nvd
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Cancellation into a small space is one thing. Cancellation
at all positions in a large room I don't hold much hope for.
There are fans that spec low noise levels, what about a
simple swap-out? If you have a bunch of fixed eqpt,
consider a squirrel cage blower and ducting to feed
multiple ones? Squirrel cage blowers are almost silent,
run forever, but an inconvenient form factor.
Squirrel cage
You surely noticed, that the original poster has given up his plan to apply active noise cancellation. Nevertheless, there's an interesting application example for Analog DSPs dedicated to noise cancellation for a server fan. Analog Devices: Analog Dialogue: Adaptively Cancelling Server Fan NoiseCancellation into a small space is one thing. Cancellation
at all positions in a large room I don't hold much hope for.
One solution is to use a resistor (about 1 or 2W). The other solution is to use voltages that are already available in your computer, these are 0 5v 12v. Like ceiling fan can connect 0 and 5v or 5v and 12v =7v to slow down the fan (assuming it is a 12v fan). Or you can buy a low RPM fan
one solution is to use a resistor (about 1 or 2W)
the other solution is to use voltages that are already available in your computer, these are 0 5v 12v.
you can connect 0 and 5v or 5v and 12v =7v to slow down the fan (assuming it is a 12v fan).
Or you can buy a low RPM fan
Alex
thanks. i may try the resistor. i am modifying tektronix and not sure of bus v avail.
I gave up when I discovered how difficult it was to remove the case. One could retrofit a "muffler" consisting of a padded air plenum to suppress the noise. Or wear some ear plugs. Or ignore it.
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