Please help to understand this article on PSUs

A Sanchez · 27th October 2009, 03:11 PM

Hi,

I have been reading this interesting and, I believe, well known article from TNT:

Solid State Power Amplifier Supply Part 2

and I am struggling to figure our which is the transformer's secondary windings voltage recommended by the author under his example. Is it 20V?. He mentions 20 Vrms but I am not sure what he is taking about.

Your help will be greatly appreciated.

Regards
Antonio

Steve Dunlap · 27th October 2009, 04:19 PM

He is talking about a 50W at 8 ohms amp. That is where the 20V RMS comes from. You would need two transformers (for the example he gives) with a secondary voltage of roughly 24V each.

A Sanchez · 27th October 2009, 06:14 PM

Steve,

Thanks for your prompt reply.

Yes, I am planning to use two separate transformers.

Since my speakers' impedance is 6 Ohms (Jordan JX92S and Aurum Cantus 2Si), if I understand correctly I would be fine with 22V (or maybe 20V?) secondaries.

Thanks again

Antonio

Steve Dunlap · 27th October 2009, 07:36 PM

Yes, you can use those voltages. The 20V transformer will give you about 46W at 6 ohms. 22V will give 54W at 6 ohms.

A Sanchez · 27th October 2009, 08:54 PM

Quote:

Originally Posted by Steve Dunlap

Yes, you can use those voltages. The 20V transformer will give you about 46W at 6 ohms. 22V will give 54W at 6 ohms.

Last question Steve

What would you choose in this case- 20V or 22V- if your priority was a better sound- not necessarily high volume per se?

Thanks a lot.

Steve Dunlap · 27th October 2009, 09:21 PM

You are not likely to hear any difference. I would let price and availability be the deciding factor.

27th October 2009, 03:11 PM	#1
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	Please help to understand this article on PSUs Hi, I have been reading this interesting and, I believe, well known article from TNT: Solid State Power Amplifier Supply Part 2 and I am struggling to figure our which is the transformer's secondary windings voltage recommended by the author under his example. Is it 20V?. He mentions 20 Vrms but I am not sure what he is taking about. Your help will be greatly appreciated. Regards Antonio

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27th October 2009, 04:19 PM	#2
Steve Dunlap diyAudio Member Join Date: Sep 2008 Location: Here	He is talking about a 50W at 8 ohms amp. That is where the 20V RMS comes from. You would need two transformers (for the example he gives) with a secondary voltage of roughly 24V each.

27th October 2009, 06:14 PM	#3
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	Steve, Thanks for your prompt reply. Yes, I am planning to use two separate transformers. Since my speakers' impedance is 6 Ohms (Jordan JX92S and Aurum Cantus 2Si), if I understand correctly I would be fine with 22V (or maybe 20V?) secondaries. Thanks again Antonio

27th October 2009, 07:36 PM	#4
Steve Dunlap diyAudio Member Join Date: Sep 2008 Location: Here	Yes, you can use those voltages. The 20V transformer will give you about 46W at 6 ohms. 22V will give 54W at 6 ohms.

27th October 2009, 09:21 PM	#6
Steve Dunlap diyAudio Member Join Date: Sep 2008 Location: Here	You are not likely to hear any difference. I would let price and availability be the deciding factor.

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