Alt-BEAM Archive
Message #02342
To: "Wilf Rigter" Wilf.Rigter@powertech.bc.ca,
From: "Nigel Joyce" nigel.joyce@qr.com.au
Date: Thu, 15 Apr 1999 14:03:02 +1000
Subject: [alt-beam] Re: component identifcation and SE Comparison
Thanks Wilf,
I was going to use a 1000uF cap for the timing cap on
the LM3909 circuit and a 4700uF cap for storage. Sound right?
With the NPN, PNP transistors, I am looking for a good combination that will
power a photopopper off a calculator solar panel, as these don't give out
much current (I think) and it will fit in the screen area of the pager, and
I cannot locate 1381 components here in Australia.(yet)
Can LM3909 SE's be used in photopoppers? How would you wire up the eyes?
[snip from below]
> > >
> > > > 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.
thanks &
Blue Skies
---Buzz---
> An LM3909 SE would work ok although it needs quite a bit of current. Want
me
> to design one for you?
> 2N3906 is a PNP small signal transistor, almost any other small signal
PNP
> is the same. As a rule for SE appliactions you need sensitive devices so
> look for HFE 100-300 at 10mA (for low current apps) For a little higher
> current use a 2N2907A PNP transistor and it's equivalent NPN, the
2N2222A.
>
> enjoy
>
> Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> tel: (604)590-7493
> fax: (604)590-3411
>
> > -----Original Message-----
> > From: Nigel Joyce [SMTP:nigel.joyce@qr.com.au]
> > Sent: Wednesday, April 14, 1999 4:53 PM
> > To: BEAM Mail
> > Subject: Re: component identifcation and SE Comparison
> >
> > 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..."
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