his
bench power supply circuit is suitable for your electronic experiment lab. This circuit can be built no on a piece of copper-laminate. The Bench
Power Supply was designed to use old lantern
batteries, “D”, and “C”. This circuit can produce at least 12v -14v from old batteries
and cells. As a heat-sink, this circuit uses a board. To connect the
components, enamelled wire is used. To keep the transistor cool, it can
be bolted. Here is the
schematic diagram of the circuit:
The zener is used to regulate The output of this
power supply.
So, there is voltage approx 1.7v across a red LED and 8.2v between the
base-emitter leads of a BC547 transistor (in reverse bias). This circuit
can give 0v – 9v at 500mA depending on the life left in the cells used.
To indicate the circuit is ON, LED is used. The 10k pot is used to
adjust the
output voltage
Posted in: Power Supply
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