this Regulator circuits is
very simple variable power supply circuit can be made using this
electronic circuit diagram .This variable regulator circuit will provide
an variable regulated output voltage , between 0 and 50 volts . The
CA3140 operational amplifier compares the regulator output to a
reference voltage , that depends on the R9 value.
The output voltage will be nominally twice the voltage between the
positive input ( noninverting ) of the CA3140 and ground . The
unregulated input voltage must be around 60 volts The output voltage can
be set between 0 an 50 volts using R9 potentiometer .The 2N3055
transistors must be mounted on a heatsink , to prevent the overheating
of transistors .
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