Adjustable 20V Supply Circuit

  
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 - schematic

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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