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Voltage Regulator Circuits
Voltage Regulators:  #'s-A;      B-F;      G-L;      M-Q;      R-U;      V-Z

Last Updated on: Tuesday, May 26, 2015 04:54 AM


Circuits Designed by Dave Johnson, P.E. :
  • 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.,  07/08/00]
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

+/-15V 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. 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. . . .  [by IQ Technologies Industry, unless otherwise noted online]

 

+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 web]

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. . . .  [by Michael Ellis]

 

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.,  07/08/00]

1.2 Volt Reference -  Application Note 04-Nov-1995. . .  [National Semiconductor]

 

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. . . .  [Designer unknown]

 

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. . .  [Andy Collinson'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 ondesign procedure inLM2651 datasheet. PCB layout is critical to reduce noise and ensure. . . .  [National Semiconductor]

 

10-Volt (1 mV) References -  File contains several designs, please scroll to find this circuit. . . .  [Analog Devices-Analog Dialogue by Gunn, Jerry]

 

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. . .  [Circuit Design 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. . .  [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. . . .  [Andy Collison's website]

 

12 Volt to 9 Volt DC Converter -  Car Converter for12 Volt to 9V. . . . 

 

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. Im posting it because one reader built a 12 volt DC to AC converte. . .  [Designed by Andrew R. Morris]

 

12v 24v AC and 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.,  03/25/12]

 

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Voltage Regulator Circuits
Voltage Regulators:  #'s-A;      B-F;      G-L;      M-Q;      R-U;      V-Z



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