Alt-BEAM Archive
Message #11938
To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Wed, 15 Mar 2000 19:35:25 -0600
Subject: [alt-beam] Re: Once more, a reminder for the Lego MotorsMini
Hey, $11.00 for any usable gear motor is a good price. It's hard to find
new motors under $20, and that is still low. That price is almost like a
surplus price, except for a new item! I'd be very happy to pay $11 for
quality motors!
Hopefuly these motors will become very useful for us!
BUDSCOTT@aol.com wrote:
>
> The U.S. part ain't a problem, and i can stand shipping but sheesh, $11.00
> that is a bit pricy, but i suppose thats the price you pay for a good bot! Do
> they have any other models that are cheaper? Size doesn't matter too much to
> me, i just like to find some kind of servol or motor that is consistant and
> "price efficient" (I can only go without eating for so long!) ThAnKs! I like
> your .giff, lots smaller than any .mov or .ram!
>
> -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!!!
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11939 Wed, 15 Mar 2000 21:21:12 EST [alt-beam] Re: FRED bread boarded...problems beam@sgiblab.sgi.com "Corey Centen" Thanks for all the info...actually ... I'm using a 10k resistor where it
says 33k resistor in the schematic..is this ok? As for the cap..i got a
4.7uf cap. Which side is which of the cap?
Thanx again!
>From: Ben Hitchcock
>Reply-To: beam@sgiblab.sgi.com
>To: beam@sgiblab.sgi.com
>Subject: Re: FRED bread boarded...problems
>Date: Thu, 16 Mar 2000 12:44:26 +1100 (EST)
>
>Hi,
>
>For those of you not familiar with the FRED solar engine, check out
>http://wollongong.apana.org.au/~ben/fred/schematic.html.
It's a solar
>engine that can make a photopopper out of some pretty cheap components. I
>used a slightly modified version in my seaplane (linked from that page).
>
> > Is it possible to make some componenet changes in the FRED design. Have
> > a
> > 4700uf cap and 2.2k resistors instead of 4.7uf cap and 3.3 resistors?
>
>It is possible to make lots of changes to the FRED circuit and still have
>it working fine. Some changes might even improve performance. The onyl
>way to tell is to actually try it.
>
>2.2k resistors will increase the lowest light level that FRED will work
>in, and raise the switch-on voltage slightly, but it should work.
>
>4700 uF is way too high. The idea is that this cap is low enough to
>charge up very quickly - otherwise there isn't much point making a FRED, a
>standard FLED SE will do the same job. Use something small such as a 0.22
>uF cap or 0.1 or so. You might have some of thse lying around drom a
>microcore project.
>
> > I
>just bread-boarded FRED but it didn't work. The FLED would flash but the
> > motor would not turn. I only bread-boarded half the circuit, or one
>engine.
> > I don't know why this is. Where does the second wire of the FLED go? Any
> > help would be appreciated.
>
>What values are you using? Are you using a 33k resistor to bias the FLED?
>If so the FLED should be very faint. Is your cap (4.7 uF) around the
>right way? If you're using a 4700 uF cap then this is your problem.
>
> > Also...
> >
> > If I use a larger voltage than something like a 2 or 3 volt solar panel,
>do
> > I need a larger cap?
>
>The FRED design will turn on at about 2.4 volts so no matter how high your
>solar panel voltage is, it will never get there.
>
>I used a calculator solar panel on my seaplane robot (See the FRED page
>for a link to it).
>
>hope this helps,
>
>Ben
______________________________________________________
11940 Wed, 15 Mar 2000 18:25:37 -0700 [alt-beam] Re: FRED bread boarded...problems beam@sgiblab.sgi.com Robert Stein At 05:48 PM 3/15/00 -0500, you wrote:
>Hi all, sorry to bother again,
>
>I just bread-boarded FRED but it didn't work. The FLED would flash but the
>motor would not turn. I only bread-boarded half the circuit, or one
>engine. I don't know why this is. Where does the second wire of the FLED
>go? Any help would be appreciated.
>
>Also...
>
>If I use a larger voltage than something like a 2 or 3 volt solar panel,
>do I need a larger cap?
>
>Thanks!
>______________________________________________________
>
11941 Wed, 15 Mar 2000 10:01:56 -0800 [alt-beam] Re: Once more, a reminder for the Lego MotorsMini "Dennison Bertram" Perhaps one of the best uses for these tiny gearmotors is in the
consturction of tiny Stryder and Walkman type bots.
dennison
Hey, $11.00 for any usable gear motor is a good price. It's hard to find
new motors under $20, and that is still low. That price is almost like a
surplus price, except for a new item! I'd be very happy to pay $11 for
quality motors!
Hopefuly these motors will become very useful for us!
BUDSCOTT@aol.com wrote:
>
> The U.S. part ain't a problem, and i can stand shipping but sheesh, $11.00
> that is a bit pricy, but i suppose thats the price you pay for a good bot!
Do
> they have any other models that are cheaper? Size doesn't matter too much
to
> me, i just like to find some kind of servol or motor that is consistant
and
> "price efficient" (I can only go without eating for so long!) ThAnKs! I
like
> your .giff, lots smaller than any .mov or .ram!
>
> -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
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