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hannahs radios · 30th May 2020, 11:24 pm

Having reread this topic again reminds me of something I noticed that happened a few years ago. I have a large 25 amp 13.8 volts PSU using a conventional transformer. I've had it since it was new it hums quietly, except once or twice I noticed that it was rattling a bit and at the same time there was a noise on my radio like a thermostat opening. As soon as it had opened the physical noise from the PSU stopped. I opened it up and checked inside, there arw no thermostats in the PSU in fact the only switch is the mains on/off there's no electronics in the primary side.

Does anyone have any thoughts what might have caused it to rattle like that?

30th May 2020, 11:24 pm	#59
hannahs radios Hexode Join Date: Jan 2012 Location: Weymouth, Dorset, UK. Posts: 422	Re: How much DC on your mains ? Having reread this topic again reminds me of something I noticed that happened a few years ago. I have a large 25 amp 13.8 volts PSU using a conventional transformer. I've had it since it was new it hums quietly, except once or twice I noticed that it was rattling a bit and at the same time there was a noise on my radio like a thermostat opening. As soon as it had opened the physical noise from the PSU stopped. I opened it up and checked inside, there arw no thermostats in the PSU in fact the only switch is the mains on/off there's no electronics in the primary side. Does anyone have any thoughts what might have caused it to rattle like that?