Alt-BEAM Archive
Message #11872
To: beam@sgiblab.sgi.com
From: Andrew Hooper andrew@best.net.nz
Date: Wed, 15 Mar 2000 17:44:28 +0800
Subject: Re: H-Bridge
> Thanks Dave,
>
> Im using BC327's and BC337's as they are easy to get
> and cheap, the 2n2222 and 3904's are avalibe at about
> three times the price and the place i shop dont stock the
> complament :(.
>
> I found the problem with using 4 transistor h bridges, either
> you end up with a 0,0=smoke or a 1,1=smoke :(
>
> looks like a 6 transistor version is next :)
>
> Once im finished im going to cast the units in resin and just
> have 6 legs sticking out, sorta a case of build your own IC
> i guess :).
>
> Regards
> Andrew
> -----Original Message-----
> From: Dave Hrynkiw
> To: beam@sgiblab.sgi.com
> Date: Tuesday, March 14, 2000 7:50 PM
> Subject: Re: H-Bridge
>
>
> >At 09:53 PM 3/13/00 , Andrew Hooper wrote:
> >>I have been looking at several H-Bridge circuts (as the Zetex chip is
not
> >>readily avalible over here)
> >>and found that there is a 6 transistor and a 4 transistor version, both
> seem
> >>to be no smoke.
> >>
> >>What are the bonuses or drawbacks of using these?
> >
> >
> >Little if no drawbacks. Although the Zetex chip is a tidy package, don't
> >let that keep you from trying your own "free-hand" H-bridge. beam-online
> >has a bit of a layout to get you started. And I FULLY recommend you use
> >2n2222 for 3904's and 2907 for 3906's, as once (quite forcefully and
> >accurately!) pointed out by Steven Bolt. Much better, for pennies more a
> >transistor.
> >
> >Regards,
> >Dave
> >
> >---------------------------------------------------------------
> >"Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
> >that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
> > 2 vowels. Pronounciation? _SMITH_".
> > http://www.solarbotics.com
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