Alt-BEAM Archive
Message #02511
To: beam@corp.sgi.com
From: davidperry@mail.geocities.com
Date: Sun, 19 Apr 1992 18:58:22 +0000
Subject: [alt-beam] Re: component identifcation and SE Comparison
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. You can't get the 1381, i
even called pansonic and they'd never heard of it. You'll have to
order it from solarbotics or digi-key
David Perry
> From: "Nigel Joyce"
> To: "BEAM Mail"
> Subject: Re: component identifcation and SE Comparison
> Date: Thu, 15 Apr 1999 09:52:41 +1000
> Organization: Queensland Rail
> Reply-to: "Nigel Joyce"
> Thanks Kyle for the info, I was hoping for a bit more about this bit here
> from the rest of the board.
>
> > > I just got my first electronics catalogue from
> > > dick smith electronics, (our local electronics store, also stocks the
> > > cybug and higher function add-ons) and I cannot find the 1381's or the
> > > 3906's in it, the 3904's are there as well as a heap of other stuff
> > > but as I am new to this stuff, are there other names these components
> > > are known as?
>
> Is there equivalent transistors for the
> a. 3906 PNP's = = ?
> b. 3904 NPN's = 2n2222 ? = ?
> c. 1381 Voltage Detectors = ?
>
>
> Has there been a discussion previously on the advantages/disadvantages of
> each of the SE's?
> I got a couple of the LM3909's from the shop, Yet to build SE's from them
> though,
>
> I don't understand why they aren't used more, they seem very simple to me,
> and perhaps smaller? easier to tune?
>
> 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
>
> > > Hey everyone,
> > > I just got my first electronics catalogue from
> > > dick smith electronics, (our local electronics store, also stocks the
> > > cybug and higher function add-ons) and I cannot find the 1381's or the
> > > 3906's in it, the 3904's are there as well as a heap of other stuff
> > > but as I am new to this stuff, are there other names these components
> > > are known as?
> >
> >
> > Hmm, don't know about this. They probably don't carry the 1381 though,
> > you'll most likely have to get it from DigiKey.
> >
> >
> > > Also, I have sofar pulled apart 1 old computer, 1 old video player,
> > > about 20 old pagers (16 great motors) and a bunch of other old
> > > electronics that had been collecting dust under the house (I knew
> > > there was a reason I didn't chuck it all out). anyway, I have a bunch
> > > of IC's that are marked with 74****** something, something. I was
> > > wondering which ones of these are handy for BEAM?
> >
> > These are useful:
> > 74**14 - Microcore
> > 74**245 - Microcore
> > 74**00 - Suneater 2,3
> > 74**02 - Suneater 3
> >
> > ** = hc, als, hct, etc.... Soem are better than others, check the
> > schematics.
> > Info on the Suneaters series (They're great) can be found on Steven
> > Bolt's (He's cool) site:
> > http://www.xs4all.nl/~sbolt/e-index.html
> >
> > It's on there somewhere....
> >
> > > Also, I pulled apart a mouse that was stuffed, what do the led's in
> > > them detect, and emit? is it IR?
> >
> > >From what I know, yes.
> >
> > > On another note, I am building my first photopopper in the case of 1
> > > of the pagers as a tribute to the source of these great motors. A
> > > calculator solar panel will fit perfectly where the LCD screen was. so
> > > the only visible parts will be the motor shafts and the holes where
> > > the eyes get the light. What sort of Voltage and Current can I expect
> > > from a calculator solar cell? I've read that a 1381 SE needs about
> > > 3v, is there a SE design that uses less?
> >
> > I only use calcuslator cells cause that's all I can get. They're great,
> > usually put out about 2.8 volts. I use FLED SE's because they trigger at
> > around 2.1v, but aren't as effecient as the 1381's. You can get 1381's
> > that will trigger at 2.1v, so yes, you can use your cells with a 1381
> > SE.
> > Adios,
> > Kyle
> >
> > -
> > "If you can..."
>
>
____________________________________________
I'm sure David sinceraly apologises if he
insulted anyone, it won't happen again.
____________________________________________
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