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Thermaltake rotation's speed fan

Discussion in 'Electronic Basics' started by Shiva MahaDeva, Jan 29, 2005.

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  1. Hi all:

    I bought a Thermaltake Smart II CPU fan to put un my Ultra 5
    This fan haves a third wire, to get fan's rotation speed, but Ultra 5
    haves this option. Is there any way to use paralell port to get third
    wire data ? My friend told me that I could put a diode and a resistor
    current`s limitation and connect in paralell port, but how could I
    make this ?
    Thanks in advance.
  2. bloo

    bloo Guest

    I guess that you have a 12v sqare signal about 5Khz. Maybe you can use
    a 1N751A with a 10K in series to limit current and drop down to 5.1v.
    I would choose serial over paralell port.

    R 10K
    [fan]---/\/\/\/\---+-----> to Serial
    Zener /\
    | Gnd
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