Clarification on SOZ total dissapation please.

Mark Hathaway · 24th November 2002, 01:29 AM

Howdy guys,

I'm about to embark on making 4 water cooled monoblock SOZ's at about 30 watts each.

I need some clarification on the total dissapation of the soz topology.

The soz pdf shows dissapation at about 24 times rms watt output, but others have put the number at 15 times.

Anyone who has built one, I'd love to hear your measurements.

Thanks,
Mark hathaway

Nelson Pass · 25th November 2002, 03:45 PM

The article contains a curve showing total dissipation
vs rated output, and from it you will see that the figure
is about 24 times.

Mark Hathaway · 27th November 2002, 05:59 AM

.

BrianGT · 27th November 2002, 06:24 AM

Quote:

Originally posted by Mark Hathaway
Howdy guys,

I'm about to embark on making 4 water cooled monoblock SOZ's at about 30 watts each.

I need some clarification on the total dissapation of the soz topology.

The soz pdf shows dissapation at about 24 times rms watt output, but others have put the number at 15 times.

Anyone who has built one, I'd love to hear your measurements.

Thanks,
Mark hathaway

I think that you are insane.... from the article:

"The prototype amplifier went up to 30W with 45v supply rails and drew about 700W per channel." I forget how inefficient the design is.

What kind of water cooling are you considering doing?

--
Brian

Mark Hathaway · 27th November 2002, 06:34 AM

5 gallons a minute water flow to a car intercooler with about 300cfm of air flowing through it.

Should keep the mosfets and resistors at about 16 degrees over ambient.

Will make the copper blocks to mount the mosfets and on, resistors are wire wound non inductive hollow ones, will run water through them. (done this before, it worked GREAT)

Mark

PedroPO · 27th November 2002, 11:38 AM

Why do you want so much power with this kind circuit? It's designed to be scalable but that doesn't mean that you should do it with 30W.

If I were you I would try it out first with say 10W and since you can water cool, go up to see if the power gain is with sound improvement.

I made a 5W SOZ and I'm scaling it to a 15W version to see if it is so much better.
I feel that the 5watter is pretty good!

Peter Huang · 28th November 2002, 02:12 AM

The procedure I test for SOZ is contrary to the one of PedroPO.
I made two mono 50W SOZ with heavy transformers and heatsinks and then test its sonic feature for a lower power setting by adjusting Varic.
I found that there is some difference at base frequency.
Finally, I settle on 10W rating.
Just for your reference.

24th November 2002, 01:29 AM	#1
Mark Hathaway diyAudio Member Join Date: May 2002 Location: Melbourne, Australia	Clarification on SOZ total dissapation please. Howdy guys, I'm about to embark on making 4 water cooled monoblock SOZ's at about 30 watts each. I need some clarification on the total dissapation of the soz topology. The soz pdf shows dissapation at about 24 times rms watt output, but others have put the number at 15 times. Anyone who has built one, I'd love to hear your measurements. Thanks, Mark hathaway

27th November 2002, 05:59 AM	#3
Mark Hathaway diyAudio Member Join Date: May 2002 Location: Melbourne, Australia	thanks Nelson (nt) .

27th November 2002, 06:34 AM	#5
Mark Hathaway diyAudio Member Join Date: May 2002 Location: Melbourne, Australia	water cooling 5 gallons a minute water flow to a car intercooler with about 300cfm of air flowing through it. Should keep the mosfets and resistors at about 16 degrees over ambient. Will make the copper blocks to mount the mosfets and on, resistors are wire wound non inductive hollow ones, will run water through them. (done this before, it worked GREAT) Mark

27th November 2002, 11:38 AM	#6
PedroPO diyAudio Member Join Date: Jan 2002 Location: Lisbon,Portugal	Why do you want so much power with this kind circuit? It's designed to be scalable but that doesn't mean that you should do it with 30W. If I were you I would try it out first with say 10W and since you can water cool, go up to see if the power gain is with sound improvement. I made a 5W SOZ and I'm scaling it to a 15W version to see if it is so much better. I feel that the 5watter is pretty good! __________________ Pedro Oliveira

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25th November 2002, 03:45 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	The article contains a curve showing total dissipation vs rated output, and from it you will see that the figure is about 24 times.

28th November 2002, 02:12 AM	#7
Peter Huang diyAudio Member Join Date: Jul 2002 Location: Taiwan	The procedure I test for SOZ is contrary to the one of PedroPO. I made two mono 50W SOZ with heavy transformers and heatsinks and then test its sonic feature for a lower power setting by adjusting Varic. I found that there is some difference at base frequency. Finally, I settle on 10W rating. Just for your reference.

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