Tweakers' Asylum

RE: VCAPs break in approach

222.127.228.7

GTCharlie

In Reply to: RE: VCAPs break in approach posted by oris98 on July 25, 2007 at 16:45:08

there are commercial "cap cookers" But what I did was run them across speaker terminals of a "detuned tuner" to produce white noise. My small transistor radio gives out less than a volt of white noise AC. I also rigged up a bridge rectifier (of the poorest quality) straight out of the wall, to produce a scraggly 120Hz or so of signal. Am also thinking of putting in a transformer right after the rectifier, at some future weekend. That should produce pure AC of substantial voltage. Hope this helps.

Follow Ups:

Oh my... - Tweekeng 21:53:39 07/25/07 (2)
I also rigged up a bridge rectifier (of the poorest quality) straight out of the wall, to produce a scraggly 120Hz or so of signal.
You had better be careful here. Directly rectifying AC line voltages is serious business. You come in contact with that high of a DC voltage with no current limit besides a 15 amp service breaker, it may be the last thing you ever do.
Am also thinking of putting in a transformer right after the rectifier, at some future weekend. That should produce pure AC of substantial voltage. Hope this helps.
Think again, placing a transformer after a rectifier will produce nothing except for possibly some smoke.

Edits: 07/25/07 07/25/07
- RE: Oh my... - GTCharlie 16:38:09 07/26/07 (1)
  thanks for the warning/reminders ... hehehe. am "cooking" 600v and 1,000v plus capacitors in my bridge. and if I should opt later to install a transformer after the bridge, I'd but a blocking capacitor.
  - But... - tweakeng 14:10:26 07/27/07 (0)
    a blocking cap is not going to do anything either.
    
    Sure that will block DC but it will also leave you something a long way from the pure AC of substantial voltage you think you are going to get.
    
    Use a stepup transformer powered directly from 120VAC to produce your HVAC then rectify it with some decent HV rectifiers.

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