Alt-BEAM Archive

Message #03120



To: "BEAM Mail" beam@corp.sgi.com
From: "Nigel Joyce" nigel.joyce@qr.com.au
Date: Mon, 10 May 1999 14:54:57 +1000
Subject: [alt-beam] Re: My Pagerbot



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OK Guy's =

Here's the problem, I have to use a FLED photopopper circuit because of th=
e shortage of 1381's in this part of the world };-) the 1 I used looks li=
ke this.


In the picture from my previous post on this thread, you see the solar pane=
l, it is from a calculator and produces about 2.3v. now the FLED won't fir=
e at that voltage or the charge rate is too slow to fire the FLED, combined=
with that is the "eyes" (in the above pic, the eyes are next to the pot), =
which are in series with the FLED raising the total threshold voltage to a=
bout 3.1v (about 2.4v for the FLED + about 0.7v for the IR Detecting Diodes=
) Now as you can see that won't work because the solar panel never reaches=
that high. Is there any way I can Lower the threshold voltage to about a =
total of 2.0v ? =

Note: I may not have the jargon right, but I know what I mean };-)
Thanks and
Blue Skies
---Buzz---



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>

src=3D"cid:025401be9aa1$40d3d830$8d3e580a@qrail.com.au">
In the picture from my previous post on this thread, yo=
u see =

the solar panel, it is from a calculator and produces about 2.3v T =

size=3D2>.  now the FLED won't fire at that voltage or the charge=
rate =

is too slow to fire the FLED, combined with that is the "eyes" (in the=
=

above pic, the eyes are next to the pot),  which are in series wi=
th =

the FLED raising the total threshold voltage to about 3.1v (about 2.4v for =
the =

FLED + about 0.7v for the IR Detecting Diodes)  Now as you c=
an =

see that won't work because the solar panel never reaches that high.  =
Is =

there any way I can Lower the threshold voltage to about a total of 2.0v =

? 

Note:  I may not have the jargon right, but I know=
what I =

mean };-)

Thanks and

Blue Skies
---Buzz---

 





eGroup home: http://www.e=">http://www.eGroups.com/group/alt-beam">http://www.e=
Groups.com/group/alt-beam

www.eGroups.com">http://www.eGroups.com">www.eGroups.com - Simplifying group =
communications





Attachment: FLEDPV.gif

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