Adjustable 20V Supply Circuit

Posted on Jul 24, 2012

This circuit, can deliver 3 A or more and a maximum dc voltage ol` a little over 20 V. It is designed around the readily available LM317T adjustable 3-terminal regulator and has a pnp power transistor to boost the current output. The transformer has an 18-V secondary rated at, 6 A; this feeds to bridge rectifier and two 4700- capacitors to yield around 25 Vdc.

Adjustable 20V Supply Circuit
Click here to download the full size of the above Circuit.

This voltage is fed to the emitter of the MJ2955 transistor and to the input of the LM317 via a 33-Ohm resistor.

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