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Old 12-12-2009, 07:22 AM #1
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Default How can I slow down my spiro mirrors?

Ive got a 2 mirror/motor spiro project on the go, they are powered by a single CR123a going to 2 100ohm pots.

Trouble is when the pots are at their highest resistance the motors are still spinning to fast for my liking.

Any ideas how to slow them down more without changing the power source?


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Old 12-12-2009, 08:08 AM #2
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Default Re: How can I slow down my spiro mirrors?

use pots with bigger resistance (try 200 or 500ohm)
what type of regulation do you use? A or B? and what motors?
btw you can use the C for reversing, but it needs 1 more battery

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Last edited by 3zuli; 12-12-2009 at 08:20 AM.
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Old 12-12-2009, 08:30 AM #3
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Default Re: How can I slow down my spiro mirrors?

I use A for regulation, and I have them setup for motor reversal already. I really want to keep the pots I am already using as they are very nice precision 10 turn units.

Could I just put a resistor in in line on the positive side to drop the voltage?

Thanks
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Old 12-12-2009, 08:43 AM #4
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Default Re: How can I slow down my spiro mirrors?

Quote:
Originally Posted by jaycey View Post
Could I just put a resistor in in line on the positive side to drop the voltage?
yes, you can. try different resistances.
but I recommend you using the B
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Old 12-12-2009, 08:57 AM #5
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Default Re: How can I slow down my spiro mirrors?

The use of electronics would produce more linear results. and far greater control.

It just makes your project more complex.

The positive side is, electronics would allow for greater tuning ability to the final projection.

Or simply put - cooler image possibilities.
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Old 12-12-2009, 10:49 AM #6
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Default Re: How can I slow down my spiro mirrors?

Quote:
Originally Posted by photonaholic View Post
The use of electronics would produce more linear results. and far greater control.

It just makes your project more complex.

The positive side is, electronics would allow for greater tuning ability to the final projection.

Or simply put - cooler image possibilities.
right, you can use for example this PWM schematic:

it's (very much) MORE effective than a pot
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Old 12-12-2009, 12:46 PM #7
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Default Re: How can I slow down my spiro mirrors?

I suggest you to use some kind of meshing gears. You can find them easily on your old legos
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Old 12-12-2009, 12:55 PM #8
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Default Re: How can I slow down my spiro mirrors?

You can get all sorts of gearing assemblies by disassembling any old hard-drive..... rob
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Old 12-12-2009, 12:55 PM #9
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Talking Re: How can I slow down my spiro mirrors?

^ You mean cd drive, i suppose ..... never found gears in an hard disk



@ 3zuli: LOL at "(c) Elektor Electronics" ..... if i look in one of my 15 years old collection of schemes, i see something a lot similar (maybe better say almost identical ) ..... and mine, was derived from an unusual application of 555, took from an also more old application note
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Old 12-12-2009, 01:10 PM #10
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Default Re: How can I slow down my spiro mirrors?

^ I just googled PWM 555 and this was the 1st pic
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