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It's definately the PSU, not a fan.


Yeah, it is. It's a voltage thing, IIRC. At 110v, there's no whine. At 240v, there is. Or maybe it's a 50Hz/60Hz thing. The PSUs that we used in the pre-production units worked fine, but they changed something for the production run, and only tested it in the US.

You might be able to fix it by replacing one of the components on the PSU, but I don't know which one. My Central and the replacement PSU are in the attic right now, so I can't easily check.

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A PC PSU is too big, i think. The best would be if i could find the original one from an electronics-supplier.


I think it's a custom-built PSU. A small PC power supply ought to work, I think. Unless you also need 3.3v. I don't recall.
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-- roger