>-----Original Message-----
>From: Matthew Brush [mailto:matthewbrush@YAHOO.CA]
>Sent: 19 May 2004 13:34
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE:] Transistor Problem
>
>
>Don't laugh, but is that true.  Can you make a basic
>transistor with 2 diodes?  It makes sense, I guess I just
>never thought about it.  I'm gonna try that on my breadboard.

No.  The structure of a transistor looks like two diodes when you use a
multimeter to test it, but it's operation relies on different levels of
doping in the Emiiter, Base and Collector regions. (I can remember having
the same idea and trying this when I was starting to get interested in
electronics at about 12 YO!).

>
>I had one of those exact same continuity tetsers but I hacked
>it apart to make a logic probe.  Soon I'll re-hack it to make
>a better PIC based logic tester.
>
>MJ Brush

A PIC isn't the ideal device to use for a logic tester if you are ever
likely to want to test for any high speed signals rather than static levels.
Discrete logic parts combined with a monostable for pulse stretching is a
better bet IMO.

Regards

Mike




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