Anonymous · 2014-11-02 09:02
Alright so i was wondering if its possible to wire my laptops fan to a potentiometer and mount it to the side of the thing so i would have complete manual fan control. is this possible? how would i go about finding a place to get power for the fan?
Anonymous · 2014-11-03 06:37
I don't see why not
Your computer might not like it though, and it would probably be bulky. So i'm not sure if it would be a great idea
Anonymous · 2014-11-03 08:24
what is your usecase anyway
Anonymous · 2014-11-03 15:20
>>115
running nullcpupowermanagement.kext on a laptop with a horrible dsdt thats beyond being patched from HP. they couldn't even spell "Hewlett-Packard" right in their own dsdt.
Anonymous · 2014-11-08 00:12
Computer fans typically use a control method a little different from just a DC motor. Usually a fan contains at least three signals: PWR, GND, and PWM. PWR and GND are usually 12 and 0 volts, though I think there are 5V fans. The PWM signal is set at a constant frequency around 20 kHz and the duty cycle determines the fan speed.
So break out a 555 chip if you want to build a fan control circuit, or you could use another method of generating a high speed PWM signal.
Anonymous · 2015-03-10 00:35
>>113
>>120
works at 21khz, very cheap… might well be ideal!
http://www.ebay.co.uk/itm/6V-28V-3A-PWM-DC-Motor-Speed-Controller-Switch-Regulator-Pulse-Width-Modulator-/390899409644?pt=LH_DefaultDomain_3&hash=item5b036ba2ec
Anonymous · 2015-10-13 03:35
>>116
pain incarnate
Anonymous · 2015-10-13 03:50
>how would i go about finding a place to get power for the fan
What's wrong with the original plug? Cut the PWM wire and splice your power and ground from your controller board into the power and ground wires.
>>120
555s aren't ideal for that because they don't go past 50% duty cycle. You can do it with an opamp and some passives if you can find the circuit on the tubes. Alternately use a microcontroller and you could even splice it into an i2c bus if you can find one for automated control.