Free circuit schematics - wiparat.com

Here is an efficient 4-stage stabilized power supply unit for testing electronic circuits. It provides well regulated and stabilized output, which is essential for most electronic circuits to give proper results. The circuit provides an audio- visual indication if there is a short circuit in the PCB under test, so the power supply to the [...]

Transistors types have been altered to ones that are more readily available. [...]
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5 volt High Current Regulated Supply with LM317
High Current LM317 Regulated Power Supply
LM317, LM338, LM350 CURRENT REGULATOR CALCULATOR

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 other circuits that require a dual supply voltage. [...]
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