What to do with two 30V,50A transformer??? - diyAudio
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Old 22nd May 2007, 01:09 AM   #1
Leolabs is offline Leolabs  Malaysia
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Question What to do with two 30V,50A transformer???

Build a BTL design or a multichannel set???
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Old 22nd May 2007, 02:07 AM   #2
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150 volt/amps ... assuming center tap, +/- 30 VAC, perfect for a single channel 150 watt amp ...
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Old 22nd May 2007, 02:29 AM   #3
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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
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Old 22nd May 2007, 02:50 AM   #4
Chartal is offline Chartal  Canada
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Quote:
Originally posted by MJL21193

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

You miss one zero, 60 X 50 = 3000 VA
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Old 22nd May 2007, 02:51 AM   #5
Eva is offline Eva  Spain
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30V * 50A = 3000W
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Old 22nd May 2007, 02:55 AM   #6
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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.
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Old 22nd May 2007, 02:58 AM   #7
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Quote:
Originally posted by Chartal



You miss one zero, 60 X 50 = 3000 VA

Ooops! My boo-boo.
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Old 22nd May 2007, 03:01 AM   #8
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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.
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Old 22nd May 2007, 03:56 AM   #9
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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?)
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Old 22nd May 2007, 04:22 AM   #10
sam9 is offline sam9  United States
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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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