The end of the (upgrade) road?

Don't own any Techies now ;)

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Originally Posted by CageyH

You are forgetting that I changed the type of diode as well, for a faster acting type. When I replaced the capacitors, I did it with the board Insitu.
Nothing else was touched.

Just because I have not heard the hum does not mean it if fixed. It could just be an issue on the power network when everybody in the area has their heating switched on, polluting the mains. There are a lot of heat pumps in the area.

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I am unhappy to report that I heard the hum today. A really short burst, which repeated a few times, still around the same frequency, so the ne t step is going to be an isolation transformer. I am not going to mess around changing anything else out. I just need to find a safe unit at a price I am willing to pay.

I think this would work:
https://www.bronson-energy.com/shop/..._values=9%2C13

Looks like a tidy little unit for just a century.

By the time I try and make a safe one, it will be cheaper just to buy that one.

Not as safe as I want,

For safety reasons please consider to connect your devices to the isolation transformer via an RCD
(residual current device). RCDs are available as plug adapters as well as as switches.

I tried my Power Inspired AG1500 with my BB3.
It blew the fuse in the BB3, so I think the AG1500 is officially dead.
As the AG1500 is basically a double conversion UPS without a battery, I may look at getting a double conversion UPS.
It is either that, or a balanced mains transformer with an RCD device.

I am going to try one more inexpensive mod before I splurge.
I am going to fit a ground loop breaker circuit to the "floating" 0V HV input on my BB3.

Good luck :)

I think I will need it.