Hi, I have a slight problem I have traced down to a transistor not turning off fully. It is a 2n3906. I control two 'common cathode RGB led' cathodes with a 2n3904 and 2n3906, the base resistors go to the same digital pin. Effectively when HIGH, the 3904 side is active, LOW the 3906. I have tried …

Transistor not fully turning off.

SurferTim September 26, 2012, 12:26pm 6

Are you certain you do not have the PNP connected reverse polarity? Emitter to power, collector to load.
http://www.fairchildsemi.com/ds/2N/2N3906.pdf

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