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Regulator Circuits
Regulators:  #'s - A       B - G       H - Q       R - S       T  - Z


Last Updated: December 07, 2017 02:04 PM
Circuits Designed by Dave Johnson, P.E. :

Miniature Pushbutton On/Off Switch - In many battery powered devices, you would like to turn the circuit on and off by pressing a small pushbutton switch.  One press turns the device on and second press turns it back off.  The flip/flop circuit below uses a minimum number of parts to perform . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Nine-Volt Battery Eliminator - If you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David A. Johnson P.E.-December, 2009

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


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

Miniature Pushbutton On/Off Switch -  in many battery powered devices, you would like to turn the circuit on and off by pressing a small pushbutton switch.  One press turns the device on and second press turns it back off.  The flip/flop circuit below uses a minimum number of parts to perform . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Minimizing Switching-Regulator residue in Linear-Regulator Outputs -  12/05/05  EDN Technical Article: Banishing those accursed spikes takes attention to detail and understanding the subtleties.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Misc. Regulator Circuits -    NOTE: Scroll down - This simple regulator provides excellent performance when the input voltage is several volts above the output voltage. The output voltage is set by the zener and is approximately 0.6 volts above the zener's rating. __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Monolithic Step-Down Regulator Withstands the Rigors of Automotive Environments & Consumes Only 100µA of Quiescent Current -  DN378 Design Notes __ Linear Technology/Analog Devices

Monolithic Switching Regulator with 100µV Output Noise -  AN70 Linear Technology This publication details circuitry and applications considerations for the LT1533 low noise switching regulator.  Eleven DC/DC converter circuits are presented, some offering <100µV output noise in a 100MHz bandwidth.  Tutorial sections detail low noise DC/DC design, measurement, probing and layout techniques, and magnetics selection.  __ Linear Technology/Analog Devices

Monolithic Synchronous Regulator Drives 4A Loads with FeW External Components -  DN328 Design Notes__ Linear Technology/Analog Devices

Monolithic Synchronous Step-Down Regulators Pack 600mA Current Rating in a ThinSOT Package -  DN300 Design Notes__ Linear Technology/Analog Devices

MOSFET LDO Voltage Regulator -  This circuit has excellent voltage regulation, due to positive feedback through R2 however the circuit must be started up.  This is done by Q4 and Q5.  if the circuit does not need to be started under load, Q4, Q5, and R6 can be deleted.  You must then pl __ Designed by Andrew R. Morris

MOSFET shunt regulator substitutes for series regulator -  25-Nov-04 EDN Design Ideas:  You would normally use a series linear regulator or a DC/DC converter to obtain 3V dc from a higher supply.  However, when breadboarding a concept, you may be able to use a shunt regulator, especially if a series regulator of the correct voltage is unavailable.  The MOSFET in Figure 1 can replace a zener diode in a shunt regulator and provide lower output impedance than a zener diode __ Circuit Design by Stuart R Michaels, SRM Consulting

Motor Accu Ladder -  Article is in Dutch __ Designed by Jan Hammer

Negative Regulator Has &0.4V Dropout Voltage -  11/07/96  EDN Design Ideas:  Figure 1 shows a negative low-dropout (LDO) regulator capable of providing output voltages from –2 to –16V, with load currents greater than –3A.  LDO regulators, which can maintain output regulation with less than 1V of i/O span, are popular because of the __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

New High Efficiency Monolithic Synchronous Step-Down Regulator works with Single or Dual Li-ION Batteries -  DN201 Design Notes__ Linear Technology/Analog Devices

New LTC1266 Switching Regulator Provides High Efficiency at 10A Loads -  DN103 Design Notes__ Linear Technology/Analog Devices

New Micropower Low Dropout Regulators Ease Battery Supply Designs -  DN121 Design Notes__ Linear Technology/Analog Devices

New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency -  DN68 Design Notes__ Linear Technology/Analog Devices

Nine-Volt Battery Eliminator -  if you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David A. Johnson P.E.-December, 2009

No Design Switching Regulator 5V 5A Buck Step Down Regulator -  DN48 Design Notes__ Linear Technology/Analog Devices

No Design Switiching Regulator 5V Buck/Boost Positive to Negative Regulator -  DN49 Design Notes__ Linear Technology/Analog Devices

Obtain Higher Voltage From a Buck Regulator -  29-May-03 EDN Design Ideas:  Several semiconductor vendors'current-mode buck controllers have input-voltage ranges of 30 to 36V but have output-voltage ranges from the reference voltage to approximately 6V.  This output-voltage constraint arises from the common-mode-voltage limitation of the current-sense amplifier.  in real-world applications, the power-supply designer must be able to generate high output voltage for printe __ Circuit Design by Ajmal Godil, Micrel Semiconductor, San Diego, CA

Optimize output-voltage accuracy of adjustable low-dropout regulator -  EDN-Design ideas--09/01/98    Optimize output-voltage accuracy of adjustable low-dropout regulators - An adjustable LDO is a good choice when you need a nonstandard voltage, but getting the highest accuracy from one requires a few circuit tricks.  --Low-dropout regulators (LDOs) have become common in portable electronic equipment.  Their small size, high noise rejection, and low cost make them an attractive solution to a range of system problems—from active power-supply decoupling to local voltage regulation and control.  Although LDO suppliers offer several fixed output-voltage settings, some applications require settings that you can't get in an off-the-shelf produ __ Circuit Design by Paul Paglia, Telcom Semiconductor

Optocoupler Makes a Simple Circuit Low-Dropout Regulator -  01/06/11 EDN Design Ideas:  A zener or two LEDs serve as the reference voltage.  [Design ideas - by Marc Ysebaert, De Pinte, Belgium __ Circuit Design by Marc Ysebaert, De Pinte, Belgium

Paralleled Voltage Regulators with Balanced Load Sharing -  Paralleling voltage regulators to provide mode load current is a common technique.  Forcing the amplifiers to share the load current equally is called ballasting.  Using a precision low offset voltage amplifier to sense the output current from each regulator requires just milli-ohms of resistance, typically just a pcb circuit trace.  Each amplifier then adjusts the output voltage of each regulator to force the output currents to be equal.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Part 1: 200W-48 AdvancedTCA Hot Swap Controller with I2C Input/Output Monitoring & Power Good Watchdog -  The LTC4261 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane.  Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate.  The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses __ Linear Technology/Analog Devices App Note, Mar 26th 2010

Part 2: 200W-48 AdvancedTCA Hot Swap Controller with I2C Input/Output Monitoring & Power Good Watchdog -  The LTC4261 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane.  Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate.  The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses __ Linear Technology/Analog Devices App Note, Mar 26th 2010

Performance Enhancement Techniques for 3-Terminal Regulators -  AN2 Linear Technology This App Note describes a number of enhancement circuit techniques used with existing 3-terminal regulators which extend current capability, limit power dissipation, provide high voltage output, operate from 110VAC or 220VAC without the need to switch transformer windings, and many other usefu application ideas.  __ Linear Technology/Analog Devices

Performance Enhancement Techniques for Three-Terminal Regulators -  Linear Technology AN2 __ Designed by Jim Williams - Aug 2nd, 1984

Performance Verification of Low Noise, Low Dropout Regulators -  Linear Technology AN83 __ Designed by Jim Williams - Mar 1st, 2000

PLL-based converter controls light source -  EDN Design Ideas:  July 2, 1998        [  NOTE:    FILE
has multiple design, scroll for this one.]  Using the circuit in Figure 1, you can digitally control the light intensity of a lamp.  The control loop is based on a PLL, in which the VCO comprises a light-to-frequency converter (TSL220) coupled to a light source that derives its drive from a switching regulator (L4970A).  The output of the phase/frequency comparator (4046) serves as the control voltage for the switching regulator.  The control voltage is proportional to the frequency error between the reference frequency (fREF) and the signal frequency (fiN) coming from the light-to-frequency converter. __ Circuit Design by Masso Gottardi, ITC-IRST, Trento, Italy

Portable 3.3V & 5V Regulator -  A DiY kit for Arduino xBee or other projects. __ Contact Jameco Electronics

Positive regulator makes dual negative-output converter -  06/26/03  EDN Design Ideas:  Some systems, such as optical networks, require than one negative voltage.  A common procedure is to boost the main negative supply of -5V to -10V and then reduce it with a linear regulator to -9V.  The -5V itself comes from a positiv __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Positive regulator makes negative DC/DC converter -  12/26/02 EDN Design Ideas:  Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost DC/DC converters.  Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs  that have positive-reference feedback voltages far outnumber these negative-feedback regulators __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Postregulation technique efficiently supplies multiple output voltages -  01/15/98  EDN Design Ideas:  Various methods for regulating multiple-output power supplies exist.  An emerging technique--secondary-side postregulation, or SSPR--provide as advantages for high-frequency, high-power-density DC/DC converters.  Many electronic devices require two or more __ Circuit Design by Gedaly Levin, Cherry Semiconductor Corp

Power Supplies -  There are a number of ways to obtain the low voltages required to run small projects from the wall power outlet. The simplest way is to buy a factory-built molded supply which is designed to plug directly into the wall outlet. Some such supplies have an internal voltage regulator and need no additional parts, others provide an unregulated DC voltage and many are simply AC transformers in a box. The regulated types offer less power output for a given size with currents limited to a couple of hundred milliamps but the AC transformer types can provide several amps __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Power Supply Converted from a PC -  Our energy-hungry and environmentally aware society has been slow to make good use of the sun's "free" power. But now it's finally taking off. Using the sun's heat directly, for cooking and other applications, is already a common and popular technology in countries that have good weather. Hot-water panels are nowadays used in many parts of the world, in combination with a gas or electric powered water heater to help out when the weather doesn't help. But at the same time, electric solar panels are still expensive, justifying their use only as a novelty, or in locations where little power is needed, and bringing in commercial power would be even more expensive. __ Designed by Manfred Mornhinweg

Power Supply Modules for the P54C-VR Pentiumr Microprocessor -  AN63  This App Note describes the design of both linear and switching regulators which provide power for 90MHz Pentium (r) processors.  The circuits are intended to comply with intel's modular power supply specification and provide sufficient power for cache RAM and chip sets in addition to the CPU__ Linear Technology/Analog Devices

Power Supply Voltage & Current Regulated -  A Versatile and Most useful device, Especially for the Beginner __ Designed by G.L. Chemelec

Power USB VBUS in Autos with the LT8697 -  USB sockets appear in an increasing number of car models as portable devices become more ubiquitous.  The USB interface delivers power to portable devices via the 5V VBUS and ground lines.  Depending on the USB version and the portable device, the VBUS sources up to 2.1A.  in a car, this high VBUS current presents a challenge.  __ Linear Technology/Analog Devices App Note, Trevor Crane Design Engineer-Power Products Jul 15th 2013

Proportional thermoregulator synchronizes to line -  04/13/00 EDN Design Ideas:  The circuit in Figure 1 is a proportional thermoregulator in which the switching of the TRIAC occurs when the mains voltage crosses the zero level.  As a result, the circuit generates no RFi.  The circuit can easily achieve linear regulation and perfect isolation between the control and power sections.  Whenever the mains voltage crosses zero, a 1-msec positive pulse appears at the collector of Q 1 .   __ Circuit Design by Jordan Dimitrov

Protection Feature Enhances Boost Converter -  10/27/94 EDN Design Ideas:  A boost-topology switching regulator is the simplest solution for converting a two to three-cell input to a 5V output.  Unfortunately, boost regulators have several inherent disadvantages, including a lack of short-circuit protection and shutdown capability.  in some battery-operated __ Circuit Design by Dimitry Goder, Linear Technology Corp, Milpitas, CA

PWM IC makes synchronous gate driver -  02/02/99 EDN-Design ideas (contains several designs, scroll to find this one) A system with a µP, memory, and peripherals usually requires several power-supply voltages.  Designers typically use local switching regulators to produce the desired voltage rails.  One of the most common topologies, the synchronous buck regulator, converts a 5 or 12V bus to some other, lower voltage.   __ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Quad Output Switching Converter Provides Power for Large TFT LCD Panels -  DN349 Design Notes__ Linear Technology/Analog Devices

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Regulators:  #'s - A       B - G       H - Q       R - S       T  - Z


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