Alt-BEAM Archive

Message #11474



To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Tue, 07 Mar 2000 18:35:58 -0600
Subject: [alt-beam] Re: Tower hobbies servo


What's the average current consumption for them with the control
circuitry and without it?

"Feser, Jason" wrote:
>
> They rock - they are driving my ScoutwalkerII which is extremely powerfull
> and I ripped an old one (same model) out of my RC speed control and used it
> for my 3J1 head. They make a lot of noise, but are very strong and a good
> speed for walkers. They require minimum modification and have so far been
> hassle free.
>
> I've done a lot of checking, and I would have to say that they are the best
> bang for the buck as far as hobby servo's go....
>
> -----Original Message-----
> From: BUDSCOTT@aol.com [mailto:BUDSCOTT@aol.com]
> Sent: Tuesday, March 07, 2000 3:37 PM
> To: beam@sgiblab.sgi.com
> Subject: Tower hobbies servo
>
> i really want to start on a second walker and was thinking of using the
> servos from solarbotics (the tower hobby ones). Are they decent to use for
> the cost?
>
> -Spencer

--


Richard Piotter The Richfiles Robotics & TI web page:
richfile@rconnect.com http://richfiles.calc.org

-- Make Money by Simply Surfing the Net or responding to E-Mail!!!
-- Click below!!!

http://www.alladvantage.com/go.asp?refid=ATL147
http://www.spedia.net/cgi-bin/dir/tz.cgi?run=show_svc&fl=8&vid=329630



11475 Tue, 7 Mar 2000 19:48:37 EST [alt-beam] Re: Tower hobbies servo beam@sgiblab.sgi.com BUDSCOTT@aol.com cool, i figure i'll let my bicore/microcore mail go for a while, see what one
seems to have the upper hand (probably bicore) and then go surplus surfin, if
and when that fails, i'll fall back on those servos! if you want loud, try
thirty some year old display motors that my grandfather had for displays at
his old liqiur store, 5 rpms, but they work better thn to be expected!

-Spencer



11476 Tue, 7 Mar 2000 19:51:56 -0500 [alt-beam] Re: Transistor codings "Russ Tedrake"
The January 2000 issue of Nuts and Volts had a little section called "In
Search Of The Lost IC" (p. 83). Here's a summary of what they have to say:

Step 1 - Try to identify the manufacturer. These tables will help:
ftp://ftp.nutsvolts.com/pub/nutsvolts/library/icprefix.doc or
ftp://ftp.nutsvolts.com/pub/nutsvolts/library/icprefix.pcx

Step 2 - Try http://www.questlink.com. Then try dropping the prefixes and
suffixes... just search for the number. You might find an identical chip
by another manufacturer.

Step 3 - Try some online catalogs (search for just the number again):
http://www.digikey.com
http://www.techam.com
http://www.mouser.com
http://www.alltronics.com
http://www.jameco.com
http://www.newark.com
http://www.alliedelec.com/default.asp

Step 4 - Look for replacement parts from http://www.nteinc.com

Step 5 - If all else fails, here are a few more obscure dealers to try:
http://www.batnet.com/justintime/JUTIC.html
http://www.onlinetechx.com
http://www.drcomponents.com/stockcheck.html


Credit goes to TJ Byers and Nuts and Volts for this info...

- Russ T.

> -----Original Message-----
> From: owner-beam@sgiblab.sgi.com [mailto:owner-beam@sgiblab.sgi.com]On
> Behalf Of Mike Kulesza
> Sent: Tuesday, March 07, 2000 9:20 AM
> To: beam@sgiblab.sgi.com
> Subject: Re: Transistor codings
>
>
> whats written on them????
>
>
> >From: Marcus Cole
> >Reply-To: beam@sgiblab.sgi.com
> >To: beam@sgiblab.sgi.com
> >Subject: Transistor codings
> >Date: Tue, 07 Mar 2000 07:05:12 -0500
> >
> >Hello all,
> >
> >I have been busy dismantling a few electronic devices, and i was
> wondering
> >how to find the specs of those transistor i salvaged? There is 2 rows of
> >alpha-numerical data written on them, but i do not know how to interpret
> >them. Any one knows how to do that?
> >
> >
> >
> >No matter how straight the Gate,
> >How charged with punishment the Soul,
> >I am the Captain of my Fate,
> >The Master of my Soul
>
> ______________________________________________________
>


11477 Tue, 7 Mar 2000 19:54:44 EST [alt-beam] Re: Quick-Change components beam@sgiblab.sgi.com BUDSCOTT@aol.com Using sockets is extremely helpful, because you don't even need a PCB, you
just glue them buggers together and ta-da! you've got yourself a small little
PCBless circuit, very helpful!

-Spencer



11478 Tue, 7 Mar 2000 17:00:22 -0800 Re: Tower hobbies servo beam@sgiblab.sgi.com Richard Piotter [mailto:richfile@rconnect.com]
What's the average current consumption for them with the control
circuitry and without it?

"Feser, Jason" wrote:
>
> They rock - they are driving my ScoutwalkerII which is extremely powerfull
> and I ripped an old one (same model) out of my RC speed control and used
it
> for my 3J1 head. They make a lot of noise, but are very strong and a good
> speed for walkers. They require minimum modification and have so far been
> hassle free.
>
> I've done a lot of checking, and I would have to say that they are the
best
> bang for the buck as far as hobby servo's go....
>
> -----Original Message-----
> From: BUDSCOTT@aol.com [mailto:BUDSCOTT@aol.com]
> Sent: Tuesday, March 07, 2000 3:37 PM
> To: beam@sgiblab.sgi.com
> Subject: Tower hobbies servo
>
> i really want to start on a second walker and was thinking of using the
> servos from solarbotics (the tower hobby ones). Are they decent to use for
> the cost?
>
> -Spencer

--


Richard Piotter The Richfiles Robotics & TI web page:
richfile@rconnect.com http://richfiles.calc.org

-- Make Money by Simply Surfing the Net or responding to E-Mail!!!
-- Click below!!!

http://www.alladvantage.com/go.asp?refid=ATL147
http://www.spedia.net/cgi-bin/dir/tz.cgi?run=show_svc&fl=8&vid=329630



11479 Tue, 7 Mar 2000 19:58:54 EST [alt-beam] Re: Capacitor Values beam@sgiblab.sgi.com CIRCITZ@aol.com Using the formula:

1/{2(pi)FC} where 'F' is the Frequency and 'C' is the capacitance

you'll get the capacative reactance, basically telling you what the
resistance of the capacator is to AC...(since a cap in series blocks all DC
you don't worry about the resistance to DC)...so if you were isolating the
wave generator running at 1Mhz you would put that into the formula to try to
find the capacator that would give you the least amount of reistance.

example
(rearranging the formula)
C = 1/{2(pi)F}
C = 1/(6.283 * 1^6)
C = 1/(6.28^6)
C = 159nF
so for the smallest resistance you would want to throw a cap with as close to
that value as possible...which would be 159nF...
just hope this helps a little, let me know how it works out.
Dan

<< The thought just occured to me, how do you pick values
for capacitors when they're not part of a timing
circuit? For instance, in school we're learning about
amplifiers. Very simple, except for the two
capacitors. I get why they're in there. I know what
they do when they're not in there. But how do you
derive the values? One blocks the DC from getting into
the generator, effectively isolating it from the
circuit. The other is tied between the emitter and
ground, so that the AC we are generating doesn't turn
off the transistor. Again, these are used to block DC
and pass AC only. How do you go about getting the
correct values needed?

~Daniel >>



11480 Tue, 7 Mar 2000 20:02:39 EST [alt-beam] bicore stacking beam@corp.sgi.com Bumper314@aol.com Hello,
If I put to suspended bicores on a 240, can I then stack the 240's to
increase drive?

steve



11481 Tue, 7 Mar 2000 19:45:32 -0500 RE: Tower hobbies servo Feser, Jason
> They rock - they are driving my ScoutwalkerII which is extremely powerfull
> and I ripped an old one (same model) out of my RC speed control and used
it
> for my 3J1 head. They make a lot of noise, but are very strong and a good
> speed for walkers. They require minimum modification and have so far been
> hassle free.
>
> I've done a lot of checking, and I would have to say that they are the
best
> bang for the buck as far as hobby servo's go....
>
>
> -----Original Message-----
> From: BUDSCOTT@aol.com [mailto:BUDSCOTT@aol.com]
> Sent: Tuesday, March 07, 2000 3:37 PM
> To: beam@sgiblab.sgi.com
> Subject: Tower hobbies servo
>
>
> i really want to start on a second walker and was thinking of using the
> servos from solarbotics (the tower hobby ones). Are they decent to use for
> the cost?
>
> -Spencer
>

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