Here is very Simple build power supply Electronic Circuit Project of 15-V 1-A Regulated Power Supply circuit. The
supply receives - 20 V from the rectifier/filter which is fed to the
collector of the Darlington pnp pass transistor, a TIP105. The base
drive to the TIP105 is supplied through resistor R5. The base of the
TIP105 is driven from Vz terminal at pin 9, which is the anode of a
6.2-V zener diode that connects to the emitter of the uA723 output
control transistor.
15-V 1-A Regulated Power Supply Circuit Diagram:
The
method of providing the positive feedback required for fold back action
is shown. This technique introduces positive feedback by increased
current flow through resistors R1 and R2 under short-circuit conditions.
This forward biases the base-emitter junction of the 2N2907 sensing
transistor, which reduces base drive to the TIP105.
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