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[SOLVED] Would this work? First DYI :)

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Killovicz

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Dear all :)

Thank you very much for your time and effort, any replays would be deeply appreciated.

Would this be safe to try and would it work? Thx in adv :)

 

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Assuming your control pin at the fan is voltage controlled and, say, 100K impedance...

This schematic may be what you want.

68_1332302101.gif


If volt level absolutely must never go above 5.25 V, then use a 13K resistance instead of 12K.
 
If you are trying to control a normal CPU fan, designed to connect to a PC motherboard, then that circuit won't work.

The fan is not voltage controlled, it is PWM (pulse-width modulated) controlled.

You need to make a PWM controller - there are many examples if you search google, here is one that's about as simple as you will find:

**broken link removed**

Here's another, with complete construction details:

https://www.overclockers.com/pwm-fan-controller
 
First of all thank you both very much :D (+1 BOTH!), special thanks goes to BradtheRad for the schematic drawing (even tho I'm not yet familiar with all the symbols nor the term "100K impedance", nor do I understand how a 10K resistor can provide variable voltage) I'll go back to Electronics for dummies and continue reeding bot capacitors :)

Also special thanks to FoxyRick fpr providing very useful links, I'll definitely use 'em just not now, I have gathered diagrams before without knowing what I do like: LM185IT-ADJ/NOPB or analogue thermometer etc. But this time I decided to try to understand a bit more electronics rather then just connect 'em.

So I bought Electronics for dummies and read 25% yesterday, so I felt a great urge today to put some of all that theory into practise, it was not to be.

Once again thanks a lot guys :)
 

First of all thank you both very much :D (+1 BOTH!), special thanks goes to BradtheRad for the schematic drawing (even tho I'm not yet familiar with all the symbols nor the term "100K impedance", nor do I understand how a 10K resistor can provide variable voltage)

* The 10K component is a potentiometer. Same as a volume control. I believe your schematic has one with a value of 50K.

* 'Input impedance' is a spec which gives some idea what amount of current is drawn by the control terminal on the fan.

Best of luck with your project.
 
The 10K component is a potentiometer. Same as a volume control. I believe your schematic has one with a value of 50K.

Ohh, ic ic, now, there is no need for 2 regular and one variable as in my set-up, just make sure that the 10 or 11k after the potentiometer eats at least 6.5V. :)

Input impedance' is a spec which gives some idea what amount of current is drawn by the control terminal on the fan.

Ohh that, I tought bot tht -->> tried to measure resistance, no luck -->> so I tought Ill try with 1/4W resistor and if it gets to hot I'll then try with ½W.

--------------------------------------------------------------------------------------------------------------------------------------------------

Once again thanks for everything(+1): drawings, schematics analysis (lol), therm explanation , noob tolerance, issue elumination, etc.. AND YOUR TIME AND EFFORT, my deepest gratitude :)

Best regards to all, Killovicz
 

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