True. The base-emitter voltage of an NPN will be about +0.7 volts when the transistor is on. For a PNP, the base-emitter voltage will be approximately -0.7v when it is on. In Bogito's original post, he specifically said "excluding the polarity", so I didn't mention it.rookie said:npn can be switced with only a +signal, pnp -signal..m i true ere?
Oooops sorry Ron,so it is the qualityRon H said: