Alt-BEAM Archive
Message #02512
To: beam@corp.sgi.com
From: Steven Bolt sbolt@xs4all.nl
Date: Tue, 20 Apr 1999 13:31:27 +0200 (CEST)
Subject: [alt-beam] Re: component identifcation and SE Comparison
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On Sun, 19 Apr 1992 davidperry@mail.geocities.com wrote:
> the 3904 is available from dick smith but the 3906 isn't, you can
> replace it with a BC559, i did and mine works fine, but plese note
> that the pin out is different, they are collecter-base-emitter (pins
> down, facing flat side) while the 3904 is Emitter-base-collector you
> just have to but the BC 559 in backwards.
Maybe the attached drawing helps clarify the pinouts.
Best,
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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2513 Tue, 20 Apr 1999 10:49:03 +1000 [alt-beam] Photopopper Redundancy "BEAM Mail" "Nigel Joyce" > With regards to the standard solarbotics photopopper circuit, Isn't there
a
> bit of redundancy there? I mean, all it is 2 SE's that are biased so the
1
> receiving less light fires first right?
>
> Wouldn't it be simpler to have just 1 SE and then have some sort of simple
> circuit to decide which side gets the current. Is there any sort of chip
> that flips a switch depending on which input has a larger/smaller
> resistance?
>
> I am new to this so I still don't understand what is possible and what is
> not possible. I guess it's the programmer in me trying to remove the
> redundancy.
> Blue Skies
> ---Buzz---
>
> I didn't just kiss death, I slipped it the tongue!
>
> nigel.joyce@usa.net
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