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Voltage Regulator Circuits, Page 1
Voltage Regulators:  #'s       A      B-C      D - F      G - L      M - R      S - Z
Last Updated on: Tuesday, April 01, 2014 04:30 AM


Circuits Designed by Dave Johnson, P.E. :
  • 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 around a very common LM317 adjustable voltage regulator. ...
  • 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.


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
+5V Power Supply Circuit -  This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily available, but [Tomi Engdahl's design]
0 to 30 Volt Lab Supply -  (electronic schematic / circuit added 4/02)
1.2 Volt Reference -  National Semiconductor Application Note 04-Nov-1995 / (app note added 8/03)
1.2-15V/3A adjustable regulated power supply -  …. [Site is under construction right now]
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… [Aaron Cake's design]
1.5A High Efficiency Synchronous Switching Regulator Evaluation Board -   evaluation board is designed to supply 3.3V at 15 mA up to 1.5A.  input voltage range is 4V to 14V. Components were selected based on  design procedure in  LM2651 datasheet. PCB layout is critical to reduce noise and ensure…. (app note added 3/05)
12 Volt 30 Amp Power Supply (Andy Collinson) -  uses a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to30 amps.... [Circuit Design by Andy Collison]
12 Volt Alarm Power Supply -  A 12 Volt power suppiled designed for Ron's Modular Burglar Alarm. However, being a popular supply voltage this circuit will have many other uses as well….(circuit / schematic design added 6/06)
12 Volt to 9 Volt DC Converter -  Car Converter for12 Volt to 9V ….
12V 30A PSU -  uses a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to30 amps (added 10/09)
+12V 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 that I had posted and noticed that he did not get 12VAC out. That isn’t possible with 12 volts input to that circuit because the peak voltage needed would be 17 volts. This circuit will solve that problem....[Designed by Andrew R. Morris]
13.8 Volt 20A PSU -  This is a Regulated DC power supply with short circuit protection and with current limiter. (added 6/03)
13.8V 20A Power Supply -  As is commonly the case, this supply was born of necessity. There is absolutely nothing special about the circuit, except that as shown, it is quite capable of up to 20 Amps intermittently or 10A continuous. Simply use a bigger transformer, bridge rectifier and more capacitors and output transistors to get more current. The basic circuit should be good for up to 100A or so, using a 5A TO3 regulator IC, but it can obviously be increased further (if you really do need a 500A supply!). ….(design added 11/08)
13.8V 20A PSU -  This is a Regulated DC power supply with short circuit protection and with current limiter.  (electronic design added 6/07)
16-bit adjustable reference uses 8-bit digital potentiometers -  25-Dec-03 Issue of EDN  It may be easy to find a precision voltage reference for your application; however, a programmable precision reference is another matter. The circuit in Figure 1 yields a precision reference with an LSB of 62.5 µV. The circuit is a 16-bit DAC using three 8-bit digital potentiometers and three CMOS op amps.... [Design Idea by Bonnie Baker, Tucson, AZ]
1A Variable Regulated Power Supply -  A 'must-have' for the experimenter.  (electronic design 05/09) [from Peter Parker's website]
2 AA cells power step-down regulator -  01/07/99 Issue of EDN  DC/DC conversion is particularly challenging when both the input and output voltages are low. Step-up ICs that operate with inputs lower than 1V are available, but step-down ICs that accept input voltages....Page includes several designs.  Scroll to find this one.... [Design Idea by Len Sherman, Maxim Integrated Products, Sunnyvale, CA]
232 Volt Dimmer -  Find out how to put together a simple but efficient PWM dimmer circuit for LEDs…. [REUK - Renewable Energy UK website]
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.... [Designed by David A. Johnson]
2-Step Voltage Regulation Improves: Design Notes Linear Technology added 01/06 -  DN209  Design Notes (Linear Technology) (app note added 1/06)
3-Terminal Regulator is Adjustable -  National Semiconductor Application Note  (app note added 2/06)
40V 2A LM317 & TIP42 Power Supply -  A very good and powerful Regulated Power Supply section was implemented by simply adding a PNP power transistor to the excellent LM317T adjustable regulator chip. In this way this circuit was able to deliver much more than the power required to drive two Mini-MosFet amplifiers to full output (at least 2Amp @ 40V into 4 Ohm load) without any appreciable effort. ….(electronic schematic added 11/08)
4-20 mA Digital-to-Process Current Transmitter -  AN-21 Analog Devices Application Note....[App Note]Describes a 3 I.C. Digital to 4-20 mA Current Output Circuit (DAC08, REF01 and OP221)
4MHz Monolithic Synchronous Step-Down Regulators Bring High Efficiency to Space-Sensitive Applications -  DN304  Design Notes (Linear Technology) (app note added 1/06)
5 Volt Power Supply -  (electronic circuit added 9/03)
5 Watt Universal Input Dual Output Isolated TNY266 -  This design kit is a 5 W Universal Input Dual Output Isolated power supply using  TNY266 chip.  (added 3/05)
555 on 24v -  If you need to operate a 555 on 24v, you will need to reduce the voltage to less than 18v. The following circuits reduce the voltage to 12v….
78xx power supply -  Of all the voltage regulator ICs, the 78xx family is by far the most established. Not surprisingly! It's difficult to get performance this good with so few outside components necessary. Just like the famous LM317, the 78xx family incorporates…(added 04/05/06)
78xx Regulator Board -  circuit board and circuit for making voltage regulators based on 78xx ICs, in PDF format, text in Finnish (added 5/02)
9 Volt 2 Amp Power Supply -  A simple 9 Volt 2 amp supply using a single IC regulator. (added 6/03)
9  Volt Stabilized Power Supply -  Circuit only, no discription is included…. [Tony van Roon's circuit]
9V to 2A PSU -  A simple 9 Volt 2 amp supply using a single IC regulator.  There is little to be said about this circuit. All  work is done by  regulator. The 78S09 can deliver up to 2 amps continuous output whilst maintaining a low noise and very well regulated supply....(added 11/05)

Voltage Regulators:  #'s       A      B-C      D - F      G - L      M - R      S - Z


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