Current limiter with PNP transistor

253

05:01:24

Used for limiting current output of positive voltage PSU. Very simple, two diodes in series provide fixed voltage difference for base-emitter diode and adjusting resistor. By lowering output load, current through adjusting resistor increases and when voltage on adjusting resistor and base-emitter equals voltage on diodes in series, current via adjusting resistor (÷output current) cannot increase anymore. With max. output current, voltage drop from PSU to output maybe asi high as 1 V, probably not suitable for low voltage PSU.

published 10 years ago

yashgumaste

10 years ago

You could add a switch at output which will demo a short circuit

Jizzer

10 years ago

Good idea, done. Thanks

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