Transformerless Audio Amplifier

[rbroich]

Hi everyone,

I was just wondering if it would be possible to design a class AB audio amplifier which is powered directly from 220V AC via a diode bridge. (and obviously rather large capacitors...)

For example Rod Elliott's project 117 uses dual rail 135V. [http://sound.westhost.com/project117.htm]
If one would modify this to work with a single rail 270V DC supply, would this transformer less option be viable?

Many transistors (including the MJL4281) can support up to 350V, so the maximum voltage ratings shouldn't be a problem...Any comments?

Regards,
Rene

[Steve Eddy]

Originally posted by rbroich
I was just wondering if it would be possible to design a class AB audio amplifier which is powered directly from 220V AC via a diode bridge. (and obviously rather large capacitors...)

If I'm not mistaken, it is an unwritten rule here that discussing direct powering from the AC mains is prohibited.

se

[SY]

Indeedy-do. This sort of thing is DEADLY DANGEROUS. Although I have no personal objections to a Darwinian cleansing of the gene pool, inevitably it's someone other than the constructor who gets electrocuted. And I hate the idea of the inevitable lawyers shutting us down for allowing people to discuss things we know are insanely dangerous.