Stabilised Power Supply with Short-Circuit Indication

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Here is an efficient 4-stage stabilised
power supply unit for testing electronic
circuits. It provides well
regulated and stabilised output, which is
essential for most electronic circuits to give
proper results. The circuit provides an audio-
visual indication if there is a short circuit
in the PCB under test, so the power
supply to the circuit ‘under test’ can be
cut-off immediately to save the valuable
components from damage.
The circuit provides four different regulated
outputs (12V, 9V, 6V and 5V) and
an unregulated 18V output, which are selectable
through rotary switch S2.
 
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