Alt-BEAM Archive
Message #05222
To: beam@sgiblab.sgi.com
From: Steven Bolt sbolt@xs4all.nl
Date: Sat, 10 Jul 1999 11:03:08 +0200 (CEST)
Subject: [alt-beam] Re: Something funny with the 1382 voltage triggers?
On Fri, 9 Jul 1999, Terry Newton wrote:
> Could be SM 1381's don't like having their low output being
> pulled high by something else, that's not exactly something
> you want to do with output stages. If you try that with any
> kind of power you'll likely get smoke or other flakiness.
The typical 2-transistor latch/driver wastes about 4mA max. when
pulling an active low 1381 output to the about 0.7 allowed by the
base-emitter diode of the driver transistor. Imho not enough to do
damage, and not very significant in terms of efficiency, for this
circuit...
> If that's the problem then maybe just a single resistor,
---8<---
> A 1N914 in series with the 1381 output (anode to 1381, cathode
---8<---
With all those resistors and diodes being added by Wilf, Bob and
you, the component count is about what you need for a proper latch
and driver :)
Best,
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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