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Voltage Regulator Circuits

Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S      
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Last Updated: 11/30/2017 07:17 AM

Circuits Designed by Dave Johnson, P.E. :
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

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:

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

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 Bjrn Starmark and Orville Buenaventura, Maxim Integrated Products Inc, Sunnyvale, CA, and Sren Kck, Audiovxlar, 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 PCMPWM modulator device and a PWM power output device.  The PCMPWM 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 Designs vs. Design Ideas: Related, or not? -  EDN Design Ideas:  07/09/2013    The battle is on.  Which do you prefer, Dis, or manufacturers' reference designs? __ Circuit Design

Reference Designs-Poll conclusions -  07/19/13  EDN Design Ideas:  Our opinions are illuminated, and one or two surprises lurk, in the Reference Design poll results.   __ Circuit Design by Michael Dunn

Reference Divide by 4 -  The LT5400 is a quad resistor network with excellent matching specifications over the entire temperature range.  All four resistors can be accessed and biased independently, making the LT5400 a convenient and versatile choice for any application that can benefit from matched resistors.  These resistor networks provide precise ratiometric stability required in highly accurate difference amplifiers, voltage references and bridge circuits.  __ Linear Technology/Analog Devices App Note, June 23, 2011

Reference Divider with Op Amp Input Bias Current Balancing -  The LT5400 is a quad resistor network with excellent matching specifications over the entire temperature range.  All four resistors can be accessed and biased independently, making the LT5400 a convenient and versatile choice for any application that can benefit from matched resistors.  These resistor networks provide precise ratiometric stability required in highly accurate difference amplifiers, voltage references and bridge circuits.  __ Linear Technology/Analog Devices App Note, June 23, 2011

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

Regenerative LDO Voltage Regulator -  if an integrated circuit low-dropout (LDO) voltage regulator that exactly meets your needs is not available, you can make your own discreet version with the simple high performing circuit.  This circuit employs what I call a regenerative amplifier, which  __ Designed by Andrew R. Morris

Regulate a 0 to 500V, 10-Ma Power Supply In a Different Way -  12/20/2012-EDN Design Ideas:  Contemporary power supplies use switching techniques to achieve the desired output voltage from the primary source.  Switching power supplies, however, are often too noisy to be used in sensitive analog circuits.  You may find linear power supply __ Circuit Design by Dusan Ponikvar

Regulated 12V Supply -  This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation.  Approximately 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 Charge Pump Delivers 50ma -  App Note #35__ Maxim Integrated

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

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 output 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 feeble at the set-up voltage.   __ Designed by braincambre500 @ yahoo.com

Regulated PSU -  I always require a small test power supply for my hobby work.  Considering that for my rough tests I can not use (or be allowed! !) expensive digital power supplies, I decided to make this small power supply which works with my 12V SMPS Adaptor which I already own. __ Designed by Nina Gajjar

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 Technologys 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 provide as 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 provide 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, Monitor, 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 side as 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

Robust 10MHz reference clock input protection & distributor for RF systems -  07/31/14  LTC Design Notes: Design a protected 10MHz reference input without degrading phase noise. __ Circuit Design by LTC Design Note

Royer Topology Achieves 100μVp-p Noise at 250V Output -  This circuit's resonant Royer topology achieves 100μVP-P noise at 250V output by minimizing high frequency harmonic in the power drive stage.  The self oscillating resonant Royer circuitry is composed of Q2, Q3, C1, T1 and L1.  Current flow through L1 causes the T1, Q2, Q3, C1 circuitry to oscillate in resonant fashion, supplying __ Linear Technology/Analog Devices App Note, Apr 22, 2011

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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Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S       T - Z


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