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A type of bipolar transistor comprised of p-type semiconductor in contact with n-type semiconductor which in turn is in contact with a p-type semiconductor -> thus PNP. The transistor has three terminals, the Emitter, Base and the Collector. Current injected into the base controls the flow of current from Emitter to Collector enabling amplification and switching.

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Resistor for open-collector transistor

I have an encoder; the circuit is in the image below: The one that I’m interested in is the PNP one. I want to use a 0-5 V digital voltage, the datasheet says this: Applied voltage: 30 VDC max. …
Sergio Piccione's user avatar