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Old 04-07-2009, 07:39 PM #1
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Default Tiny Pots?

I was thinking of making a tiny spiro build, with these motors:
http://pagermotors.com/index_files/P...NW/7mm(NW).htm

And the only pots that I can find are rather large. Like this large:
http://www.maplin.co.uk/Module.aspx?ModuleNo=2203

Where can I find smaller potentiometers?

Also, I have some general Spirograph questions:
What is a good value for a pot using those pager motors above?
Lastly, do the mirrors need to be slightly wonky to make the most complicated patterns?

Rob


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Old 04-07-2009, 08:05 PM #2
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Default Re: Tiny Pots?

Here you go!
http://search.digikey.com/scripts/Dk...me=RV6N101C-ND
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Old 04-07-2009, 08:14 PM #3
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Default Re: Tiny Pots?

Thanks for the link
Do you order from there often?
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Old 04-07-2009, 08:21 PM #4
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Default Re: Tiny Pots?

Yes, I order from DigiKey all the time...

Super fast shipping, but we are both in the U.S.

The only thing bad, is that you have to pay a $5 dollar handling fee for small orders.
Jay
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Old 04-07-2009, 08:21 PM #5
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Default Re: Tiny Pots?

I was thinking of making a tiny spiro build, with these motors:
Those are the motors I use, they are nice and quiet

And the only pots that I can find are rather large. Like this large:
Where can I find smaller potentiometers?
I will try and find a link to the smallest ones I have found

Also, I have some general Spirograph questions:
What is a good value for a pot using those pager motors above?
100 ohm is what I always use
Lastly, do the mirrors need to be slightly wonky to make the most complicated patterns?
very slightly crooked, in fact if you try to get them straight you will be about right.

Regards rog8811

[edit]This is the one I use for small, it is a preset but you can make s small plastic knob and stick it in the screwdriver hole, which goes right through
http://cgi.ebay.co.uk/5-100R-Vertica...742.m153.l1262[/edit]
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Old 04-07-2009, 08:29 PM #6
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Default Re: Tiny Pots?

Quote:
Originally Posted by jayrob
Yes, I order from DigiKey all the time...

Super fast shipping, but we are both in the U.S.

The only thing bad, is that you have to pay a $5 dollar handling fee for small orders.
Jay
Actually I'm in the UK, and shipping is like $20. Next time you order, could you let me know, add a few of those in, and ship them to me when you get them?

I'd be happy to pay a bit for the privelige, plus of course the cost of the shipping + the actual pots

Rob

Edit:
And also, how do you get these amazing patterns:


I have a 3 mirror spiro, and it can't do that. Is is the pots, the motors, or the mounting angle?

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Old 04-07-2009, 08:44 PM #7
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Default Re: Tiny Pots?

I am ready to order from DigiKey now as a matter of fact...

You may want to search and see if you want knobs as well. Here's some nice ones that fit the 1/8" shaft that the pot has:
http://search.digikey.com/scripts/Dk...me=226-2120-ND

Let me know what all you want from them, and I will get you a total. I will add $5 dollars to cover my shipping and PayPal fees...
Jay
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Old 04-07-2009, 09:04 PM #8
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Default Re: Tiny Pots?

They look good - thanks Jay. I'm going away very soon for a few days, so can I take you up on your offer next time you order please?

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Old 04-07-2009, 09:08 PM #9
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Default Re: Tiny Pots?

No problem, just let me know how many you want of each and I will get a total. Then I can order after you send PayPal...
Jay
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* FS: New! 1000 Lumen XML-2 Maglite Modification With Voltage Monitor! - Parts or Complete Light! Must see!

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Old 04-09-2009, 02:18 PM #10
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Default Re: Tiny Pots?

Hi robjdixon,

Not to interupt any deal with Jayrob but I'm in the UK and I've used these trimmer pots from Rapid Electronics and they're pretty tiny.

http://www.rapidonline.com/productin...amp;kw=68-0826

Don't think the postage is too much but I'd get a few more bits at the same time to cover the costs. Rapid also do the LM317T and all the bits to build the DDL driver.

I scavenged my motors from old mobile phones. Just be careful removing the weight so as not to bend the spindle or move the grommet that prevents the spindle sliding in and out. Only one in each but if you've got a few lying around or your mates have... (Don't forget they often have 3.6V protected batteries too! And you already have the charger!) Having said all that, 2 bucks for a micro-motor? Save the hassle and buy some! ;D

Rog is quite correct about the mirrors. (Where did you get your mirrors Rog?) Trying to put them on straight is the best way to get them crooked! I used Milliput resin to mount mine as you can balance them afterwards but I didn't find this to be a big problem.

Happy building.

M
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Old 04-09-2009, 03:45 PM #11
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Default Re: Tiny Pots?

Quote:
Where did you get your mirrors Rog?
I bought an acylic mirror tile for about 3 from ebay a couple of years ago.... still got plenty left

Regards rog8811
[edit]Tiny pot (10mm x 10mm x 3.5mm) with knob[/edit]
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Old 04-10-2009, 09:39 PM #12
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Default Re: Tiny Pots?

DP to show it assembled.....
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Old 04-12-2009, 07:41 PM #13
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Default Re: Tiny Pots?

Lastly, where can I get the switches that reverse a motor, and do they increase the number of patterns a lot? Is it worthwile?

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Old 04-12-2009, 08:06 PM #14
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Default Re: Tiny Pots?

If you want to increase the number of patterns add another motor/mirror.. 8-)

Jerry
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Old 04-12-2009, 08:11 PM #15
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Default Re: Tiny Pots?

I have one with 3 mirrors, but it doesn't have as many patterns as all of the 2 mirror ones on here
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Old 04-12-2009, 08:15 PM #16
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Default Re: Tiny Pots?

Quote:
where can I get the switches that reverse a motor
You can get them here
http://cgi.ebay.co.uk/DPDT-2-Positio...1%7C240%3A1318
If you get the centre off version you can do both directions and off.

And you wire them like this......

Regards rog8811
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Tiny Pots?-motor_reverse.jpg  
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Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
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