PNP bipolar junction transistors (BJTs) make nice switches because they operate on the high side of the circuit.

But having to give it a low signal to turn it on is a bit awkward. A NPN BJT can make it so that you need a high input signal to turn the PNP BJT switch on, and a low input signal keeps the PNP BJT off.

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Video

Quick high side PNP BJT switch that turns on with high input instead of low circuit by electronzap



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