- Wed Mar 11, 2015 1:02 pm
#180380
I have a countdown timer and want to drive a large 4 digit display. I tried using a NPN transistor for the display driver but I have to put the load from positive to the emitter. I want to put the load from the digit collector to a segment selector (NPN transistor). This does not work and I can't figure out why. I will send a pdf of the drawing if you email me at brobinson@kos.net