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ac - Isolated audio without a transformer - Electrical ...
https://electronics.stackexchange.com/questions/450515/isolated-audio-without-a-transformer#:~:text=If%20you%20really%20wish%20to%20not%20use%20a,is%20to%20isolate%20both%20the%20ground%20and%20power.
POWER AMPLIFIER WITHOUT TRANSFORMER - Justia
https://patents.justia.com/patent/20160352291
The audio isolator is used to isolate audio-source input end and the amplifier for making the amplifier directly connected to utility power via the rectifier without transformer to increase transformation efficiency and decrease weight …
ac - Isolated audio without a transformer - Electrical ...
https://electronics.stackexchange.com/questions/450515/isolated-audio-without-a-transformer
If you really wish to not use a transformer, one possible solution is to use a isolation power supply for your amplifier circuit. However, your design is not going to work because you didn't isolate the ground. The whole point of using an isolated power supply is to isolate both the ground and power.
70V/100V line D class amplifier without a step-up transformer
https://www.diyaudio.com/community/threads/70v-100v-line-d-class-amplifier-without-a-step-up-transformer.214273/
It's good to have no transformer in the amplifier (less losses, less weight, better impedance curve), but do treat your load as a complex one. Consider a Zobel network in the amp side. Best regards,
amplifier with no transformer | Electronics Forum ...
https://www.electro-tech-online.com/threads/amplifier-with-no-transformer.37337/
So it should then be possible to construct a crazy-wattage audio amp (3000+ Watts?) without a transformer (i.e. the most expensive component) if you use the 240V mains (U.S.A.) on a dedicated pair of circuit breakers and directly rectify the mains voltage so you can have a split supply.
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