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kentken said:I am driving a CA 2.25 display that runs on 8v and sinked with a ULN2003.
What is the best way to use PNP transistors on two PortA pins to drive the display?
kentken said:I tryed that before, and it didnt work right. I will try it again.
When the base gets pulled to 8v, will this efect the Pic pin? If so, what can I do to protect it?
kentken said:Hi again Nigel, I've been moving, so no time to play.
I Hooked it up like your tut with one transistor working off the other, and hooked to RA4. The ony thing is that the supplies to each of the digits are different, the sencond tranistor is lower voltage and amp.
Could I hook each transistor to a seperate pin and pull the base up to the 8v, with out hurting the Pic.
What resistor should be used between the Pic and Transistor?
Another idea is to drive each digit seperate. Hooking the segments to seperate ports in the pic, and direct power to the displays, sink through the pic. Work? Problems?
Thanks for the Help
Kent