Crist=F3v=E3o Dalla Costa wrote: > On 5/17/07, Dwayne Reid wrote: >> Yikes! >> >> I'm glad you haven't been hurt by this. >> >> Yeas - its obvious. >> >> Here's the deal. Your computer and probably much >> of your mains-powered test equipment is grounded >> to the AC mains ground. When you connect the >> negative rail of your HV supply to ground, you >> are essentially shorting out either D7 or D8. > = > Hello > = > With nothing but the diodes and capacitors in the schematic I still > have trouble (can't connect the sides or smoke appears). No computer > connected, nothing else. > = > Am I still missing something? Possibly. Dwayne's explanation is right; but your circuit should work on = it's own with nothing attached. So maybe it did work right until you = attached something and then fried a diode. If, as Dwayne mentioned, D7 or D8 got shorted out, then D5 or D6 (or = both) might have easily been overloaded and either opened or shorted. Although you can replace them if they are bad, you won't be able to = connect up your computer to it safely. -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist