Alt-BEAM Archive
Message #04430
To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Sat, 12 Jun 1999 12:24:43 -0500
Subject: [alt-beam] Re: why my walker may not work...
The 4 transistor H-Bridge that Is on Walkman Jr and uses inverters from
the 74HC14??? I have used that on Walkman Jr and MECI IV M, but both
circuits had them wired to the INPUTS of the Nvs! It was a little
mistake in the PCB diagram that kept getting copied, cause I used
Walkman as a guide to maing Microcore PCBs.
It ought to work, but I've found that the 6 transistor H-bridge is very
reliable and is smaller cause it doesn't have that chip. It can also be
easily freformed! Bronco and Spyder use them. I personaly recomend the 6
Tranistor one, but if the 4 Transistor one works for you, then go ahead.
davidperry@mail.geocities.com wrote:
>
> u may remember my walker not working, so while i'm waiting for parts i decided
> to try and fix it. I think its a combination of the h-bridges the
> the motors, they require 1 amp but will run with 1 or 2 AA (about
> 600ma, 3volts). What are my options (im using rich's 4 transistor
> h-bridge), 74hc245 driver, 6 transistor h-bridge, better
> motors?
>
> David Perry
> ____________________________________________
> I'm sure David sinceraly apologises if he
> insulted anyone, it won't happen again.
>
> ____________________________________________
--
Richard Piotter
richfile@rconnect.com
The Richfiles Robotics & TI web page:
http://richfiles.calc.org
For the BEAM Robotics list:
BEAM Robotics Tek FAQ
http://people.ne.mediaone.net/bushbo/beam/FAQ.html
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