Alt-BEAM Archive

Message #03032



To: beam@corp.sgi.com
From: Wouter Brok w.j.m.brok@stud.tue.nl
Date: Thu, 06 May 1999 10:20:13 +0200
Subject: [alt-beam] Re: my beam snake...


Hello again, David,

I had a look at beam-online for the circuit of a photopopper and I think it
is possible to connect a H-bridge like I suggested. The only thing you
should be aware of is that in the photopopper-circuit both motors will be
'on' simultaneously, which isn't good for the addition I sugested, so you
should make something up for that, which I'm sure you can with your
experience of the photopopper.

A little commercial: I suggest you use the anti-smoke-h-bridge I introduced
a while back, so that you don't get trouble with both h-bridge-inputs being
high at the same time; the circuit will choose the direction of the input
which became high first.

Off course you can also use the other variant of H-bridges, like the
4-transistor one with a schmitt-inverter (74x14) or the one with a 74x139.

Wouter Brok


PS: I don't know if this will work with solar-power (didn't do much with
that yet, so I've not much experience with itt)



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