Alt-BEAM Archive
Message #00763
To: beam@corp.sgi.com
From: Justin jaf60@student.canterbury.ac.nz
Date: Tue, 23 Feb 1999 00:03:46 +1300
Subject: [alt-beam] Re: It works, but I don't know how... new diagram
> The designer's own explanation always helps! Ofcourse the pulse generator
> itself consumes power since it also operates in the linear region part of
> the time. Anyway I tried the sensor latch with the 3 diodes to the V+ and it
> seems to work quite well.
> Strangely, the resistor to ground is quite critical: 51K worked great but
> 100K not at all. Also saved one diode which should work in your circuit as
> well. See attached GIF.
I like it. The extra bonus is that in addition to fewer components, I
was able to ditch the 245 and move down to a 14-pin package with only 6
inverters. (I'm planning on trying to make the photovore quite small, so
this is significant :-)
Thanks again.
Your body-count is now one transistor, one cap, three resistors, two
diodes, and six IC pins (4 inverters), and as far as my meter can tell,
the circuit performs every bit as well despite these casualties :-)
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