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0-30 Volt Laboratory Power Supply – Circuit Schematic
0-30 Volt Laboratory Power Supply
With reference to the schematic, lamp, LP2, is a power-on indicator. The other lamp (lower) lights when the unit reaches its preset current limit. R5, C2, and Q...
Small Variable Power Supply – Circuit Schematic
Small Variable Power Supply
R2 sets the output voltage. The maximum current is determined by the value of R3: the over-current protection circuitry inside the LM723 senses the voltage acro...
Logic PSU with Overvoltage Protection – Circuit Schematic
Logic PSU with Overvoltage Protection
The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC`s are easily ...
Basic UPS Power Supply – Circuit Schematic
Basic UPS Power Supply
This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of ...
9 Volt 2 Amp Power Supply – Circuit Schematic
9 Volt 2 Amp Power Supply
There is little to be said about this circuit. All the work is done by the regulator. The 78S09 can deliver up to 2 amps continuous output whilst maintaining a ...
Current Limiting Power Supply – Circuit Schematic
Current Limiting Power Supply
SW3 is the on/off switch. It also lets you choose between the output with the current limit and the one without. SW2 provides a selection of three different lim...
Small Variable Power Supply – Circuit Schematic
Small Variable Power Supply
Features: 1.3-12.2 V, 1 A, over-current protection. This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the...
Soft Start PSU – Circuit Schematic
Soft Start PSU
Two soft start power supplies. The output voltage slowly increases to the desired output...
Universal PSU – Circuit Schematic
Universal PSU
A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps....
An Add-on Current Limiter – Circuit Schematic
An Add-on Current Limiter
This circuit allows you to set a limit on the maximum output current available from your PSU. It`s very useful when you power-up a project for the first time - ...
1.3 Volt Power Source – Circuit Schematic
1.3 Volt Power Source
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 pane...
Variable Power Supply Using Fixed Regulator – Circuit Schematic
Variable Power Supply Using Fixed Regulator
The transformer has a 240V primary and has a secondary rated 24V at 2A. The bridge rectifier contains 4 diodes, their current rating needs to be high with respe...
12 Volt 30 Amp PSU – Circuit Schematic
12 Volt 30 Amp PSU
The input transformer is likely to be the most expensive part of the entire project. As an alternative, a couple of 12 Volt car batteries could be used. The inp...
3-30 V/2.5 A Stabilized power supply – Circuit Schematic
3-30 V/2.5 A Stabilized power supply
This is a very useful project for anyone working in electronics. It is a versatile power supply that will solve most of the supply problems arising in the every...
13.8V 20A power supply – Circuit Schematic
13.8V 20A power supply
This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13.8V. For lower currents, a separate curre...
10 Amp 13.8 Volt Power Supply – Circuit Schematic
10 Amp 13.8 Volt Power Supply
Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers. The advantage to...
5V/1A Power Supply – Circuit Schematic
5V/1A Power Supply
Tendency of entry: 220V AC. Tendency of expense: 5V DC. Current of expense: 1A...
High Current Power Supply – Circuit Schematic
High Current Power Supply
Since my page was first posted, I have received a number of emails asking about a high current power supply. I looked around, but couldn`t find one that was sui...
Fixed Voltage Power Supply – Circuit Schematic
Fixed Voltage Power Supply
The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage it ...
Dual Polarity Power Supply – Circuit Schematic
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 ot...