Alt-BEAM Archive
Message #04409
To: beam@sgiblab.sgi.com
From: Sean Rigter rigter@cafe.net
Date: Wed, 09 Jun 1999 18:48:54 -0700
Subject: [alt-beam] Re: SE questions not found in the FAQ.
Hi Steve,
I should have pointed out the need to tie pins 1 and 19 to gnd. Also
since there are no pins shown on the Power Smart Head schematic use pins
2,4,6 and 8 for inputs and pins 18,16,14 and 12 for corresponding
outputs. Also tie input pins 17,15,13,11 to ground if you are not going
to use the second half of the 240 chip. From now on I will add pin
numbers to my schematics and try to convert as many as I can to layout
drawings.
regards
wilf
Bumper314@aol.com wrote:
> > The power Smart Head, D2, Low Drop Out regulator, etc.,
> > and many more, would be a great resource for new and old alike.
> > Jim
> I agree. Wilf contributes greatly to this list, but on a more advanced level.
> Now I can usually pick these schematics of his apart but then again it took
> me a few hours to get a good picure of the inverters in a 74XX240. Which
> brings up this question. When one row of inverters is enabled, do you have to
> use them all? I tried to make his power smart head, but the chip just ended
> up burning my finger and the motor never moved =).
>
> STeve
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