[time-nuts] more 5370B
Mark Sims
holrum at hotmail.com
Sat May 23 22:10:01 UTC 2009
Results from a quick test. A very quiet 12V, 150mA, 5 inch fan placed 2 inches from the heat sink dropped that 58C spot down to 40C. Not as much as I had expected. That hot spot is near the center of the outside fin of the heat sink.
Those inner fins between the transistors are quite a bit cooler... now the heat sink averages a pleasantly warm 34C instead of 50+C. It does look like adding an external fan would be beneficial.
I also tried a tiny 2", 12V, 100mA fan. It gave an overall temp of around 40C. Even though it is much smaller and about as noisy as the big fan, it produces a higher frequency whine that is rather annoying for such a small thing.
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