This 30v variable power supply circuit is based on LM317 voltage
regulator circuit . This LM317 30v variable power supply circuit can
deliver high current (around 5 amps) and variable output voltage between
1.2 volts, up to 30 volts. The led D3 mounted on pin 6 at lm301 lights
in constant current mode .
Circuit diagram
Circuit diagram
Current limit can be adjusted using R2
potentiometer and the output voltage can be adjusted from 1.2 volts to
30 volts using R8 potentiometer . Input voltage for this variable power
supply must be around 35 volts .For this power supply circuit you need
to use LM317K circuit (in to3 package ) which must be mounted on a
heatsink .
