When the input voltage (output of the rectifier section) increases, the output voltage of the regulator (Vout) also increases. Hi KE730 in series regulators when you use it at very low voltage at max current, with high voltage input the series pass transistor will get heated up, hence you have to use a good heat sink. This is a Regulated DC power supply with short circuit protection and with current limiter.

Such transistor voltage regulators are suitable for application where high output current is required. By connecting 2.2k 3watt wire wound potentiometer in parallel with the zener diode and connecting the slider of the potentiometer to base of Q1 base will make it a simple variable bench supply, which is still in service with me. Additional series pass transistors have to be added to the 7805 based regulator circuit for improving their current capacity.

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