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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Rectification.... posted by Gepetto on April 4, 2002 at 17:46:22:
The DO-41 package is good only up to 1 amp and 100 volts. Using a rule of thumb of 2.6 or 3 times the input (49.1 volts ac) for the PIV required, it is necessary to go to the 200 volt Schottky (TO-220 package/10 amps).The noise for the preamp is coming from the xformer/diodes due to the diodes. The circuit had additional half wave rectification (two sets of two diodes) that I immediately had to remove the Schottky's due to oscillations that blew the fuse. The full wave rectification works but causes the xformer/diodes to hum.
The hum coming through the speakers is volume independent, and I believe comes from the amp itself (which uses 4 sets of full wave rectifiers).
My concern is that the vibrations from the unhappy xformers may wear the wire insulation over a period of time and cause an internal xformer short.
I have no means of posting the schematic, but I would be happy to email it to you.
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Follow Ups
- MBR20200 is the only known 200 volt Schottky... - Monolith 17:58:44 04/04/02 (5)
- Email me the schematic... - Gepetto 18:12:32 04/04/02 (4)
- Re: Email me the schematic... - Gepetto 17:02:06 04/05/02 (3)
- Re: Email me the schematic... - Monolith 18:27:24 04/05/02 (2)
- Diodes there are fine... - Gepetto 18:51:10 04/05/02 (1)
- Re: Diodes there are fine... - Monolith 18:54:49 04/05/02 (0)
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