Did I get the right Transformer?

charliemopps · 03:42 PM

I got this kit:

1 LM3886TF amplifier AMP+RECTIFIER FILTER BOARD DIY KIT | eBay

and ordered this transformer for it:
http://www.antekinc.com/details.php?p=688

I just want to make sure I got the correct transformer. I know it's over powered, but that's just because I want to add a sub amp later on.

Any help would be great, thanks! (yea, yea, I should have asked before I ordered, but I thought I'd picked correctly and now I'm having doubts)

Mooly · 11th October 2012, 03:40 PM

Both links seem to bring the same thing up. Amp but no tranny that I can see. What are the specs of the tranny ?

charliemopps · 03:59 PM

Quote:

Originally Posted by Mooly

Both links seem to bring the same thing up. Amp but no tranny that I can see. What are the specs of the tranny ?

That was weird... but I fixed it. Try the link now.

http://www.antekinc.com/details.php?p=688

sreten · 11th October 2012, 05:21 PM

Hi, dual 24VAC 300VA will be fine, rgds, sreten.

Mooly · 11th October 2012, 06:16 PM

Agreed...

charliemopps · 11th October 2012, 07:27 PM

How much more VA/Watts can I run off that transformer without a problem? I want to add a sub later on. Could I get away with another 60 to 120 watts? I'm in the US with 120V 60hz, so according to their spec it should be rated at 360VA right? And what I've got now is 120watts... so 240 total on a 360 transformer?

Thanks for the help!

Mooly · 11th October 2012, 07:49 PM

In practice (meaning normal programme material) I think it will be fine.

Designing and specifying amps for continuous max rated output is a whole different ball game (and most commercial stuff isn't specified to be used like that either).

AndrewT · 12th October 2012, 01:58 PM

a 300VA transformer will give good to adequate per4formance when powering amplifier totally from 150W to 300W.

eg,
5off 60W amplifiers could work very well from a single 300VA transformer, if you choose the correct voltage and (much more difficult) get the grounding correct.

11th October 2012, 03:29 PM	#1
charliemopps diyAudio Member Join Date: Sep 2012	Did I get the right Transformer? I got this kit: 1 LM3886TF amplifier AMP+RECTIFIER FILTER BOARD DIY KIT \| eBay and ordered this transformer for it: http://www.antekinc.com/details.php?p=688 I just want to make sure I got the correct transformer. I know it's over powered, but that's just because I want to add a sub amp later on. Any help would be great, thanks! (yea, yea, I should have asked before I ordered, but I thought I'd picked correctly and now I'm having doubts) Last edited by charliemopps; 11th October 2012 at 03:42 PM.

11th October 2012, 03:40 PM	#2
Mooly diyAudio Moderator Join Date: Sep 2007	Both links seem to bring the same thing up. Amp but no tranny that I can see. What are the specs of the tranny ? __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

11th October 2012, 05:21 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, dual 24VAC 300VA will be fine, rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

11th October 2012, 06:16 PM	#5
Mooly diyAudio Moderator Join Date: Sep 2007	Agreed... __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

11th October 2012, 07:49 PM	#7
Mooly diyAudio Moderator Join Date: Sep 2007	In practice (meaning normal programme material) I think it will be fine. Designing and specifying amps for continuous max rated output is a whole different ball game (and most commercial stuff isn't specified to be used like that either). __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*


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11th October 2012, 07:27 PM	#6
charliemopps diyAudio Member Join Date: Sep 2012	How much more VA/Watts can I run off that transformer without a problem? I want to add a sub later on. Could I get away with another 60 to 120 watts? I'm in the US with 120V 60hz, so according to their spec it should be rated at 360VA right? And what I've got now is 120watts... so 240 total on a 360 transformer? Thanks for the help!

12th October 2012, 01:58 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	a 300VA transformer will give good to adequate per4formance when powering amplifier totally from 150W to 300W. eg, 5off 60W amplifiers could work very well from a single 300VA transformer, if you choose the correct voltage and (much more difficult) get the grounding correct.

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