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#1 2007-07-20 10:15:51

doki
Site Admin
From: Philippines
Registered: 2007-06-20
Posts: 586
Website

Computer fan speed tacho out circuit

Computer fan speed tacho out circuit - Add a fan speed monitor lead to any 12V two wire fan.
by: Stepan Novotill

You will find this identical circuit inside most 3 wire computer fans with speed monitoring output to the motherboard. Peel off the sticker from the fan hub in order to access a motor winding pin for connecting up the tacho circuit.

Materials:

1 - 9014C Transistor
1 - 20k Resistor
1 - 10 Resistor
1 - 2 wire 12v fan

Refer to the attached image for the circuit diagram:

Note:

I do not guarantee the accuracy or safety of any information herein. Do it at your own risk!



I only drink diluted water.

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2007-07-20 10:15:51

dremel
pcModz Bot
Registered: 2015-04-29
Posts: 8

Re: Computer fan speed tacho out circuit



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#2 2007-08-11 22:12:03

zilchjr
Moderator
Registered: 2007-07-08
Posts: 86

Re: Computer fan speed tacho out circuit

Doki have you already tried this?


:cool

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#3 2007-08-14 07:45:53

doki
Site Admin
From: Philippines
Registered: 2007-06-20
Posts: 586
Website

Re: Computer fan speed tacho out circuit

Not yet. But it works according to other forums... I'll gonna try this later...


I only drink diluted water.

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#4 2007-10-25 02:20:02

hitemhard
Member
From: Manggahan, Gen. Trias
Registered: 2007-09-21
Posts: 42

Re: Computer fan speed tacho out circuit

correct me if i'm wrong but tach output is supposed to be pulses, hence the motherboard detects this series of pulses.

when we have a two wire fan motor, it doesn't produce a tach pulse.

i think this circuit only detects current flowing from fan motor and the transistor converts this current to voltage out and not a pulse. To make it produce pulse, we will need a voltage to pulse circuit like PWM.

just an idea...hehe..

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#5 2008-11-27 21:57:21

dmelsie
Member
From: cebu
Registered: 2008-11-26
Posts: 47

Re: Computer fan speed tacho out circuit

well e try nlang para malaman hehehe


in darkness we dwell, with range we kill, in stealth we dominate...... way of the rogue

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#6 2008-11-28 16:29:28

aceskateboxx
Member
From: Batangas
Registered: 2008-08-28
Posts: 49

Re: Computer fan speed tacho out circuit

maitry nga.. smile


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