AC to DC circuit diagrams

Variable PSU 3-15v

A variable power supply with adjustable voltage and current outputs made with the L200 regulator.

Variable Power Supply Using Fixed Regulator

This is a similar power supply that I used to power my FM Transmitter. After suffering long problems with mains hum, this design using a pi filtered C-L-C approach. This circuit offers excellent ripple rejection.

The Output Adjustable Flyback Converter

A high voltage step-up DC power supply using adjustable flyback conversion.

1.5 to 37 Volt 30 Amp Power Supply

A modification to the 12V 30 Amp power supply. This version uses an LM317 to provide a variable 1.5 to 37 Volt regulated output with currents up to 30 Amps. Max has built his power supply into an old computer case and can be seen on YouTube under Project Icarus.

Dual Regulated PSU

In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply.

Gyrator Circuit

An electronic recitification circuit. The use of large, heavy and expensive electrolytic capacitors is avoided, being replaced by an active transistor in this gyrator circuit.

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 LM723.

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.

Regulated DC power supply

This is a Regulated DC power supply with short circuit protection and with current limiter.

Transformerless Power Supply

I have had several requests for a power supply project without using a power supply. This can save the expense of buying a transformer, but presents potentially lethal voltages at the output terminals.Under no circumstances should a beginner attempt to build such a project.