Alt-BEAM Archive

Message #03143



To: "'Nigel Joyce'" nigel.joyce@qr.com.au, BEAM Mail beam@corp.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Mon, 10 May 1999 12:25:34 -0700
Subject: [alt-beam] Re: My Pagerbot


I don't know what the value of the pot is or what photodiodes (PD) you =
use
but try this: place the PDs reverse biased in parallel with the =
switches.
This means the cathode (stripe) is facing up. Depending on the =
sensitivity
of the PD, this should work quite well.

enjoy

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493=20
fax: (604)590-3411

> -----Original Message-----
> From: Nigel Joyce [SMTP:nigel.joyce@qr.com.au]
> Sent: Sunday, May 09, 1999 9:55 PM
> To: BEAM Mail
> Subject: Re: My Pagerbot
>=20
> OK Guy's=20
> Here's the problem,=A0 I have to use a FLED photopopper circuit =
because of
> the shortage of 1381's in this part of the world };-)=A0=A0 the 1 I =
used looks
> like this.
> =A0
> << File: FLEDPV.gif >>=20
> In the picture from my previous post on this thread, you see the =
solar
> panel, it is from a calculator and produces about 2.3v.=A0 now the =
FLED
> won't fire at that voltage or=A0the charge rate is too slow to fire
> the=A0FLED, combined with that is the "eyes" (in the above pic, =
the=A0eyes are
> next to the pot),=A0 which are in series with the FLED raising the =
total
> threshold voltage to about 3.1v (about 2.4v for the FLED + about 0.7v =
for
> the=A0IR Detecting Diodes)=A0 Now=A0as you can see that won't work =
because the
> solar panel never reaches that high.=A0 Is there any way I can Lower =
the
> threshold voltage to about a total of 2.0v ?=A0
> Note:=A0 I may not have the jargon right, but I know what I mean };-)
> Thanks and
> Blue Skies
> ---Buzz---
> =A0

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