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By IC with alarm(IRD) for fan

Discussion in 'General Electronics Discussion' started by mehdok, Mar 7, 2013.

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  1. mehdok


    Mar 7, 2013
    i have bought a new 12cm, 12V fan for pc, it has 3 wire, so as usual i thought the 3rd wire is for showing fan speed, but it didn't work that way.
    i searched fan model and i found "model number scheme" for all of company's fans, as u can see in the below image, this fan has the following :
    function description : By IC with alarm(IRD) (the fan model have number 2 in that position)
    i think this is the function of 3rd wire, so what this mean and how i can use this ?

    i have found this schemes for function of 3rd wire, but i have a little knowledge of electronic, so can you describe this function to me with simple words ?
    Last edited: Mar 9, 2013
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