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
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Posted in: Power Supply
