 VDC.  The converter is designed to operate at a switching __

Ultra Low Drop Linear Regulator -  The circuit is a MOSFET based linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere.  Drop of a fewer millivolts is possible with better...___ Electronics Projects for You

UltraFast Linear Regulator Eliminates All Bulk Tantalum & Electrolytic Output Capacitors -  DN157 Design Notes __ Linear Technology/Analog Devices

Ultra-Low Dropout Regulator -  DN32 Design Notes___ Linear Technology/Analog Devices

UltraLow Noise Switching Power Supplies Simplify EMI Compliance -  DN316 Design Notes___ Linear Technology/Analog Devices

Ultra-low-noise low-dropout regulator achieves 6-nV/√Hz noise floor -  06/23/05  EDN-Design Ideas LDO has ultralow-noise output__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Universal DC-to-DC Converter -  This circuit will generate a smaller DC output voltage from a larger DC input voltage.  It is quick and simple to make and by changing the value of the zener diode, the circuit can be universally adapted to provide other output voltages.  The circuit and all diagrams represent a DC convertor with 12V battery input and 9Volt DC output __ Designed by Andy Collison

Universal Input 48W PFC Application -  The LT3798 is a constant voltage/constant current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter.  A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, __ Linear Technology/Analog Devices App Note, Dec 5th 2011

Universal Power Supply -  Linear regulators like LM317, LM337, 78xx and 79xx, Zener diodes (1.3W) and reference diodes (e.g., LM336) are quite inexpensive and widely available.  So you can use these liberally in power supplies.  Sometimes...___ Electronics Projects for You

Universal PS - U -  A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps.   __ Designed by Volker Jeschkeit

Universal Voltage Regulator Board -  Digital/Analog USB Data Logger, Pt.3___ SiliconChip

Use a 555 timer as a switch-mode power supply -  14-Nov-02 EDN-Design Ideas Most switch-mode power supplies rely on a PWM(pulse-width-modulated] output that is controlled via voltage feedback.  A 555-timer IC can inexpensively perform PWM.  The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation.  The design uses two 555s__ Circuit Design by Aaron Lager, Masterwork Electronics, Rohnert Park, CA

Using a PC power supply as a benchtop power supply -  This ATX PS board has leads for +5 (RED) , -5 (WHITE) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN).  Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes.  The fan has also been unplugged for better viewing.  Since this PS was converted for use in the logic and robotics labs, the selected voltages  __ Designed by Andy Batts

VFD (Vacuum Fluorescent Display) Flyback Power Supply -  The LT3758 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages.  It can be configured as either a boost, flyback, [Linear Technology, SepIC or inverting converter.  The LT3758 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply.  The___ Linear Technology/Analog Devices App Note, Jan 16th 2012

Voltage Boost -  In this design a marginal AC to DC linear power supply provides a voltage boost, so it can maintain regulation at low line voltages.  The added components are wired at the AC input and the + DC output of an existing bridge rectifier circuit.  The components act as a full wave “charge pump” which will boost the DC output voltage across the main filter capacitor C3.  Without the boost circuit, when the AC line voltage drops to 105vac, the DC output voltage only reaches 11.5 volts, too low for a 12v voltage regulator. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Voltage Converter -  Similar to the system used in modern aviation where an antenna array modulates the phase of an incoming signal.  The commercial system is known as Commutated Aerial Direction Finding (CADF) where a ring of 18 identical antennas are each switched on in sequence, just like winding a rotary switch round and round so that one antenna is always connected to the receiver.   __ Designed by Harry Lythall-SM0VPO

Voltage Converters-0.5 to 6 Volts -  Conventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007

Voltage Difference Magnifier -  NOTE : Must register on this site __ Designed by Published in Elecktor July/Augu, 2010

Voltage doubler -  this circuit rougly doubles the voltage of the input, however the current output is low.  doubled output is at 'V source.  '  __ Designed by Andy Wilson

Voltage doubler improves accuracy -  5-Feb-09 EDN-Design Ideas A transistor's low saturation voltage results in less loss__ Circuit Design by S Chekcheyev, Tiraspol, Moldova

Voltage Doubler uses Inherent Features of Push-Pull DC/DC Converter -  08/16/07 EDN-Design Ideas Paralleled Darlingtons drive a wide-range voltage doubler__ Circuit Design by Ajoy Raman, Aeronautical Development Establishment, Bangalore, India

Voltage Level Translator-23001.0  -  Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Voltage Level Translator-23002.0  -  Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Voltage Limiter Generates Supplies that Improve Standard Diode Technique -  Some systems require a voltage limiter to protect the input circuit.  Designers can connect diodes to V CC and Gnd to create a simple solution (Fig.1).  This simplicity, however, comes at a __ Designed by Yossi Barkan

Voltage Reference Collection -  AN42 A wide variety of voltage reference circuits are detailed in this extensive guidebook of circuits.  The detailed schematics cover simple and precision approaches at a variety of power levels.  Included are 2 and 3 terminal devices in series and shunt modes for positive and negative polarities___ Linear Technology/Analog Devices

Voltage reference improves JFET -  26-Oct-00 EDN-Design Ideas The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's VP and IDSS variations.  These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a fixed R1.  Most users of JFET current-sources sample VPPDF has several circuits, scroll to find this one__ Circuit Design by Clayton Grantham, National Semiconductor, Tucson, AZ

Voltage reference is software-programmable -  08/18/05 EDN-Design Ideas Obtain extra reference voltages from existing ones__ Circuit Design by Reza Moghimi, Analog Devices, San Jose, CA

Voltage reference sets current limit -  11/19/98 EDN-Design Ideas NOTE :  File contain several designs.  Scroll to find this one.  Power op amps have a real need for active output-current limiting.  Most power-amplifier designs rely on the voltage drop across a user-supplied sense resistor to turn on an internal transistor.  This method has several drawbacks, notably, an inability to change the current-limit point under program control.  The current-limit circuit in Figure 1 allows you to establish the setpoint by applying a voltage to one of the amplifier's pins.__ Circuit Design by Joe Engle, Burr-Brown Corp, Tucson, AZ

Voltage Regulator -  This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation.  Aprroximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply.  This circuit can supply loads of up to 500 mA.  This circuit is also known as an amplified zener circuit __ Designed by Andy Collison

Voltage Regulator controls scanner Lamp brightness -  05/13/99 EDN-Design Ideas An image-scanning device performs best when the scanner IC controls the brightness of the image reflected into the light sensors.  The best way to control brightness is by adjusting the intensity, or light output, of the fluoresce__ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Voltage Regulator goes Digital -  11/24/99 EDN-Design Ideas Power consumption and failing batteries are key issues in battery-operated applications.  Features in the new generation of series voltage regulators address these concerns.  For example, National Semiconductor's LP2951 micropower voltage regulator provIdeas a logic-level output signal indicating a low regulated__ Circuit Design by Chuck Wojslaw, Xicor Inc, Milpitas, CA

Water Level Reference Design -  The Water Level Reference design continuously monitors water level and water flow using the temperature compensated MPXM2010GS pressure sensor in the low cost MPAK package, a dual op–amp, and the MC68HC908QT4, 8–pin microcontroller.  This system uses very few components, reducing the overall system cost.   __ Designed by Freescale

Wide Input Range High Efficiency DDR Termination Power Supply Achieves Fast Transient Response -  DN281 Design Notes___ Linear Technology/Analog Devices

Wide-range regulator Delivers 12V, 3A output from 16 to 100V source -  06/23/05  EDN-Design Ideas Buck regulator tackles high input voltages__ Circuit Design by Wayne Rewinkel, National Semiconductor, Schaumburg, IL

Wide-range voltage regulator automatically selects operating-mode -  06/09/05  EDN-Design Ideas Regulator seamlessly adapts to wide output range__ Circuit Design by Joel Setton, Crolles, France

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