paralleled rectifiers for +/-v ? - diyAudio
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Old 21st May 2006, 05:37 AM   #1
snkby is offline snkby  United States
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Default paralleled rectifiers for +/-v ?

can someone tell me why i cant/shouldnt do this ?

i want to make a +/-vdc supply but do not have the center-tapped xformer that would be ideal.

so why cant i parallel 2 rectifiers in-phase and series their +/-vdc outputs then feed a pair of series-caps the +/-vdc from the rectifiers ?

the ground reference would be the series-point of the rectifiers and the series-point of the caps.

thanks.
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Old 21st May 2006, 06:56 AM   #2
lndm is offline lndm  Australia
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It must be done the right way or you will inadvertently short your winding. The closest good thing I can think of is the voltage doubler.

http://hyperphysics.phy-astr.gsu.edu...c/voldoub.html

for example.
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Old 21st May 2006, 05:17 PM   #3
snkby is offline snkby  United States
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Default thanks indm ! but i still

dont understand why/how the windings might get shorted.

i know i did this once before a long time ago and it worked but i either had to reverse the polarity of the ac at 1 of the rectifiers or i had to keep the same polarity at both rectifiers i dont remember exactly which way it was.

i do remember that 1 of the ways the xformer started to buzz loudly and i had to disconnect immediately.

can you tell me how i might *inadvertently* short the windings ?

arent the xformer windings being isolated by the rectifiers ?

might try it today with a cheapy wallwart and see what happens.
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Old 21st May 2006, 10:06 PM   #4
lndm is offline lndm  Australia
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If you build a standard voltage doubler, you'll have no problem. The way you described it, I imagined this (ignore the dots):
____D__
(\
(..\
(...D
(___\___
|
|
|
|______

With limited info it was a wild guess.
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Old 23rd May 2006, 03:24 PM   #5
cpemma is offline cpemma  United Kingdom
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Default Re: thanks indm ! but i still

Quote:
Originally posted by snkby
...can you tell me how i might *inadvertently* short the windings ?

arent the xformer windings being isolated by the rectifiers?
Click the image to open in full size.

I'm sure if it could be done so easily it would be done a lot.
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