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Voltage Regulator Circuits

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


Last Updated: 09/14/2017 03:19 PM

Circuits Designed by Dave Johnson, P.E. :

Capaciatance-Based Touch Switch -  This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Caps Provide Voltage Boost to Series Regulator -  This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  it can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply. . . Circuit by David Johnson P.E.-January, 1998

Circuit Eliminates 9v Battery -  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 c . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2009

Classic Linear 5v 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. . . Circuit by David Johnson P.E.-February, 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:

Digital Motor Speed Regulator -  Andrew Morris had a problem with a small rotary tool built in China.  The tool fit nicely in the hand was useful for precision cutting, drilling, and polishing.  Yet for delicate work, the tool was in bad need of a speed regulator.  Andrew had developed an analog motor speed regulator back in the mid-1990s, but this time, he wanted the benefits of a digital regulator.  The digital version was just as efficient, but it was less expensive to build and easier to assemble.  The digital circuit also provided more torque.   __ Designed by Andrew Morris' Gadget Freak-Case #226

Digital potentiometer programs & stabilizes voltage reference -  05/30/02 EDN Design Ideas:  The potentiometer portion of a mixed-signal, digitally programmable potentiometer adds variability to an analog circuit, and its digital controls provide programmability.  You can use a digital potentiometer in two ways in an analog circuit.  You can use it as a two-terminal variable resistance, or rheostat, or as a three-terminal resistive divider __ Circuit Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA

Digital Variable Resistor Compensates Voltage Regulator -  9-Jul-09 EDN Design Ideas:  A look-up table compensates for temperature drift __ Circuit Design by Jason Andrews, Maxim Integrated Products Inc, Dallas, TX

Digitally Programmable-Gain Amplifier Uses Divergent-Exponential Curve -  01/08/09  EDN Design Ideas:  The divergent-exponential and negative time constants are the core concepts of the DENT (differential-divergent-exponential-negative-time-constant] digitally programmable-gain-amplifier topology __ Circuit Design by W Stephen Woodward, Chapel Hill, NC

Diodes improve inverter efficiency  -  04/29/99  EDN-Design ideas –  NOTE:  Scroll to find this circuit.   in "Switched-capacitor regulator provides gain" (EDN, March 13, 1998, pg 80) a switched-capacitor voltage inverter wired as a supply splitter steps a positive voltage down to an output voltage equal to half the supply voltage. __ Circuit Design by Jeff Witt, Linear Technology Corp, Milpitas, CA

Direct Current Ignition Reference Design -  This manual describes a reference design of a Digital Direct Current ignition for Motorbike by using the MC68HC908JK3.  The Motorola MC68HC908JK3 is a member of the HC08 Family of microcontrollers (MCUs).  it is a 8-bit low cost general purpose MCU with 16-bit free run timer.  The features of the MC68HC908JK3 include input capture and output __ Designed by Freescale

Directly Parallel This High Power Density Linear Regulator-LT3080 -  The LT3080 is a new architecture for linear regulators.  it provides better regulation, a simple output adjustment with a single resistor where the output can be adjusted down to zero.  Also, this architecture allows easy paralleling of regulators for no heatsink operation in an all surface mount applications.  The LT3080__ Linear Technology/Analog Devices App Note, Robert Dobkin-Vice President-Engineering and Chief Technical Officer Sep 15th 2008

Discreet LDO Voltage Regulator -  Do you need a simple LDO voltage regulator, but an IC version that meets your needs is not available? Make your own using this circuit.  The circuit in the drawing is the actual circuit that I built and used successfully to power a shortwave radio which  __ Designed by Andrew R. Morris

Discrete Component Voltage Regulator -  While integrated circuits have become a staple of all modern circuit designs, it is still possible to build circuits without IC ’s and still achieve a high level of performance.  The circuit in Figure 1 is a high performance 5 volt voltage regulator built using discrete components that are readily available.  I have used no IC ’s and I have even substituted a 1N4001 in lieu of a zener diode.  The regulator output voltage varies by a mere .4% and has current limiting at 1.5 amps along with short circuit protection.  With the exception of thermal shutdown, this circuit closely matches the performance of the 7805 5 volt regulator IC . __ Designed by N1HFX

Discrete Low-drop Regulator -    NOTE: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Don't Be Fooled by Voltage Reference Long-Term Drift & Hysteresis -  DN229 Design Notes__ Linear Technology/Analog Devices

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,  __ Designed by Don Klipstein

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

Double Data Rate Power Supply using the Tl5002 Voltage Tracking Regulator -  The TL5002EVM-180 synchronous buck converter provides a 12A reference design for evaluating the performance of the TL5002 PWM control IC and the TPS2837 MOSFET driver for Double Data Rate (DDR) memory applications.  __ 

Drill Speed Regulator -  A mini-drill machine is always needed in drilling the printed circuit board.  it is usually powered by batteries that limit the drill’s capacity. Using a power supply adaptor with a speed regulator like the one featured here can certainly improve the performance of the drill.  The speed regulator can maintain the speed of the drill no__ 

Dual +/  15 Volt Power Supply -  suitable for powering OpAmp circuits__ 

Dual +/-25V LAB Supply -  Up to 800mA (typical) output current at +/-25V.   __ Designed by Rod Elliott  ESP

Dual 12V & 3.3V Hot Swap Application for Two Advanced Mezzanine Cards -  The LTC4242 Hot Swap controller allows safe board insertion and removal for two independent slots on a Pica Express backplane.  External N-channel transistors control the 12V and 3.3 V supplies while integrated switches control the 3.3 V auxiliary supplies.  Both 12V and 3.3 V supplies can be ramped up at an adjustable rate.  Dual __ Linear Technology/Analog Devices App Note, Mar 26th 2010

Dual 12V Power Supply -  Schematic only __ Designed by Tony van Roon  VA3AVR

Dual 13A μModule regulator with digital interface for remote Monitoring & control of power -  EDN Design Ideas:  04/06/2015    Digital power system management (PSM) enables on-demand telemetry capability to set, monitor, change, and log power parameters of dual high-current __ Circuit Design by LTC Design Note

Dual Buffered ±0.617V Reference Powered by Two AA Batteries -  Lower OpAmp is a precision inverter setting outputs to set the outputs at the same magnitude but opposite polarity.  The upper OpAmp drives the positive output so that the difference of the two outputs is the reference voltage, so the result is that half the reference voltage is the magnitude of the outputs__ Linear Technology/Analog Devices App Note, Jun 21st 2011

Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing & ±50mA VTT Reference -  11/01/13  EDN-Design Notes   Solid-state circuit breaker for microcontrollers.  The LTC3876 is a complete DDR power solution, compatible with DDR1, DDR2, DDR3, and DDR4 lower voltage standards.  The IC includes VDDQ and VTT DC/ DC controllers and a precision linear VTT reference.  A differential output sense amplifier and precision internal reference combine to offer an accurate VDDQ supply.  The VTT controller tracks the precision VTTR linear reference with less than 20mV total error.  The precision VTTR reference maintains 1.2% regulation accuracy, tracking one-half VDDQ over temperature for a ±50mA reference load.   __ Circuit Design by Ding Li

Dual output LDO 250mA/500mA evaluator with load simulator -  TPS70151EVM-152 provides a convenient method for evaluating the performance of TPS701xx dual output linear regulators.  The EVM provides proven and demonstrated reference designs and test modes to aid in evaluation.  __ 

Dual Output Regulator uses Only One Inductor -  DN100 Design Notes__ Linear Technology/Analog Devices

Dual Polarity Amplifier has Digital Control -  09/12/96 EDN Design Ideas:  The circuit in Figure 1 can amplify a signal either in an inverting or a noninverting mode.  When switch S1 is on and S2 is off, the circuit behaves as a regular inverting amplifier.  When S2 is on and S1 is off, the circuit feeds the signal to the noninverting input of the op amp; thus, the circuit behaves as a noninverting amplifier.  if S1 and S2 are monolithic analog switches, you __ Circuit Design by Rick Downs, Dallas Semiconductor Corp, Dallas, TX

Dual Polarity Output Converter Fits into Tight Spaces -  DN318 Design Notes__ Linear Technology/Analog Devices

Dual Polarity Power Supply -  This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts.  it is great for powering op amp circuits, as well as other circuits that require a dual supply voltage. 
 __ Designed by Aaron Cake

Dual power supply Delivers 8A with no heat sinks -  03/30/00 EDN Design Ideas:  The circuit in Figure 1 is a high-current dual supply that provide as 5 and 3.3V at currents as high as 8A.  The circuit uses a fixed-frequency, two-output, current-mode synchronous-buck- controller.  PFD contains several circuits, scroll to find this one __ Circuit Design by John Seago, Linear Technology Corp, Milpitas, CA

Dual PSU -  I reckon that every electronics hobbyist should build at least one general-purpose bench PSU.  Apart from being an invaluable piece of kit, the project will cover a reasonably wide range of topics, making it a very worthwhile learning exercise.   __ Designed by Mark Hennessy

Dual Regulated Power Supply -  in this circuit, the 7815 regulates the positive supply, and the 7915 regulates the negative supply.  The transformer should have a primary rating of 240/220 volts for Europe, or 120 volts for North America.  __ 

Dual Regulated Power Supply-PSU -  in this circuit, the 7815 regulates the positive supply, and the 7915 regulates the negative supply.  The transformer should have a primary rating of 240/220 volts for Europe, or 120 volts for North America.  The centre tapped secondary coil should be rated about 18 volts at 1 amp or higher, allowing for losses in the regulator.  An application for this type of circuit would be for a small regulated bench power supply __ Designed by Andy Collison

Dual Regulator Handles Two Input Voltages -  03/15/12  EDN Design Ideas:  (Originally published in the January 21, 1993, EDN-Design ideas) Use a pair of MOSFETs to switch between 3.3  and 5V regulated voltage.  The circuit in Fig 1 supplies both 3.3  and 5V to transitional circuits that employ both the new 3.3 V and older 5V devices.  Additionally, because the regulator accepts either 3.3  or 5V inputs, you could plug it into either a new 3.3 V system or an old 5V system.   __ Circuit Design by David L Dinsmore, Linear Technology Corp, Dallas, TX

Dual Regulators Power Pentium® Processor or Upgrade CPU -  DN122 Design Notes __ Linear Technology/Analog Devices

Dual Supercapacitor Backup Power Supply, 0.5V to 5V -  The LTC3122 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting.  The 2.5A current limit along with the ability to program output voltages up to 15V makes the LTC3122 well suited for a variety of demanding applications.  Once started, operation will continue with inputs down to 500mV, __ Linear Technology/Analog Devices App Note, Jun 19th 2013

Dual Switching Regulator Controller Operates from High Input Voltages LTC1267 -  DN114 Design Notes__ Linear Technology/Analog Devices

Dual Tracking + 15V -  The linear dual tracking power supply, shown in the schematic, provides 0-15 volts, at 1/4 amp, maximum, using a discrete transistor regulator with op-amp feedback to control the output voltage.  The supply was constructed in 1975; the negative output voltage tracks the positive output voltage.   __ Designed by Michael Ellis

Dual-output nonisolated SMPS powers appliances -  7-Dec-04 EDN Design Ideas:  Modern appliances offer a range of features that rely heavily on microcontrollers and auxiliary circuits.  Although conventional iron-core transformers can provide ac line-isolated, low-voltage power for a microprocessor, coupling the processor's control signals to line-side power switches requires yet another layer of electrical isolation, such as optocouplers or pulse transformers __ Circuit Design by Fabio Cacciotto, STMicroelectronics, Catania, Italy

Dual-Polarity Peak Detector Operates From Single Supply -  05/12/94 EDN Design Ideas:  The circuit in Fig 1  can detect the peak of either positive or negative inputs, yet it operates from a single supply.  The circuit uses two unity-gain amplifiers to monitor the input signal, one an inverting amplifier and the other a noninverting amplifier.  A typical application is driving a VU meter __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Dual-polarity supply provides ±12V from one IC -  29-Apr-04 EDN Design Ideas:  Well-regulated, dual-polarity power supplies find wide use in disk-drive, handheld-device, automotive, and notebook-computer applications.  in these applications, board space and allowable component heights are continually shrinking.  So, power-supply designers face the challenge of providing split rails with as few parts as possible, thus saving board space and cost __ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Dual-voltage regulator meets USB-power needs -  19-Aug-04 EDN Design Ideas:  This design idea stems from the limited availability of IC voltage regulators that can meet key USB-power specs, coupled with the need for turn-on sequencing and rise-time control at each output.  As always, for PC-related designs, minimum cost is a primary motivation.  USB specs require all loads to limit inrush current to less than 100 mA plus 50 µC of charge when powered on __ Circuit Design by Wayne Rewinkel, National Semiconductor, Phoenix, AZ

Dynamo Current & Voltage Regulator -  Useful for lovers of older cars, motorcycles and boats. __ Designed by Manfred Mornhinweg

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


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