Old 09-06-2009, 01:05 PM #1
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Default Potentiometer For 12volt Fan

Hey Guys
Regarding My Spiro Project
What potentiometer will i need to control the fans i know my 50k is too much.
Thanks


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Old 09-06-2009, 02:44 PM #2
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Default Re: Potentiometer For 12volt Fan

I would try maybe a 10-25k
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Old 09-06-2009, 03:09 PM #3
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Default Re: Potentiometer For 12volt Fan

Quote:
Originally Posted by laserpyro View Post
Hey Guys
Regarding My Spiro Project
What potentiometer will i need to control the fans i know my 50k is too much.
Thanks
I use 100ohm pot and it does great job.
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Old 09-06-2009, 04:17 PM #4
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Default Re: Potentiometer For 12volt Fan

Only check that your potentiometers have enough power, otherwise you risk to fry them (a 12V fan that adsorb 150 mA, usual values in PC fans, eats 1,8W, after all).

Anyway, if you want to do it a bit more professionally, use speed regulator circuits, instead just potentiometers ..... a pair of transistors and few other components, it's easy to build ..... or, being this a laser forum, you probably have already around some old LM317, and with this and one potentiometer, one resistor and two capacitors, you can assemble it in a flash
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Old 09-06-2009, 04:26 PM #5
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Default Re: Potentiometer For 12volt Fan

Quote:
Originally Posted by HIMNL9 View Post
Only check that your potentiometers have enough power, otherwise you risk to fry them (a 12V fan that adsorb 150 mA, usual values in PC fans, eats 1,8W, after all).

Anyway, if you want to do it a bit more professionally, use speed regulator circuits, instead just potentiometers ..... a pair of transistors and few other components, it's easy to build ..... or, being this a laser forum, you probably have already around some old LM317, and with this and one potentiometer, one resistor and two capacitors, you can assemble it in a flash
what values for the pot, resistor and capacitors do you recommend?
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Old 09-06-2009, 04:55 PM #6
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Default Re: Potentiometer For 12volt Fan

If you need it just as speed regulator, you can use a lot of values, cause there's nothing critical in the circuit, used in this way (i mean, not as current regulator like for the LD's)

A circuit similar to this, can work without any problem for the most part of the PC fans, and is realizable also wih spare or "used" parts you find around, if you need it on-the-fly (for definitive use, i anyway suggest to put the regulator on somethng that act as heatsink)



The 100 nanofarad cap on the adj pin can also be omitted, it just keep it more stable
Attached Thumbnails
Potentiometer For 12volt Fan-fanspeedreg.jpg  
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Old 09-06-2009, 06:18 PM #7
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Default Re: Potentiometer For 12volt Fan

Fan is much more resistant to overvoltage, capacitor is not needed at all.
I bought these 0.5W pots and they work great with 12V fans.
Pots never get warm.
100 ohms Single Turn Wirewound Potentiometer & Knob - eBay (item 230331423312 end time Aug-17-09 06:05:39 PDT)

Why to complicate this?
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Old 09-06-2009, 06:28 PM #8
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Thumbs up Re: Potentiometer For 12volt Fan

^ These ones works cause are WIRE potentiometers, not carbon layer ones

Most of the times, peoples uses normal carbon layer potentiometers, and fry them (your model is almost 10 times robust than a carbon layer one

I was thinking you referred to carbon layer ones, for this reason suggested a regulator
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Old 09-06-2009, 06:53 PM #9
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Default Re: Potentiometer For 12volt Fan

^^ thanks. I think I actually understand your diagram
I'm gonna give it a try.
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Old 09-06-2009, 07:32 PM #10
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Default Re: Potentiometer For 12volt Fan

My fan (40mm) uses only 60mA.
Maybe that is reason why pot is cold.

However.
I thinks that this is the cheapest and theeasiest way to control fan speed.
DealExtreme: $6.65 3-Fan Cooling Fan Variable Speed Controller for PC
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