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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. :

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:

.4 watt 100% Radio Shack DC-DC Converter -  This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts.  You don't need to build or wind any coils or transformers __ Designed by Don Klipstein

+/-12V-> +/-5V Power unit -  This is the voltage converter to get the voltage of ±5V from the input voltage of ±12V.  I am using the 3 terminal voltage regulator for the voltage to be changed in this unit.  As the regulator, LM317 is used for the positive voltage and LM337 is used for the negative voltage.  The output current can make output in 1 A __ Designed by Seiichi Inoue

+/-15V 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.  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.   __ Contact IQ Technologies

+30V Power Supply with +5V -  I made power supply which makes about +30V with +5V power supply.  Direct current is changed into alternating current by oscillator which used Schmitt trigger inverter which has hysteresis characteristic and resonance circuit.  high DC voltage (+50V) is made with alternating voltage using voltage amplification rectification circuit __ Designed by Seiichi Inoue

+5V Power Supply -  This circuit is a small +5V power supply, which is useful when experimenting with digital electronics.  Small inexpensive wall transformers with variable output voltage are available from any electronics shop and supermarket.  Those transformers are easily available, but __ Designed by Tomi Engdahl

+9 Volt*and*  9 Volt from One Battery! -  MAX1044 is a charge pump converter it uses a capacitor as a "bucket" to pump charge from one place to anor.  it can be used to generate negative voltage easily __ Designed by R.G. Keen

±5A, 2.5V (2-Quadrant) μModule Voltage Regulator -  The LTM8052 is a 36ViN, 5A, 2-quadrant constant-voltage, constant-current (CVCC) step-down μModule® regulator.  included in the package are the switching controller, power switches, inductor and support components.  Operating over an input voltage range of 6V to 36V, the LTM8052 supports an output voltage range of 1.2V to 24V.  __ Linear Technology/Analog Devices App Note, Mar 30th 2012

±5V to ±15V Tracking Supply -  The LT3032 is a dual, low noise, positive and negative low dropout voltage linear regulator.  Each regulator delivers up to 150mA with a typical 300mV dropout voltage.  Each regulator’s quiescent current is low (30μA operating and__ Linear Technology/Analog Devices App Note, Jan 30th 2012

0 to 30 Volt LAB Supply -  The linear power supply, shown in the schematic, provides 0-30 volts, at 1 amp, maximum, using a discrete transistor regulator with op-amp feedback to control the output voltage.  The supply was constructed in 1975 and has a constant current mode that is used to recharge batteries.   __ Designed by Michael Ellis

0 To 40v Lab Power Supply -  A very lab adjustable power supply that can provide an output voltage between 0 and 60 volts can be designed using this circuit diagram .  This lab power supply can be designed with LM723 chip or for higher output voltages, with L146 .Output current is also adjustable, but once established, is always effective.  Table 1__ 

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

0-1000 Volt Regulated High Voltage Power Supply -  input voltage from high voltage DC DC converter is 12V AC at 800mA current and then converted to DC through a bridge rectifier Diode 1A.  The voltage output of converter circuit can be adjusted in the range of 0-1000V DC.  This high __ Designed by Joseph Diverdi

0-14 volt, 0-2 Amp current limited variable power supply regulator -  When powering up a piece of Homebrew gear for the first time, it's nice to be able to slowly turn up the "juice" and have a current limiting feature, just in case there is a short circuit or other problem some place.  Here's a circuit for a fairly simple variable output / current limited regulator, which you can use with a fixed output bench supply, a gel-cell or use as part of a Homebrew bench supply.  The output voltage can be adjusted from 0 to 14 volts and the current limit set from 0 to 2 amps.  All the parts used are common, most can be obtained from Radio Shack, but you'd probably do much better with Mouser or Jamco, despite the shipping charges.  A circuit board for this project is available from FAR Circuits, www.  farcircuits.  net For $4.95 plus shipping and handling.  Look for the KD1JV Variable power supply board in the catalog.   __ Designed by Steven Weber, KD1JV

0-14V variable power supply with current limiting, Version 2 -  For the experimenter and homebrewer, a variable power supply with current limiting can be very handy.  There are not too many of these commercially available and those which are, are fairly expensive.  However, it does not cost much to build your own.  Version 2 of the variable power supply fixes a problem with the original design which was designed a number of years ago.  The problem is the current sense resistor is outside the voltage regulation feedback loop, which causes the output voltage to vary a little with current.  The voltage drop is only 200 mv for a 2A current and that generally isn't a problem, but it would be nice if that drop was not there.  This new circuit puts the current sense resistors on the supply side, rather then the ground return, so that the current sense resistors are inside the voltage regulation loop. __ Designed by Steven "Melt Solder" Weber  KD1JV

0-50v Variable Power Supply using LM317 -  Presented here is a 0-50V, 1A variable power supply that has been designed using positive-adjustable voltage regulator LM317 IC .  This IC normally generates voltages in the range of 1.2V to 25V, ...__ Electronics Projects for You

0v To 50 Volt Variable Regulator -  A very simple variable power supply circuit can be made using this electronic circuit diagram . This variable regulator circuit will provide an variable regulated output voltage , between 0 and 50 volts .  The CA3140 operational amplifier compares the regulator output to a reference voltage , that depends on the R9 value.0V to 50__ 

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

1.2-15V/3A adjustable regulated power supply -  This kit provides a variable output power supply ranging from 1.2 to 15 VAT3 A.  it uses Low Dropout Positive Regulator LM1084 in TO220 package for delivering variable output voltage.  __ 

1.2MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  LT3465 Switching Regulator__ Linear Technology/Analog Devices

1.3V Power Supply -  This is a replacement power source for 1.3V mercury cells or other small batteries.  it has many uses and I use this circuit in my computer to power a front panel multI adapter which has a digital thermometer __ Designed by Andy Collinson

10-15W watt 100% Radio Shack DC-DC Converter -  This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts.  You don't need to build or wind any coils or transformers.  This is a cheap-and-dirty experimenter's circuit.  I tested this and it worked for me, but I disclaim all warranties!  __ Designed by Don Klipstein

12 VDC: 120 VAC Inverter Schematic -  This inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000 (1 KW) watts__ Global Village Institute for Appropriate Technology

12 Volt 20 Amp Power Supply -  A 12 Volt high current 20 Amp power supply.  The output voltage is variable from 12.2 Volt to 14.4V so can be set for any device requiring voltage and current in that range.  This PSU uses an LM723 as the regulator, 4 parallel connected outboard pass transistors and has current limiting above 25 amps __ Designed by Andy Collison

12 Volt 30 Amp Power Supply -  uses a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to30 amps __ Designed by Andy Collison

12 Volt Alarm Power Supply -  A 12 Volt power supplied designed for Ron's Modular Burglar Alarm.  However, being a popular supply voltage this circuit will have many other uses as well.   __ Designed by Andy Collison

12 Volt Battery Charge Monitor -  Here is a battery monitor circuit which disconnects the load when the battery is discharged, preventing a deep discharge which could cause permanent battery damage.  The battery is automatically reconnected when a battery charger or other DC source is connected across the load.  Select a relay which requires less than 100ma coil current and with contacts capable of handling the load and charging __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

12 Volt Power Supply -  Please operate caution when building this power supply.  it is run on standard 117 ac current and under right circumstances 117 ac can kill you.  Use a plastic enclosure if possible to decrease chances of short-circuiting.  Don't use power  supply if it's wet, and never run it without specified fuse.   __ Designed by Andy Wilson

12 Volt to 9 Volt DC Converter -  To get a more precise output voltage, replace zener diode Z1 with 10V and R1 with a 1Kilo ohm potentiometer.  A Coolrib for Q1 is optional but highly recommended.  You can replace Q1 for a more robust type to get more output amps depending on your requirements.  Simple circuit to power your 9 volt cassette recorder and other stuff __ Designed by Tony van Roon  VA3AVR

12+ Volt Voltage Doubler -  This circuit was originally designed to operate a 15 volt regulator from an unregulated 12 volt AC adapter, but can be used for whenever you need more than 12 volts from a 12 volt supply.  I'm posting it because one reader built a 12 volt DC to AC converter __ Designed by Andrew R. Morris

120W, 24V 5A Output Buck-Boost Voltage Regulator -  The buck-boost converter shown in this figure regulates 24V with 0A–5A load at up to 98.5% efficiency (Figure 2).  it operates from an input voltage range of 12V to 58V.  Adjustable undervoltage and overvoltage lockout protect the circuit.  it has short-circuit protection and the SHORT output flag indicates when there is a short__ Linear Technology/Analog Devices App Note, Oct 3, 2012

12V Distribution in μTCA Redundant Power Subsystem -  The LTC4225 offers ideal diode and Hot Swap functions for two power rails by controlling external series connected N-channel MOSFETs.  MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area.  Hot Swap control MOSFETs allow boards to be safely inserted__ Linear Technology/Analog Devices App Note, Apr 22, 2011

12V Output Converter Accepts 4V to 80V Input (5.5V Minimum to Start) -  The LT8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage.  The part has integrated input current, input voltage, output current and output voltage feedback loops.  With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8705__ Linear Technology/Analog Devices App Note, Feb 15th 2013

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

12V-24Vin to 5VoutAT1.4A Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 2.5A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

12V-24Vin to 5VoutAT350mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3574 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 0.65A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

12V-24Vin to Four Output 12VAT120mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 2.5A, 60V NPN power switch is integrated along with all control__ Linear Technology/Analog Devices App Note, Jan 27th 2011

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


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