Alt-BEAM Archive
Message #11019
To: beam@sgiblab.sgi.com
From: "Leonardo Boulton F." L.Boulton@rocketmail.com
Date: Mon, 28 Feb 2000 10:08:56 -0800 (PST)
Subject: [alt-beam] Re: Schematics
--- Flaming Headphones wrote:
On a schematic, which of the leads is the emitter and which is
> the
> collector? The base is pretty obvious, and I thought that the other 2
> were as well, but I was wrong. Here's how I'm reading it right now:
> If
> the arrow is pointing in, like on the 3906, it's the collector. If
> it's
> pointing out, like on the 3904, it's the emitter. Is that correct?
> This
> is really weird, because when I boarded it reading this way, I got
> the
> 3904s right but the 3906's wrong.... So I'm afraid to start soldering
> until I get it sorted out.
>
> TIA,
> Mike, AKA Flaming Headphones
On a schematics, the emitter is the one with the arrow (on PNP, and
NPN: both). What yo should be carefull is on the real transistor. I
mean, the order of the pins is different on every transistor, depending
on the maker. I recomend you look at it on the specs page (try
motorola.com or national.com)...
Leo
=====
I'm here... http://geocities.com/l.boulton
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11020 Mon, 28 Feb 2000 10:08:21 PST [alt-beam] Re: Schematics beam@sgiblab.sgi.com "Timothy Flytch" I use ... arrow Pointing iN ... =PNP
and
arrow Not Pointing iN... = NPN
And remembering this also helps with diodes too...
Timothy...
>
>Yup - something like that, but backwards. Arrow out = NPN (2N3904), Arrow
>in = PNP (2N3906).
>
>John
>
>
>
______________________________________________________
11021 Mon, 28 Feb 2000 10:21:12 -0800 [alt-beam] Re: bot video beam@sgiblab.sgi.com Bruce Robinson Dane Gardner wrote:
>
> That's funny...I couldn't d/l it off of Angelfire. It kept sending
> me to an HTML file with a link instead of the actual avi. Do you
> have an FTP mirror? Or a simpler way to D/L it off HTML? We must
> both be using MS Explorer. It's browser is easily confused.
Interesting. It runs fine off Netscape 4.05. Anyone else try this?
Bruce
11022 Mon, 28 Feb 2000 13:14:46 EST [alt-beam] Re: Walkers beam@sgiblab.sgi.com JVernonM@aol.com In a message dated 2/28/00 9:28:37 AM Eastern Standard Time,
phillip@ryals.com writes:
> Well, most don't. From all I've read, Mark Tilden is the only one who's
> done it. I think it has something to do with sticking in photodiodes in
> place of a resistor in the circuit. Basically, you just need to alter the
> timing enough to make the back legs turn a little more one way than the
> other.
>
> Still, without a waist motor, a 2 motor won't turn terribly quickly, AFAIK.
> Anyone else who's managed this feat?
>
Actually, this has been done quite recently. Justin has come up with an
arrangement that couples Wilf's power smart head with the Hemicore walker
circuit. It not only turns (a video can be seen at Adaptobotics.com) but, is
highly positively phototropic. I've built one as well, but haven't posted it
yet. Still need to replace the gumby legs. Look around a little. There's a
lot of cool stuff out there.
See ya,
Jim
http://www.geocities.com/SoHo/Exhibit/8281/beamart.html
ICQ# 55657870
11023 Mon, 28 Feb 2000 10:16:45 -0800 [alt-beam] Re: bot video beam@sgiblab.sgi.com Bernard Nazari Hey All,
I think I figured out how to view the video. Let Netscape download
the thing, then go to your cache and look for an AVI file that's a 1.5 or
so megs. Copy the file to another directory before Netscape cleans out the
cache and you're set! I think the problem is that Angelfire wants to
advertise with each web-page and when you try to directly access the AVI
file without going through a link, it gives you problems. Anyway, take care!
Bernie
P.S. Sparky, that is a great video! Now, what did you do after the walker
spilled all that water! :-)
At 08:04 AM 2/28/00 -0600, you wrote:
>Hey All:
>after many request, i have a video up of my walker.
>i plan to link to it from my bot's home site, but you can go directly to
>the video at:
>www.angelfire.com/electronic/botvideo
>but:
>i myself can't get the link to werk, but a friend says that the link works
>fine.
>must be somethin with my browser?
>anyways, test it out and let me know if it werks.
>Thanks for the help!
>-Sparky
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