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'[EE]: H-Bridge Crowbar (was PIC reseting due to r'
2001\08\29@125105 by Lawrence Lile

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----- Original Message -----
From: "Lawrence Lile" <spam_OUTllileTakeThisOuTspamTOASTMASTER.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Wednesday, August 29, 2001 10:29 AM
Subject: H-Bridge Crowbar (was PIC reseting due to relays)


{Quote hidden}

can't
> get hosed by the read-write-modify bug.  So far so good.  But what about
> when a little glitch comes along and this thing begins to crowbar?  Maybe
I
> do want to destroy the device at that point... but let's assume I don't.
>
> It would be simple to add a little logic circuit to prevent both inputs
from
> going high at the same time.  Digikey sells a 2-input Xor gate for
US$0.35,
> two of them would do the trick.  $0.70 might sound cheap to you rocket
> scientists, but I build whole PC boards that cost less than that.   Can
> anybody think of a simple, cheap way to implement this, say using diode
> logic or a To-92 transistor?  Kind of a design challenge.
>
> What I had originally wanted was an H-Bridge that would go forward for a 1
> input, reverse for a 0 input, and do nothing for a high impedance input,
but
{Quote hidden}

frequency
> > on the choppers, which is poorly documented, and apparently none of
their
{Quote hidden}

here
> > in my signature line, but due to the inability of sysadmins at TELOCITY
to
{Quote hidden}

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