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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