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thanks for reference. I looked at it and respectfully point out that this is an example of mis-placed technology, like
putting a bilge pump under a leaky faucet when you should just fix the faucet, or adding a second engine to a car
when the original just needs fixing. Fan noise happens because...
a swap out would be ok, with low rpm fan. need to find a low noise fan. i think someone here or on eevblog swapped a fan in his Rigol scope. worth looking for hot spots while the case is off.
jb
thanks. i may try the resistor. i am modifying tektronix and not sure of bus v avail.
i am also considering a very low rpm fan internal to the piece of equipment and shutting off the exhaust fan.
probably better to have exhaust idling gently though. I just peeked into the grill and fan is 12v...
you can google this. I saw chinese researchers do a simple strip line gang of transistors, i think it was called a marx circuit, but cant remember. the transistors are avalanche biased, and the whole thing pulses rapidly when triggered. they were doing 1000 v as i remember. cheap and simple and...
interface not ipad friendly, or vice versa, so please ignore typos, etc. :)
active noise cancellation is tricky and expensive. simpler solution is to lower rpm of fan and get rid of noisy turbulence. Will this over heat the supply?
There are two aspects to cooling electronics. one is gross...
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