Alt-BEAM Archive

Message #07942



To: beam@sgiblab.sgi.com
From: "Timothy Flytcher" flytch@hotmail.com
Date: Tue, 23 Nov 1999 12:49:55 PST
Subject: [alt-beam] Re: Parallel 3904's


>Hi there;
>
>Forgive my newbiness, I am just getting into this....
>
>Would running transistors in parallel effectively lower the voltage drop
>across the transistors that run the motors? The reason I am asking is that
>for the speed controls in the electric model airplanes I build/fly the
>designers use multiple FETs in parallel to lower the effective resistance.
>I was wondering if this principal might be applicable/useful to these
>little
>robots to give them just a little more oomph.
>
Yes and no... our R/C model motors are drawing a lot of amps and operating
at the edge of the speed controls abilities... our bots are not... :) the
major gain is simplicity and elegance...
Timothy...

______________________________________________________



7943 Sun, 21 Nov 1999 14:50:48 -0600 [alt-beam] Re: photowalker beam@sgiblab.sgi.com SG My question is, why would you need a HEAD at all?
I mean if it already goes to and locks on the brightest source of light.
I'm sure i'm missing something here.
_sparky

At 11:36 AM 11/23/99 -0800, you wrote:
>
>Wilf,
> You are the man. The schematic that you posted last
>night works like a peach. A lot of my hair thanks you
>as they get to hang out and party on my head a while
>longer. I put the circuit (minus the head motor) on
>my walker and it does display phototropic abilities.
>If the light is off to the side, it walks that way
>then straightens out when going directly to it (one of
>the led's starts blinking away when it is locked on...
>kind of helpful and cool to see). I'll put the head
>motor on later on today and start to fiddle with it in
>that way. Just had to make sure it could walk
>phototropically first (who said you can't make a
>phototropic 2 motor walker?). I am not quite sure how
>I am going to make the body keep up with the head,
>that could pose some sort of a problem as the head is
>going to be in the front of the bot. I thought that
>maybe some sort of one shot nv that diables the head
>motor when the body is swinging around to allow it to
>catch up might work but will work on it later. I'll
>let you know how the expirementing goes with it.
>Thanks again Wilf, you made my day... or week rather.
>Justin
>
>=====
>A motor is a robot waiting to happen
>__________________________________________________
>Do You Yahoo!?
>Bid and sell for free at http://auctions.yahoo.com
>
>

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