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

Last Updated: October 24, 2017 02:55 PM

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

DC switching regulator (Mk I) -  This is an experimental circuit which rapidly "chops" a steady DC input voltage to produce a lower output voltage. Regulation is a function of the chopping - It is caused by the output transistor switching on and off around the target voltage, which when smoothed provides a constant DC output. __ Designed by Rowan from Melbourne, Australia

DC switching regulator (Mk II) -  A simpler and more efficient version of the above.  Uses a 78Lxx device as a voltage reference and a comparator.   __ Designed by Rowan from Melbourne, Australia

Decimal to BCD Convertor -  This circuit will provide an output in Binary Coded Decimal from any of the input switches.  The input switches may be expanded to 16 switches, providing a Hexadecimal to BCD conversion  __ Designed by Ron J.

Design a Simple, Efficient & Reliable Forward Converter -  Due to the high cost and inflexibility of isolated DC/DC converter modules, many designers are choosing to implement a discrete design that is better matched to their application.  in particular, the forward converter with active clamp reset has been widely used in custom supplies because of its excellent efficiency and reduced__ Linear Technology/Analog Devices App Note, Kurk Mathews Senior Applications Engineer-Power Products Jun 14th 2012

Design Notes 504: 42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current -  11/26/13  EDN-Design Notes   Measure inductance & capacitance over a wide range.  The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications.  To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation.  The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output.   __ Circuit Design by Hua  Walker Bai

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

Diode Turn-On Time Induced Failures in Switching Regulators -  Linear Technology AN122 __ Designed by Jim Williams - Jan 16th, 2009

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

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

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

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 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 PCi 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 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 Output Regulator uses Only One Inductor -  DN100 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 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 regulatates 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 regulatates 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 Supply from Single Battery Source -  This circuit provides both +9V as well as -9V supply from a single 9V battery.  it consists of timer 555 IC , negative-voltage regulator IC and a few discrete components.  __ 

Dual supply suits Portable systems -  10/14/00 EDN Design Ideas:  The primary concern with power management in portable equipment is to prolong battery life by eliminating unnecessary energy consumption.  The dual-output power supply in Figure 1 meets this objective and maintains regulated 5 and __ Circuit Design by Budge Ing, Maxim Integrated Products, Sunnyvale, CA

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

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

Efficiency characteristics of Switching Regulators -  AN46 Efficiency varies for different DC/DC converters.  This App Note compares the efficiency characteristics of some of the more popular types.  Step-up, step-down, flyback, negative-to-positive, and positive-to-negative are shown.  Appended sections discuss how to select the proper aluminum electrolytic capacitor and explain power switch and output diode loss calculations.  __ Linear Technology/Analog Devices

Emergency strobe flasher generates 250V -  08/05/99 EDN Design Ideas:  Figure 1 shows a complete circuit for an emergency lamp that operates from a 12V automotive battery.  The xenon flash tube requires a 250V-dc anode voltage and a 4-kV trigger pulse.  To generate the 250V dc, IC 1,  __ Circuit Design by Jose Luis Arce, Tecnosuma Havana, Cuba

Energy Harvesting Converter Operates from a Variety of Weak Sources -  The LTC3129 is a high efficiency, 200mA buck-boost DC/DC converter with a wide ViN and VOUT range.  it includes an accurate RUN pin threshold to allow predictable regulator turn-on and a maximum power point control (MPPC) capability that ensures maximum power extraction from non-ideal power sources such as photovoltaic panels.  __ Linear Technology/Analog Devices App Note, Feb 15th 2013

Extend low-output-voltage switching regulator's input range -  01/04/07  EDN Design Ideas:  Switching regulator improves efficiency and allows 36V input __ Circuit Design by Hua  Walker Bai, Linear Technology, Milpitas, CA

Finesse Regulator Noise -  System designers often find themselves battling power supply hum, noise, transients, and various perturbations wreaking havoc with low noise amplifiers, oscillators, and other sensitive devices.  Many voltage regulators have excessive levels of output noise including voltage spikes from switching circuits and high flicker noise levels from unfiltered references __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Fixed Voltage Regulators -  Use a voltage regulator to obtain a fixed voltage supply (at <1.5 Amps) from a variable source.   __ Designed by REUK-Renewable Energy UK website

Floating Input Extends Regulator Capabilities -  DN21 Design Notes __ Linear Technology/Analog Devices

Floating Supply for LCD Panel Meter -    NOTE: Scroll down - Did you ever install one of those low-cost LCD panel meters in a project only to discover that it requires a floating power supply? I just did!  The meter cannot share a DC ground with the voltage to be measured. The above circuit came to the rescue. it draws about 4 or 5 mA from the 9 volt supply and can supply up to 2 mA at 9 volts to the LCD meter or other load but the two capacitors isolate the grounds. Works like a champ!   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Get buck-boost performance from a boost regulator -  07/11/02 EDN Design Ideas:  The SEPIC  (single-ended, primary-inductance-converter] topology is generally a good choice for voltage regulators that must produce an on output voltage that falls in the middle of the input-voltage range, such as a 5V output from a 2.7 to 6V input, The topology has some disadvantages, however.  The efficiency of a SEPIC  circuit fares worse than that of buck and boost regulators, and SEPIC  desig __ Circuit Design by Tom Gross, Linear Technology Corp, Milpitas, CA

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


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