Need a transformer

fschris · 31st January 2011, 09:30 PM

Noob Here ... I bought this plate amplifier that needs a transformer. I only know when I purchased that is was a 500W amplifier from a company this is out of business.

Could I buy some sort of TOROIDAL TRANSFORMER on ebay ?

I have a couple pics. I am no electrical engineer pro but I understand basic electronics to some degree. I am looking to learn more as a hobby.

I Was looking at something like this ?

Trans on ebay

MJL21193 · 31st January 2011, 09:46 PM

Hi Noob,
That transformer doesn't have a high enough secondaty voltage or a high enough VA (volt - amps) rating to get you that 500 watts.
To get 500 watts on a 4 ohm speaker, you need at least +/-60VDC rails, or a 43-0-43 AC transformer and it would need to be ~500VA.

fschris · 31st January 2011, 09:51 PM

So I need something like this...

Bigger...

MJL21193 · 31st January 2011, 11:02 PM

Here: Antek - AN-5445

These are good transformers.

Minion · 11:23 PM

A lot of amps that claim to be 500w aren"t really 500w so I wouldn"t go connecting a 43v 0v 43v transformer up to it without being sure what voltage it is supposed to run at as you might blow a fuze or a bunch or capacitors if you connect too high a voltage to it .....

What is the voltage rating of the big caps in the power supply ??

It looks like you need a transformer with 2 different voltages , +/-15v and whatever is used for the power amp .....

MJL21193 · 1st February 2011, 12:57 AM

Excellent points Minion, but short of packing it up and sending up here to me, there is no way to cover all the bases. He says 500 watts, he says transformer.

fschris · 1st February 2011, 01:11 AM

Quote:

Originally Posted by Minion

A lot of amps that claim to be 500w aren"t really 500w so I wouldn"t go connecting a 43v 0v 43v transformer up to it without being sure what voltage it is supposed to run at as you might blow a fuze or a bunch or capacitors if you connect too high a voltage to it .....

What is the voltage rating of the big caps in the power supply ??

It looks like you need a transformer with 2 different voltages , +/-15v and whatever is used for the power amp .....

I agree those advertised 500 Watts are based on some pretty loose calculations! What would be the safer route? Thanks for that antek link. I will purchase something from them.

MJL21193 · 1st February 2011, 01:17 AM

More info. More pics. Name of the company that made it, model number, etc.

fschris · 1st February 2011, 01:20 AM

it was sold by av123... now defunct. made for the UFW-10 subwoofer.

here is a link to my sky drive with pics.

AMP - Windows Live

MJL21193 · 1st February 2011, 01:34 AM

You don't have the unit?

31st January 2011, 11:21 PM	#5
Minion diyAudio Member Join Date: May 2006	A lot of amps that claim to be 500w aren"t really 500w so I wouldn"t go connecting a 43v 0v 43v transformer up to it without being sure what voltage it is supposed to run at as you might blow a fuze or a bunch or capacitors if you connect too high a voltage to it ..... What is the voltage rating of the big caps in the power supply ?? It looks like you need a transformer with 2 different voltages , +/-15v and whatever is used for the power amp ..... Last edited by Minion; 31st January 2011 at 11:23 PM.

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31st January 2011, 09:46 PM	#2
MJL21193 Account disabled at member's request Join Date: Mar 2007	Hi Noob, That transformer doesn't have a high enough secondaty voltage or a high enough VA (volt - amps) rating to get you that 500 watts. To get 500 watts on a 4 ohm speaker, you need at least +/-60VDC rails, or a 43-0-43 AC transformer and it would need to be ~500VA.

31st January 2011, 09:51 PM	#3
fschris diyAudio Member Join Date: Jan 2011	So I need something like this... Bigger...

31st January 2011, 11:02 PM	#4
MJL21193 Account disabled at member's request Join Date: Mar 2007	Here: Antek - AN-5445 These are good transformers.

1st February 2011, 12:57 AM	#6
MJL21193 Account disabled at member's request Join Date: Mar 2007	Excellent points Minion, but short of packing it up and sending up here to me, there is no way to cover all the bases. He says 500 watts, he says transformer.

1st February 2011, 01:17 AM	#8
MJL21193 Account disabled at member's request Join Date: Mar 2007	More info. More pics. Name of the company that made it, model number, etc.

1st February 2011, 01:20 AM	#9
fschris diyAudio Member Join Date: Jan 2011	it was sold by av123... now defunct. made for the UFW-10 subwoofer. here is a link to my sky drive with pics. AMP - Windows Live

1st February 2011, 01:34 AM	#10
MJL21193 Account disabled at member's request Join Date: Mar 2007	You don't have the unit?

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