What to do with two 30V,50A transformer???

Leolabs · 22nd May 2007, 01:09 AM

Build a BTL design or a multichannel set???

FastEddy · 22nd May 2007, 02:07 AM

150 volt/amps ... assuming center tap, +/- 30 VAC, perfect for a single channel 150 watt amp ...

MJL21193 · 22nd May 2007, 02:29 AM

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 · 22nd May 2007, 02:50 AM

Quote:

Originally posted by MJL21193

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

You miss one zero, 60 X 50 = 3000 VA

Eva · 22nd May 2007, 02:51 AM

30V * 50A = 3000W

Leolabs · 22nd May 2007, 02:55 AM

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 · 22nd May 2007, 02:58 AM

Quote:

Originally posted by Chartal

You miss one zero, 60 X 50 = 3000 VA

Ooops! My boo-boo.

MJL21193 · 22nd May 2007, 03:01 AM

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.

FastEddy · 22nd May 2007, 03:56 AM

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?)

sam9 · 22nd May 2007, 04:22 AM

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.

22nd May 2007, 01:09 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, 02:07 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

22nd May 2007, 02:51 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, 03:56 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

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22nd May 2007, 02:55 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.

22nd May 2007, 04:22 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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