AC to DC circuit diagrams

Unregulated PSU

A basic full wave rectified power supply

Variable DC Power Supply

Regulated 12 Volt Supply

A basic regulated 12 Volt power supply

Current Limiting Power Supply

This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.

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.

Increasing Regulator Current

An outboard pass transistor used to increase the current output of a voltage regulator IC.

Adjustable Power Supply with Charger Output

This power supply has adjustable and charger output. The charger circuit can be use for cellular phone. The adjustable output serves as multipurpose power supply. It can handle a 1 ampere current. The 317 must have a heat sink.

Radio Friendly Power Supply

Power supplies should not create any unwanted interference across the radio spectrum. Switch mode power supplies are one of the strongest sources of interference, and harmonics can be heard throughout long, medium and short wave bands. This power supply, is extremely noise free, and therefore radio friendly. In addition, it has a very high rejection of line frequency and is suitable for powering receivers and small power transmitters.

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.

Power Zener Circuit

In this circuit a zener diode is "amplified" by a set of power transistors. The transistors substantially increase the current and power to the load.