Alt-BEAM Archive
Message #04154
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Wed, 2 Jun 1999 00:43:57 -0700
Subject: [alt-beam] Re: Bicore, not wasting energy
The two parallel outputs are true Nv neurons (not Bicores). The problem with
this circuit is that the output pulse width becomes progressively narrower
as the light level increases reducing output dutycycle to approach zero.
regards
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411
> -----Original Message-----
> From: Hitchcock, Ben BE [SMTP:Hitchcock.Ben.BE@bhp.com.au]
> Sent: Tuesday, June 01, 1999 7:09 PM
> To: 'beam@spindle.corp.sgi.com'
> Subject: Re: Bicore, not wasting energy
>
> Try this circuit. The pulse generator is only to make pulses for the two
> 'bicore' neurons, both of which operate in parallel with each other.
>
> I have drawn diodes reverse-biased across the resistors to indicate
> photodiodes, but I don't know if they work like this. Anyway, the
> implementation is up to the builder. Basically you need a biasing
> resistance that changes with varying levels of light.
>
> So when the pulse generator ouputs a high, both inverters go low, but the
> one that has a lower resistance in the input goes high first, which makes
> the motor spin around.
>
> Then the other neuron goes high, and the motor stops.
>
> Cheers,
> Ben <>
>
> EOM
>
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> mailto:postmaster@bhp.com.au. << File: Bicore.bmp >>
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