Alt-BEAM Archive

Message #02775



To: "'Chiu-Yuan Fang'" chiumanfu@home.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Thu, 29 Apr 1999 17:38:09 -0700
Subject: [alt-beam] Re: Bicore head targeting?


Hi Chiu,

That's why there is a 1F supercap. The voltage is supposed to vary between
Vt+ and Vt- of the 1381. (Something I picked up from Bolt, I think). However
what you suggest is a good idea for smaller storage caps and easy to do by
increasing the 1381 hysteresis 8^).

I'll be back!

regards

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411

> -----Original Message-----
> From: Chiu-Yuan Fang [SMTP:chiumanfu@home.com]
> Sent: Thursday, April 29, 1999 4:44 PM
> To: Wilf Rigter
> Cc: Dennison; beam@corp.sgi.com
> Subject: Re: Bicore head targeting?
>
> The way it is set up now, the motor(s) will run while the 1381 outputs a
> high.
> But it will reset as soon as the voltage falls by 300mV (max. hysteresis
> of the
> 1381). You need to add a timed or voltage controlled latch.
>
> Chiu
>
> Wilf Rigter wrote:
> >
> > Well there is certainly a lot of cross-fertilization of BEAM genes going
> on!
> >
> > And so I make my contribution here: the PHOTO-PHASER.
> >
> > It's designed with HEAD and POPPER genes with liberal dose of THUMB
> genes
> > thrown in to keep the power way down. It can be used as a POPPER type
> > circuit by adding 2 motors (reverser coming up ) and with just one motor
> > makes a fine HEAD circuit (zero power deadband coming up). As usual I
> have
> > not yet tested this circuit but if anyone wants to beat me to it ..... I
> am
> > sure it will work and should have outstanding micro power performance.
> > Anyone care to comment on the obvious reason for the title (heheh!).
> >
> > enjoy
> >
> > Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> > tel: (604)590-7493
> > fax: (604)590-3411
> > <>
> >
> >
> --------------------------------------------------------------------------
> ------
> > Name: PHASER.gif
> > PHASER.gif Type: GIF Image (image/gif)
> > Encoding: base64
>
> --
> Chiu-Yuan Fang
> chiumanfu@home.com
> ICQ=5614919
> http://www.geocities.com/SouthBeach/6897/beam2.html

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