Yes; I guess when I think about it you would need about 240 VDC across the CS Pair or perhaps bridge the output; taking the output from the common emitters. I knew that someone would be sure to point out the pitfalls. That's a good thing. And important. It is true that the output will be less than the input, but what essentially is wrong with the idea of converting the DC to AC; assuming that the proper voltages could be achieved? I know that the heat generated will be significant. I can't imagine any significant harmonics. At least none that cannot be trapped. I'm curious? ----- Original Message ----- From: "Olin Lathrop" To: "Microcontroller discussion list - Public." Sent: Thursday, August 07, 2008 2:54 PM Subject: Re: [EE] affordable full range 20+4 ATX power supply that mayworkon120V DC? > John Coppens wrote: >>> If you design a 50-60 Hz sinusoidal generator and feed it to an op amp >>> and then to a complementary symmetry pair and take the output from the >>> common emitters, then, if you put the 120 VDC across the collectors >>> (PNP to the minus side) you should get 120 VAC output between the >>> collector of the PNP complement and the emitter junction. >> >> You'd get 85V AC. Remember AC is specified as RMS - so the peaks of AC >> are 1.41 times greater, > > But they extend both positive and negative. From the center of the AC > signal the peaks would be +60 and -60, which is 42V RMS for a sine wave. > > > ******************************************************************** > Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products > (978) 742-9014. Gold level PIC consultants since 2000. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist