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Three Out of Two Ain’t Bad

Add a tachometer output to 2-wire fans

Three Out of Two Ain’t Bad
If you replace a broken three-wire fan in a PC or other device with a more readily-available two-wire fan, the missing tachometer (‘tacho’), signal will cause the system to report a fault and possibly even refuse to function at all. The problem is solved with the circuit shown here, which analyses the fan current to generate a signal that corresponds to its rotation speed.
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