Alt-BEAM Archive

Message #06610



To: beam@sgiblab.sgi.com
From: "David Shaw" vrpostcard@hotmail.com
Date: Mon, 11 Oct 1999 11:07:13 EST
Subject: [alt-beam] Re: Australian Beamers?


Hey Dude..

I joined the list about 2 weeks ago. Just getting the feel for things. I
come from Picton (about 1.5 hours south of Sydney). Check out Robot Oz for
parts.. www.robotoz.com.au

Dave S.


>From: Elmo
>Reply-To: beam@sgiblab.sgi.com
>To: Beam Mailing List
>Subject: Australian Beamers?
>Date: Mon, 11 Oct 1999 10:45:57 +1000
>
>Hi there people
>
>I have just joined up with the beam mailing list and was wondering how
>many Australian beamers there was? I am from Melbourne and would love to
>hook up with some other people to swap ideas and most of all any
>information on local component suppliers....seems i still have to buy a
>lot of stuff from solar robotics.
>
>Well if your out there....drop me a line
>
>
>Elmo
>
>

______________________________________________________



6611 Sun, 10 Oct 1999 18:14:52 -0700 [alt-beam] Re: Capacitors... "'beam@sgiblab.sgi.com'" Wilf Rigter Hate to tell you this but I think you're mixed up between uF and F. I'm
almost certain that the "pack" of capacitors you bought are 4.7uF and those
are much too small to be used as "energy storage" capacitors (ie Super
Caps). Alll is not lost however since these 4.7uF caps can be used instead
of the more commonly specified 10uF caps for PNC or Nu circuits used for
turning and reversing functions. With half the normal capacitance you just
double the associated resistor value and you achieve the same "time-out"
(time constant) and that is what is what matters most. If you multiply a
resistor value times a capacitor value and for any combination of other
values if the product is the same, the time constant is the same too. So you
see that different combinations of resistors and capacitors lead to the same
result and that gives you flexibility to design or build stuff with the
parts you have on hand. As for the 0.47F caps, buy it from Solarbotics or if
you really want 4.7F super caps try the Hotwheels section in your local
toystore, the XV series come with a little battery pack and when you open up
the car you'll find a nice big 4.7F (probably 2.5V or 3V) Panasonic Gold
super cap and a crummy motor. For Cdn $7, it's not a bad price. Check out
the comments below (but use no more than 4.5V to charge them for a short
time cause above 3.5V they start to leak like a sieve (like 100ma or so) and
you'll drain the battery and heat up the cap:

At 08:19 PM 9/12/99 , Richard Caudle wrote:
>I couldn't resist the temptation and tore apart my XVRacer. It has a Hot
>Wheels cap inside, at least the shrinkwrap on the cap has the
>logo. Anyway, I hooked it up to a BiCORE circuit that's still on my
>breadboard, and it seems to run a good long time before running down. 20
>minutes or so from a 5 second charge off a 9V battery. It would be nice
>to find the vendor for these caps so that we can use them in our
>SE's! Anybody have any inroads at Mattell?

I'm pretty sure they're out friend, the Panasonic Gold cap, in the 4.7F or
10F configuration (can't recall from memory). I remember the physical
dimensions matched exactly. Check the size against data in the digikey
catalog to find out for sure.

Regards,
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




Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411

> -----Original Message-----
> From: Kristopher R. Kane [SMTP:KrKGL@modempool.com]
> Sent: Sunday, October 10, 1999 4:44 PM
> To: beam@sgiblab.sgi.com
> Subject: Capacitors...
>
> Im sorry if some of you are annoyed by "newbies" asking so many
> questions, however, I dont have any other way to get answers to them.
> I have just bought a pack of capacitors, I am looking for .47F, but the
> closest one is 4.7F and some dont have an identification like that.
> (35v 10v and so on...) I am building the solleroller at Beam-Online
> (http://www.beam-online.com/Robots/Tutorials/Roller_Frame/frame.html)
> and dont have the .47F capacitor. Could I use the 4.7F? Would this
> take longer to store up energy or shorter?
>
> Kris Kane



6612 Sun, 10 Oct 1999 22:25:13 -0300 [alt-beam] to: lifebytes "alt-beam@egroups.com" michael.hirtle@ns.sympatico.ca (Michael Hirtle) this email is to lifebytes the rest of u can ignore it if u want.
I hope every thing works out well for u by geting on the mailing list

Home