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A short circuit protection is a current-limiting with foldback type. Foldback is desirable since the short circuit power dissipation of the series-pass transistor Q1 can be limited, preventing damage to it. The emitter of Q2 is connected to the output which effectively reverse biases transistor...
Transistor Q1 is the series-pass transistor;Q3 is a darlington configuration. This improves the response of Q1 with respect to the error signal. Transistor Q4 acts as a comparator or a differential voltage amplifier. D2 and D3 are silicon diodes in forward biased connection. Q4 and R4 supply...
Here's what you want a transistorized regulated power supply.
I'll post soon the parts list if this circuit helps.
note: voltage display (error) reverse the switch.
voltage display corresponding in voltage divider.
There's no problem in your power supply. All gray in your power supply are all electrolytic capacitor. The 1m resistor is to discharge the capacitor when not in use. There are no ground in your power supply it's a floating ground. Use B- and B+ to your project.
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