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Voltage Regulator Circuits

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


Last Updated: 11/30/2017 07:17 AM

Circuits Designed by Dave Johnson, P.E. :
0.5v to 6v Voltage Converter -  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 . . . Hobby Circuit designed by David Johnson P.E.-May, 2007

0VAC to 280VAC Variable Isolated AC Voltage -  I designed and built this circuit about 25 years ago.  it came in handy for many projects that were powered from 120 VAC, 240 VAC and 277 VAC.  it provides complete isolation from the power line.  it uses two 1:1 isolation transformers that are wired in parallel . . . Hobby Circuit designed by David Johnson P.E.-July, 2000

12v to 19v Laptop Power Supply (Concept) -  Concept Only.  I have a big screen HP laptop computer.  The large brick size AC to DC power supply is rated at 19.2v and 9.5 amps, which is about 180 watts.  I'd like to be able to use the thing in my car.  I looked into a 12v car adapter for it but never really found one that I liked.  Most were underpowered.  The other option was to use the existing AC to DC adapter and run it off power from a 12v to 120vac inverter. . . Circuit by David Johnson P.E.-July, 2009

12v-24v AC & DC Day/Night Switch -  The circuit uses a bridge rectifier circuit to convert AC into DC.  A 12v zener diode limits the operating voltage of the circuit to 12v.  A tiny Schmitt trigger inverter and a phototransistor detects the ambient light intensity.  if there is sufficient light, the inverter disables a push-pull oscillator circuit . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2012

240VAC to 5VDC Power Supply -  This is simple way to power some 5v logic from a 240vac source.  if a 120vac power adapter is used, the circuit will also work for 120vac power lines. . . Circuit by David Johnson P.E.-February, 2002

5+V Classic Linear Supply using 6.3VAC Transformer -  A classic method for producing a regulated +5v DC supply is shown below.  This circuit consists of an iron core transformer, a bridge rectifier, a filter capacitor and a voltage regulator.  Many people are tempted to use a very popular 6.3v transformer . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2009

9v 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 Johnson P.E.-December, 2009

AC to DC (240v to 5v)Power Supply -  This is simple way to power some 5v logic from a 240vac source.  if a 120vac power adapter is used, the circuit will also work for 120vac power lines . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002

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:

A 13.8V 20A PSU -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

A 24V/48V Hot Swap™ Controller -  DN226 Design Notes__ Linear Technology/Analog Devices

A 500kHz 6a Monolithic Boost Converter LT1370 -  DN183 Design Notes__ Linear Technology/Analog Devices

A doozy requiring some parts you can't get at the 'Shack. -  You can make a doozy of a xenon strobe using the 12 volt DC in, DC output mercury lamp ballast here at http://www.  donklipstein.  com/ebdc12.  html.  You may run into a problem with the flashtube arcing continuously after a flash.  if you use an open-collector comparator such as a 339 in the overvoltage sensing section of this circuit, you can wired-AND the comparator output with some sort of scheme to disable the circuit for a few to a few tens of milliseconds after a flash (by "pulling down" Pin 5 of the 555).   __ Designed by Don Klipstein

A Gentle Guide for the Trepidatious -  Linear Technology AN25 __ Designed by Jim Williams - Sep 2nd, 1987

A mad idea for a blacklight strobe -  Caution - May be both hard on your eyes and a bit disappointing __ Designed by Don Klipstein

A Monolithic Switching Regulator with 100µV Output Noise -  Linear Technology AN70 __ Designed by Jim Williams - Oct 1st, 1997

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

A repetitive trigger -  Based on the 555 timer IC , useful for strobe lights.  A bit on the 4017 counter IC for multiple flashes and sequences of flashes __ Designed by Don Klipstein

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

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

A Transformerless Power Supply -  Power Supply Circuits:  This circuit will supply up to about 20mA at 12 volts.  it uses capacitive reactance instead of resistance - so 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.

A Variable Power Supply for the FM Transmitters -  This is a fairly simple, yet very versatile workbench power supply.  With a current limit of 1.5 amperes and a variable voltage from 2.7 volts to 16.5 volts on the output of the LM317T, this unit will come in very handy for your diversified electronic projects (which usually include different DC voltages.  I have used it mainly for supplying my FM transmitters with different voltages, to see the different effects it has on the units.  in fact, I use it for all my FM transmitters.  it has served me well.  and is still serving proudly!  __ Designed by braincambre500 @ yahoo.com

A Variable power supply with adjustable current limiting -  A Variable power supply with adjustable current limiting - new design!  0-14V output up to 5A current.   __ Designed by Steven Weber, KD1JV

AC line powers microcontroller-based fan-speed regulator -  9-Nov-06 EDN Design Ideas:  A microcontroller requires dc operating power in the 2 to 5.5V range, an amount that a battery or a secondary power source can easily supply.  However, in certain situations, a microcontroller-based product must operate directly from a 120 or 220V-ac power outlet without a step-down transformer or a heat-producing, voltage-decreasing resistor. __ Circuit Design by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario, Canada

AC to DC (240v to 5v)Power Supply -  This is simple way to power some 5v logic from a 240vac source.  if a 120vac power adapter is used, the circuit will also work for 120vac power lines . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002

Achieving Microamp Quiescent Current in Switching Regulators -  DN11 Design Notes __ Linear Technology/Analog Devices

Active Shortwave Loop Antenna Loopifier? -  if you have a shortwave or high-frequency receiver or scanner that is struggling to capture signals with a short, whip antenna, and you'd like the kind of performance that a 60-foot 'longwire' antenna can provide but lack the space to put one up, consider __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Active-Preloading Provides Sinking Capability -  01/02/97 EDN Design Ideas:  A simple add-on circuit enables a unipolar power supply, usually a current-sourcing circuit only, to sink current from a load.    __ Circuit Design by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA

ADC's Reference Improves RTD Measurements -  10/27/94 EDN Design Ideas:  Temperature measurements using RTDs (resistance-temperature detectors]generally employ bridge circuits with stable power supplies for signal conditioning.  Unfortunately, this scheme generally produces nonlinear outputs.  A linear b __ Circuit Design by Bharat Heavy Electricals Ltd, Tiruchirapalli, India

Add a grounded-switch feature for Top Switch on/off control -  06/21/07  EDN Design Ideas:  Adding a couple of components to the control pin of a Topswitch switching regulator enables on/off control __ Circuit Design by Robert N Buono, Aeolian Audio LLC, Bloomfield, NJ

Add a signal-strength display to an FM receiver IC -  09/05/02  EDN Design Ideas:  The Philips (www.  semiconductors.  Philips.  co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output.  External components include one tunable LC circuit for the local oscillator, a few capacitor __ Circuit Design by José Miguel-López, RF Center Ltd, Barcelona, Spain

Add an auxiliary voltage to a buck regulator -  31-Oct-02 EDN Design Ideas:  You often need more than one regulated output voltage in a system.  A frequently used and reasonably simple way to create this auxiliary output voltage is to add a second winding to the output inductor, creating a coupled inductor or a transformer, followed by a diode to rectify (peak-detect] this output voltage __ Circuit Design by John Betten, Texas Instruments, Dallas, TX

Add foldback-current protection -  07/21/05  EDN Design Ideas:  Enhance three-terminal regulator with foldback oversight __ Circuit Design by Rafael García-Gil and JM Espí, Electronic Engineering Department, University of Valencia, Spain

Add gain to an absolute-value Amplifier -  08/22/02 EDN Design Ideas:  The absolute-value amplifier is a basic building block in test-and-measurement and signal-processing applications.  The addition of a DPP (digitally programmable potentiometer] adds another dimension, G (gain], to this key circuit.  Because the gain is programmable, you can use the circuit as an absolute-value amplifier (G&1] or an absolute-value attenuator (G>1] __ Circuit Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA

Add 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 icon 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

Add speech encoding/decoding to your Design -  02/04/99 EDN Design Ideas:  (Scroll to find this one) Adding speech capabilities to a design can sometimes lead to complex algorithms and expensive DSPs or specialized audio chips.  However, with  completion of a simplified adaptive differential pulse-code-modulation (ADPCM]algorithm, you can now implement se audio capabilities in low-cost 8-bit µCs, which typically.      Page includes several designs.   __ Circuit Design by Rodger Richey, Microchip Technology Inc, Chandler, AZ

Add trimmable current limit to DC/DC supply -  08/01/97 EDN Design Ideas:  You can add a simple, two-transistor circuit to a standard, step-down DC/DC converter to provide an adjustable limit for the output current.  You can apply this method to most step-down converters that provide access to the feedback node __ Circuit Design by Terry Millward, Maxim Integrated Products UK Ltd, Theale, UK

Added components improve switching-regulator stability -  09/29/05 EDN Design Ideas:  Extra components reduce effects of external load capacitance and ESR __ Circuit Design by Wayne Rewinkel, National Semiconductor, Schaumburg, IL

Adjustable 1.3-22V Regulated Power Supply -  Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce a fully regulated voltage ranging from 1.3V to 22V at currents up to 1A.__ SiliconChip

Adjustable DC-DC Converter for Cars -  Run your laptop in your car.  Charge SLA batteries and run 24V equipment from a 12V battery.__ SiliconChip

Adjustable Low-voltage Power Supply -  if you want to check the behaviour of an electronic circuit at low voltages, an adjustable power supply as shown here may be helpful.  Powered from a 3 to 16 volts source (DC for sure) , it will provide a stable output voltage in the 0 to 1.5 V range must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Adjustable Power Supply -  well filtered variable1.2-30 volts at5 amps using LM338K __ Designed by Aaron Cake

Adjustable power supply using LM317 -  voltage regulator for1.2V to35-Volt output voltages and up to1A load __ Designed by Tomi Engdahl

Adjustable Power Supply with Charger -  This power supply has adjustable and charger output.  The charger circuit can be use for cellular phone.  The adjustable output serves as multipurpose power supply.  it can handle a 1 ampere current.  The 317 must have a heat sink.   __ Designed by Milardo de Guzman

Adjustable Step Up Voltage Regulator -  Find out more about a step up voltage regulator used to output a voltage higher than the input voltage.   __ Designed by REUK-Renewable Energy UK website

Adjustable Voltage Motor Controller -  One of the nice things about flying electric is you can test run your motor in the house, workshop, or in the yard and the neighbors won't complain.  The problem is how to control the speed of the motor.  One way is to use the plane, radio, and speed control with the motor in it.  That's no fun!  __ Designed by One of the nice things about flying electric is you can test run your motor in the house, workshop, or in the yard and the neighbors won't complain. The problem is how to control the speed of the motor. One way is to use the plane, radio, and speed control with the motor in it. That's no fun! Mount the motor on the bench and just plug the battery into the motor. That's even worse! It's hard on the motor and gearbox.

Adjustable Voltage Regulator -  Many amateurs have stopped by their local Radio Shack store and have noticed the famous LM317T adjustable voltage regulator.  But, did you know that all voltage regulators are adjustable? Yes, any IC voltage regulator can be adjusted to a higher voltage than its fixed voltage by just adding a couple of resistors __ Designed by Radio Amateur Society of Norwich

Advanced TCA Hot Swap Controller Eases Power Distribution -  DN353 Design Notes   __ Linear Technology/Analog Devices

AdvancedTCA Four Fuse Monitoring Application -  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

AdvancedTCA with High-Side & Low-Side Ideal Diode-OR & Hot Swap Controller with I2C Current & Voltage Monitor -  The LTC4355 is a positive voltage ideal diode-OR controller that drives two external N-channel MOSFETs.  Forming the diode-OR with N-channel MOSFETs instead of Schottky diodes reduces power consumption, heat dissipation and PC board area.  __ Linear Technology/Analog Devices App Note, Mar 26th 2010

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

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