multiplexing 7-seg LEDs by Jonathan Newport .

part 0 1922 bytes <x-html><!x-stuff-for-pete base="" src="" id="0"><!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=text/html;charset=iso-8859-1 http-equiv=Content-Type> <META content='"MSHTML 4.72.3110.7"' name=GENERATOR> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#000000 size=2>    <FONT color=#000000>I'm trying to multiplex 3 seven segment LED displays and I have the lookup table and one digit working.  However, I'm ashamed to say this, but I don't really know how the transistors work to switch between digits.  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...  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?  Thanks.</FONT></FONT></DIV> <DIV><FONT color=#000000 size=2><FONT color=#000000></FONT></FONT> </DIV> <DIV><FONT color=#000000 size=2><FONT color=#000000></FONT></FONT> </DIV> <DIV><FONT color=#000000 size=2><FONT color=#000000>Jonathan Newport</FONT></FONT></DIV> <DIV><FONT color=#000000 size=2><FONT color=#000000></FONT></FONT> </DIV> <DIV><FONT color=#000000 size=2><FONT color=#000000></FONT></FONT> </DIV> <DIV><FONT color=#000000 size=2><FONT color=#000000> </FONT></FONT></DIV></BODY></HTML> </x-html>