On 7/17/06, Russell McMahon wrote: > The biggest lesson is, discharge capacitors proactively. In my > enthusiasm to troubleshoot I could have died. 1600 uF at 400V is very > very lethal. I know very well the dangers of charged capacitors. > > Lesson 2 is discharge caps with an appropriate wattage and resistance > resistor. > A good lesson... Some years ago I was a student doing some tests for a step up DC-DC converter. I was using a small DC motor as the load. Normally I connected the load before I switched on the main power. So all went well. One day I happened to switched on the main power first. Then I realized that the load was not connected. So I switched off the main power and tried to connect the load. I got electric-shocked by the remaining charge in the output capacitor. It was really painful and I remembered my hair became straightly up. My friends told me it was very cool hair style... Regards, Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist