piclist 1999\06\10\210646a >
Thread: multiplexing 7-seg LEDs
www.piclist.com/techref/displays.htm?key=leds
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face BY : Jonathan Newport email (remove spam text)

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<DIV><FONT color=#000000 size=2>&nbsp;&nbsp;&nbsp; <FONT color=#000000>I'm
trying to multiplex 3 seven segment LED displays and I have the lookup table and
one digit working.&nbsp; However, I'm ashamed to say this, but I don't really
know how the transistors work to switch between digits.&nbsp; They are common
anode displays and I have 2N2222 NPN transistors, I also have some 2N4403 PNP
transistors, actually, I have more of the latter...&nbsp; I was simply trying to
send the 2N2222 a logic one at the base and then hoping that it would cause
current to flow from collector to emmiter...I fooled around with resistors for a
little bit, but I had no luck....could someone help?&nbsp;
Thanks.</FONT></FONT></DIV>
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<DIV><FONT color=#000000 size=2><FONT color=#000000>Jonathan
Newport</FONT></FONT></DIV>
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