From that; all problems including my back pain are all from the power line.I did some reading on balanced power supplies
Your mains supply is the same as the UK, though I think you mean, 'live and neutral' rather than 'live and mains'.My house is single phase (like most free standing single houses in Australia), so I get live and mains.
Can you explain what is producing the hum: HiFi system, TV, computer... ? Is it hum on an audio signal or is it a hum from some other equipment: air conditioning, cooker, vacuum cleaner... ?Yes, there is trouble with hum.
I see, current at centre tap is zero.
And the RCD sees the primary winding of the transformer anyway.
The transformer just has to be perfectly symmetrical.
Then the problem is if I plug CD players and the amp on the other side, where to connect the signal ground to.
If you suspect a bad ground connection, douse the ground thoroghly with a garden hose.if feed DC in fom a lab power supply its all quiet, but as soon as I plug the power cable into the housing, the noise is back. Its not actually a pure 50Hz hum, more a scratching noise, 50Hz with lots of over tones. The housing has a ground connection, one of these 3 pronged ones like PCs.
Suppose thats why the osci would not show anything, hangs on the same messy ground.
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