Alt-BEAM Archive
Message #06793
To: beam@sgiblab.sgi.com
From: Evan Dudzik evandude@yahoo.com
Date: Sat, 16 Oct 1999 18:14:29 -0700 (PDT)
Subject: [alt-beam] check out photovore online!
i added a couple really kool tutorials, i know its not
too much, but it is kool.
http://surf.to/photovore
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6794 Sunday, 17 October 1999 6:39 Quasi uCore 'beam@sgiblab.sgi.com' Wilf Rigter
>
>Hello again,
>
>Here's another bit of circuit magic, this time a microcore design including
>motor drivers that uses only non-inverting buffers like the AC/HC 245, 241
>or 244 chips. The Quasi uCore (QuCore) is the first microcore design that
>does not require a 74xx14 or equal Schmitt trigger. When used with the AC
>version, it can directly drive a BG micro type gear motor, which provides
in
>a single chip, the "almost complete" microcore 2 motor / 4 legged walker.
>
>The secret is the use of non-inverting buffers with feedback capacitors to
>simulate Schmitt triggers. Like it's microcore predecessor, this circuit
>will saturate and for now requires manual pulse neutralizing to start a
>single process by grounding one of the pull-up resistors at one of the
>QuCore stage inputs. Like a microcore, the pulses are non-overlapping. This
>is very useful for controlling a 2 motor 4 legged walker but also the two
>motors of a single leg of a hexapod which require the typical leg motion of
>UP, FORWARDS, DOWN, BACKWARDS. Like the microcore, the duration of each
>pulse can be independently adjusted. Unlike the microcore, two stages use
>ground and two stages use +V as reference for their input resistors. Also
>unlike the micro core one output pair is active low and one pair is active
>high. Anyway it is a unique design and may yet play a role in the evolution
>of beam bots.
>
>enjoy
>
> Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> <>
>
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