I see the posters thread was locked for talking about transformerless work with AC. I don't understand Why he would be thinking about using any AC inputs at all when his first sentence was "I have a 200v 15amp DC powersupply" He even listed the "SSR" as one of the items in his tranformerless circuit idea. I would think he should try to 'pulse' the output from his 200V power supply using a DC rated SSR. A simple 555 timer probably could be built to run the SSR and switch the DC supply voltage at whatever speed he wanted. And for the matter of transformerless circuits being dangerous, I would think 200VDC would be just as bad if not worse when it can give you a full 15 amps. Talk about AC being dangerous, Whew. Hey let's drop these leads into some highly conductive wet liquid stuff and then let's put lots of highly conductive metal in there with it and then let's apply 200VDC to it. That's called electrolysis, but unless he's working at a factory doing tons of the stuff at one time, I've never heard of anyone using more than about 20 volts to do home hobby style electroplating.