Subject:
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(no subject)
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 6 Jun 1996 02:02:29 GMT
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Original-From:
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System User <lylehaze@nSTOPSPAMMERS-jcenter.com>
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Reply-To:
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Lyle Hazelwood <lylehaze@n-jcenter.^antispam^com>
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Viewed:
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1505 times
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I'm having a little truoble with the H-Bridge described in this mailgroup.
I have MOST of the circuit OK.. The power bridge itself, Diodes, etc..
I am also OK with the optocouplers to 2n2907s.. I am just a bit confused
with the description if the 2907 Emitter and collector to the H-Bridge.
> Now connect the emitter of one 2N2907 to the base of Q1, connect
> the emitter of the 2907 to a 180 ohm resistor and then connect
> the resistor to the base input of Q4. Do the same thing with....
I am OK with connecting the emitter to two places, but there is no mention
of where the collector goes.. I would assume that base Q3 OR Q4 needs to
go LOW to conduct.. That might look like..
connect the emitter of one 2907 to ground, connect a 180 ohm from the
collector to base of Q4...
This is a guess, and still leaves me without Q1 and Q2 base connections,
I am not sure of the PNP triggers, though. Before I get
a RTFM, I Have read the entire handyboardmail.txt, and must have missed the
"good part" about this.. Thanx for any help!
8^) Lyle Hazelwood<lylehaze@n-jcenter.com>
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