One of the other suggestions I've seen but not tried is to use 12v
fans but run them off the 5v supply so they spin slow and quiet.
Noooo..............
Don't try this at home folks!! Running 12V fans at 5V is dangerous, they
have a habit of NOT starting reliably.
It may start OK when the lids off, but may not when it's back under the
TV... With possibly tragic results...
There are also adapters so you can dial down the fan voltages with a
little pot.
Yes, Zalman and others do these, it's the right way to do it, they use
'proper' pwm, so the fan gets the full 12V, but for a variable amount of
time... you can dial-in the right mix of 'loudness' vs 'throughput'...
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