Quote Originally Posted by HighFidelityGuy View Post
This is fascinating stuff!
Thanks Mark.
If only life was easy, a lot of people wouldn't be interested but thanks for the interest & the post! Take it from me that a lot will look & crawl under a rock & dismiss it all
Quote Originally Posted by Barry View Post
The two (half) secondary winding voltages of 117.2 and 119.0V, being in antiphase will simply add to give you 238.2v

I assume you are worried about any common-mode noise only cancelling out to 1.5% (= (119 -117.2)/119). Is this the distortion to which you refer? Have to confess I don't understand the power supply arrangements for the two amps in your circuit

Apropos, your protection circuit operating within 1us. I do believe that such a circuit can be built, but feel that because it is so fast, it would be tripping all of the time. The RFI and noise will be of the order of 100kHz to 1MHz and I'm sure dropout and over-voltage spikes can be of this order.

Following this thread with interest.
Hi Barry. I'm worried about the lack of pure balance forcing a current to run through the earth.

The circuit diagram was incredibly basic. If you understand about electronics you might understand this so you know where i'm going. I'll use a fast op amp to generate a square wave driven from the mains so in phase. I'll then filter this with something like a 24Db octave filter at a lower frequency (say 20Hz), this will result in a low distortion sign wave. I need to set the output voltage of this sign wave, so rather than using a compressor i'll create a circuit that alters the power supply to the square wave generator & keeps the AC waveform at a constant voltage. Phase shifting isn't a problem & i'll most likely need this after the filter.

The output from this will be in phase with the AC input to the transformers & so all i need to do is compare the clean AC generated signal to the output from the transformers. The amps will correct anything up to a certain frequency & that depends on the transformers in all honesty. It's a simple feedback network & will need to be SOT (set on test). I see no reason why up to 500Hz or beyond can't be corrected so we get a pure AC waveform rather than the 5%+ distortion cobblers that we are used to having supplied to our equipment. I might need to use 500W+ to do this but it's the little things that add up to make the big picture

You know that late night stuff when nearly everything is switched off & the whole system seems to open up? Well that's what i want all the time