Alt-BEAM Archive

Message #09658



To: beam@sgiblab.sgi.com
From: Dave Hrynkiw dave@solarbotics.com
Date: Mon, 31 Jan 2000 14:23:49 -0700
Subject: [alt-beam] Re: Audio Amp.....


At 01:57 AM 1/31/00 , Dane Gardner wrote:
>I've been pouring over all my books here in my personal library and can't
>find an uncomplicated audio amp. I know that they exist. I used to play
>with them when I was a kid. I've been wanting to add a little bit of
>noise to one of my robots, and I've got the oscilation circuit, but it
>doesn't have enough oomph to get the noise level I want. Something simple
>would be great. I remember something about a 741 op amp, but I can't find
>any schematics, or data sheets on the net. Any help would be greatly
>appreciated.


I got used to using the LM386 audio op-amp in the "Herbie" circuit. Very
nice, and simple too. Take a boo at it. Even radio shack carries it.

-Dave

---------------------------------------------------------------
"Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
2 vowels. Pronounciation? _SMITH_".
http://www.solarbotics.com



9659 Mon, 31 Jan 2000 13:27:55 -0800 [alt-beam] Re: Flux cleaning (was: Bicore question) beam@sgiblab.sgi.com Bruce Robinson "John A. deVries II" wrote:
>
> At 12:17 PM 1/31/00 , Bruce Robinsonwrote:
>> Water soluble fluxes are the most common culprits, and they
>> wash off (obviously) with water. I haven't used this type
>> of flux, but I suspect a damp sponge would be your best bet.

> Actually, running it through the dishwasher (presuming no
> water-damageable parts) works very nicely. The problem
> with using a sponge is that the end of components and wires
> sticking through the PCB tend to tear the sponge to shreds.
> I believe I've seen Tilden use a toothbrush on occasion.

The thought of immersing one of my circuits in any kind of fluid scares
the heck out of me :) Yes, those wire bits are a pain -- I try to cut
them off as close to the board as possible (after soldering). I
suggested a sponge because it doesn't have a bunch of fibres to tear
loose. I definitely like the toothbrush idea.

Regards,
Bruce



9660 Mon, 31 Jan 2000 16:43:44 EST [alt-beam] Pager Motor Wieght/Eccentric beam@sgiblab.sgi.com BUDSCOTT@aol.com I've got some nifty little pager motors from MPJA, that have the small half
cylinder eccentric on them, unfortunately, it looks as if they've been quite
well affixed with sodler? Anyway, I've heard at least two different methods
of removing the wieght, but neither of which seem to be a proper enough or
sufficient enough of a method of removing this wieght. Any methods that you
can think of or have heard of that just might work with out have a risk of
damaging the shaft would be well appriciated.

Thanks!



9661 Mon, 31 Jan 2000 14:50:36 -0700 (MST) [alt-beam] Re: Flux cleaning (was: Bicore question) beam@sgiblab.sgi.com harsh@lanl.gov
On 31-Jan-00 Bruce Robinson wrote:



>> loose. I definitely like the toothbrush idea.
>

An "acid" brush with the brisles cut to about 1/4 to 3/8 inch works well too.



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