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tacho for comp fan

Discussion in 'Electronic Basics' started by Neil Williams, Aug 8, 2003.

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  1. how would a bar graph be conected to a tacho wire in order for it to show
    the approx. speed of the fan when used in conjunction with a fan speed
  2. cpemma

    cpemma Guest

    Via a digital-to-analogue converter and an LM3914, it's 2 pulses per rev
    (RPM/30 Hz). Note the fan sensor output is generally open-collector, so
    you'll need a pull-up resistor.

    LM2917 is a suitable DAC, but it's far easier just to get a bargraph of the
    fan voltage. My cpu fan RPM is damn near linear with voltage between 7.5v
    and 12v, though it's y=mx+c, not y=mx.
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