23rd Aug 2019, 10:02 pm
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#20
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Dekatron
Join Date: Jul 2007
Location: Evesham, Worcestershire, UK.
Posts: 4,241
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Re: Fan speed control by OP of amp.
Usually, the 2 extra wires on 4 wire fans are for tacho out and PWM in.
http://pavouk.org/hw/fan/en_fan4wire.html
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