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Potentiometer For 12volt Fan

laserpyro

laserpyro

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





HIMNL9

HIMNL9

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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 ;)
 
ColdStl

ColdStl

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HIMNL9 said:
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 ;)
Click to expand...

what values for the pot, resistor and capacitors do you recommend?
 
HIMNL9

HIMNL9

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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)

attachment.php


The 100 nanofarad cap on the adj pin can also be omitted, it just keep it more stable :)
 

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HIMNL9

HIMNL9

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^ 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 :p
 
ColdStl

ColdStl

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^^ thanks. I think I actually understand your diagram :yh:
I'm gonna give it a try.
 
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