My understanding is that I need to use a PNP transistor for high side switching. So far i have tried three different ones (PN2907A, BC327, and 2N4403) with the same result which tells me I have missed something important. I am using a 12 volt power supply to power a .15 amp dc motor. I connect the c…

Correct use of pnp transistors

MarkT October 22, 2012, 11:03pm 7

That makes sense now, 1.44W would get a normal 1/4 W resistor to burn up... P = V^2/R

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