What to do with two 30V,50A transformer???
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 22nd May 2007, 02:09 AM #1 Leolabs   diyAudio Member     Join Date: Dec 2004 Location: Bukit Mertajam What to do with two 30V,50A transformer??? Build a BTL design or a multichannel set???
 22nd May 2007, 03:07 AM #2 FastEddy   diyAudio Member     Join Date: Jun 2006 Location: North Californie 150 volt/amps ... assuming center tap, +/- 30 VAC, perfect for a single channel 150 watt amp ... __________________ Over compression is a problem with modern CD recordings [recent changes]
MJL21193
Account disabled at member's request

Join Date: Mar 2007
Quote:
 Originally posted by FastEddy 150 volt/amps ... assuming center tap, +/- 30 VAC,

+/- 30 volts would be 60 x 50 = 300VA.

PS: If you don't need it, I'll take it

Chartal
diyAudio Member

Join Date: Nov 2004
Location: Montreal
Quote:
 Originally posted by MJL21193 +/- 30 volts would be 60 x 50 = 300VA.

You miss one zero, 60 X 50 = 3000 VA

 22nd May 2007, 03:51 AM #5 Eva   diyAudio Member     Join Date: Oct 2003 Location: Near the sea 30V * 50A = 3000W __________________ I use to feel like the small child in The Emperor's New Clothes tale
 22nd May 2007, 03:55 AM #6 Leolabs   diyAudio Member     Join Date: Dec 2004 Location: Bukit Mertajam Yes.Two 30-0V with 50A each.Weight more than 20kgs each and they are EI transformers. 1500VA x 2,but have no idea to use them properly.
MJL21193
Account disabled at member's request

Join Date: Mar 2007
Quote:
 Originally posted by Chartal You miss one zero, 60 X 50 = 3000 VA

Ooops! My boo-boo.

MJL21193
Account disabled at member's request

Join Date: Mar 2007
Quote:
 Originally posted by Leolabs Yes.Two 30-0V with 50A each.Weight more than 20kgs each and they are EI transformers. 1500VA x 2,but have no idea to use them properly.

Too big for your needs? Just because they can supply 50A, doesn't mean you have to have something that can draw that much. For an amp, you are limited by the speakers impedance and the voltage.
Would be great for a 6-8 channel amp, though.
Or, sell it on Ebay.

 22nd May 2007, 04:56 AM #9 FastEddy   diyAudio Member     Join Date: Jun 2006 Location: North Californie Too bad ... 0 to 30 VAC with no center taps and 3k watts ... probably used for an old computer server or such. Not much good for audio unless, as suggested, you want to do multiple amps in one chassis. ... like four or five channels of 100 watts / each MOSFET amp = a difficult design as quality goes down with lower supply voltages and 0-30 VAC will also require a significant split gound simulation to get +21 /0/- 21 VDC ... (Sorry about that multiply error = a senior moment?) __________________ Over compression is a problem with modern CD recordings [recent changes]
 22nd May 2007, 05:22 AM #10 sam9   diyAudio Member     Join Date: Jun 2002 Location: Left Coast If my (hopefully conservative) calculations are right: Take two 0-30V transformers and wire them in series so that you get one 30-0-30. VA = 2 x (50x30)= 3000VA (I think VA works that way). Unless you are going to get into voltage doublers, this will let you power a number of ~80W (nominal 8 ohm load) amplifiers. Easily 7 channels of amplification with current to spare. If you wanted to try a voltage doubler (big diodes suggested) you could power 5 channels at 350 Watts with just enough left over to handle 4 ohm speakers. Add some big heat sinks and get a big friend, or hand truck to move these around.

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