Hello,
As I'm quite new to electronics, I would greatly appreciate a little help with a project I'm working on in relation to PC fans.
In a nutshell, what I would like to do is to split the tacho output signal from a 12V PC fan. The purpose of this is to be able to connect one tacho output to a fan header on the PC's motherboard (for continuous reading of the fan's speed), and the other tacho output to a fan failure alarm circuit I'm currently working on.
If I understand correctly, the tacho output of PC fans is of the "open collector" type and that therefore it requires a pull-up resistor.
I've also been told that the said tacho signal split could be achieved with a couple of small transistors and a few resistors, but no specifics.
Could anyone help me with info on how to construct this "tacho splitting" circuit please? (a simple diagram would be of enormous help )
Thank you,
Joe
As I'm quite new to electronics, I would greatly appreciate a little help with a project I'm working on in relation to PC fans.
In a nutshell, what I would like to do is to split the tacho output signal from a 12V PC fan. The purpose of this is to be able to connect one tacho output to a fan header on the PC's motherboard (for continuous reading of the fan's speed), and the other tacho output to a fan failure alarm circuit I'm currently working on.
If I understand correctly, the tacho output of PC fans is of the "open collector" type and that therefore it requires a pull-up resistor.
I've also been told that the said tacho signal split could be achieved with a couple of small transistors and a few resistors, but no specifics.
Could anyone help me with info on how to construct this "tacho splitting" circuit please? (a simple diagram would be of enormous help )
Thank you,
Joe
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