Alt-BEAM Archive
Message #13331
To: beam@sgiblab.sgi.com
From: Bruce Robinson Bruce_Robinson@telus.net
Date: Mon, 10 Apr 2000 17:19:15 -0700
Subject: Re: motor problems (nobody knows???)
Aaron Letts wrote:
>
> Nobonby knows this? I asked my dad and he said it may
> have something to to with the motors being AC not DC.
Hey, Aaron, I've taken apart a few VCR's, and all the motors I've found
are low voltage DC. The first thing that ole' AC power cord is attached
to is a DC power supply.
I suspect you aren't getting much help because your question is too
general. What kind of solar engine? Where's the circuit? If you're a
little more specific, there's probably someone out there who can help
you.
Bruce
13332 Mon, 10 Apr 2000 17:21:32 -0700 Re: WCRG? beam@sgiblab.sgi.com Bruce Robinson Dave Hrynkiw wrote:
>
> At 05:35 PM 4/6/2000 , BUDSCOTT@aol.com wrote:
>> ... Which brings me to a question, what are the walker
>> competitions like? C'ya later!
>
> I'm embarrassed to say that they're still being firmed up.
> Will have the rest of the rules finished and online by the
> end of the weekend.
Which weekend, Dave? :)
Bruce
13333 Tue, 11 Apr 2000 10:29:03 +1000 (EST) Re: motor problems (nobody knows???) beam@sgiblab.sgi.com Ben Hitchcock Sounds like a rogue oscillation problem.
This often happens with not-so-efficient motors.
Try a 0.1 uF or so cap on various parts of the circuit, such asbetween
ground and the base of the PNP transistor.
Solder one end to ground, and poke the other end around your circuit and
see where it helps the most.
hth,
Ben
> Nobonby knows this? I asked my dad and he said it may
> have something to to with the motors being AC not DC.
> Can anyone confirm that this is the reason why this is
> happening? And what I an do to solve it?
>
>
> Aaron
>
>
>
> --- Aaron Letts wrote:
> > I just got 2 VCRs from the dump and I tore them
> > apart.
> > I got 3 motors from each. So, I made a simple
> > solarengine to put on one of the ones that I thought
> > was good, just to give it a try. After I was done
> > when
> > I was testing it, I ran into some problems. I would
> > put it under the lamp, then it would go like it was
> > suppose to, but it wouldn't trigger again, and it
> > would make a high pitched sound. After I took it out
> > of the light, then put it back in agian, it would
> > go,
> > but only once. It would never go twice, I had to
> > take
> > it out of the light, then put it back in. Why does
> > it
> > do this, and what can I do to fix it?... if there is
> > anything at all.
> >
> > Thanks,
> >
> >
> >
> > Aaron
> >
> >
> _______________________________________________________
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> > Get your free @yahoo.ca address at
> > http://mail.yahoo.ca
> >
>
> _______________________________________________________
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--
Nothing is foolproof to a sufficiently talented fool.
13334 Mon, 10 Apr 2000 17:35:55 -0700 Re: m/s bicore walker beam@sgiblab.sgi.com Bruce Robinson "Phillip A. Ryals" wrote:
>
> It's a m/s bicore.
>
> I thought it should be just .01uF. Was I mistaken?
Motorola recommends between 0.022 uf and 0.1 uf.
Bruce
13335 Mon, 10 Apr 2000 17:33:42 -0700 Re: Walker "hanging" gait problems beam@sgiblab.sgi.com Bruce Robinson Bernard Nazari wrote:
>
> ... The problem is that once in a while, the sequence freezes on
> a LED. (I'm using LEDs right now and I don't have the H-bridge/motors
> hooked up yet.) I was thinking that the cap on it is not getting
> drained and that's why is freezes. I have checked and rechecked
> for flux about a thousand times, so that's not the issue ...
Hi, Bernie. Sounds like
1) Faulty connection to ground through the resistor on the
offending Nv (i.e., connection is broken). Flux wouldn't
cause this.
2) Accidental contact between Vcc and the bias point on the
offending Nv. Flux could cause this, but so could a stray
solder blob or component lead.
> ... The only other thing I thought of was that the traces ended
> up too thin when I etched the board and not enough current is
> passing through to discharge the cap.
Recommeded trace width for signals is 0.025" or greater, for 1 oz/sq
foot PCB. Note that the thickness of the copper on the board is 0.0007",
so even a little etching action on the surface of a trace could do you
in.
Bruce
13336 Mon, 10 Apr 2000 18:51:21 -0600 Re: sumop "Verne & Catherine Rambaud"
I was thinking about including a circuit that would send a shock through its
frame to protect itself from other bots, siblings, children, and animals.
by the way these discussions of sumo bots are going its going to end up like
this http://www.robotwars.co.uk/
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