F5 power amplifier - Page 163

EUVL · 15th August 2008, 04:59 PM

> every one that did, now have a stack of flat batteries

Have you not heard of Optima Yellow Deep Discharge Lead Acid Batteries (75Ah) ?

We run our Aleph-X 100W with two of those, per monoblock.

Patrick

udailey · 15th August 2008, 05:29 PM

Patrick might be able to help Audioholik with his voltage question. I believe his F5 is running 16V rails.?.
Of course he is running his own balanced version but might have some good input.
Also, looks like Fredlock is getting 22V rails http://www.diyaudio.com/forums/showt...12#post1565412
And I went back but didnt see any Zen schematics. Must have been in the B1 thread.
Uriah

EUVL · 15th August 2008, 08:36 PM

As posted umteen posts ago, the balanced version I built runs on +/-16V rails, and is biased at 2A per MOSFET. No problems with 16V as far as I am concerned.

But if you wish to reproduce the results Nelson published, then you should build as in his article.

Patrick

Nordic · 16th August 2008, 10:57 AM

Attached is what I deem to be corrections regarding the fets that where pointed out. Maybe someone could just double check...

flg · 16th August 2008, 02:24 PM

I could be wrong, and I suppose it would be easier to look it up than argue, but, I'll stick my neck out with this suggestion: I seem to remember most of the FirstWatt units are using an 18-18 250VA transformer?

JimT · 16th August 2008, 04:16 PM

R14 on the IRFP924 has holes, but is not marked.

Quote:

Originally posted by Nordic
Attached is what I deem to be corrections regarding the fets that where pointed out. Maybe someone could just double check...

jleaman · 16th August 2008, 04:28 PM

Looks pretty good, i like the layout, The output fets on one side, is a key idea.

Nordic · 16th August 2008, 04:31 PM

Jim, I don't see the error you mention, everything looks connected...

JimT · 16th August 2008, 04:38 PM

I see R14 by the IRFP240, but I do not see R13 by the IRFP9240. Perhaps I have just missed it.

Jim

jacco vermeulen · 16th August 2008, 04:48 PM

R13 is placed horizontal, under the thermistor.

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15th August 2008, 04:59 PM	#1621
EUVL diyAudio Member Join Date: Oct 2003	> every one that did, now have a stack of flat batteries Have you not heard of Optima Yellow Deep Discharge Lead Acid Batteries (75Ah) ? We run our Aleph-X 100W with two of those, per monoblock. Patrick

15th August 2008, 05:29 PM	#1622
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	Patrick might be able to help Audioholik with his voltage question. I believe his F5 is running 16V rails.?. Of course he is running his own balanced version but might have some good input. Also, looks like Fredlock is getting 22V rails http://www.diyaudio.com/forums/showt...12#post1565412 And I went back but didnt see any Zen schematics. Must have been in the B1 thread. Uriah

15th August 2008, 08:36 PM	#1623
EUVL diyAudio Member Join Date: Oct 2003	As posted umteen posts ago, the balanced version I built runs on +/-16V rails, and is biased at 2A per MOSFET. No problems with 16V as far as I am concerned. But if you wish to reproduce the results Nelson published, then you should build as in his article. Patrick

16th August 2008, 02:24 PM	#1625
flg diyAudio Member Join Date: Jul 2005 Location: North East	I could be wrong, and I suppose it would be easier to look it up than argue, but, I'll stick my neck out with this suggestion: I seem to remember most of the FirstWatt units are using an 18-18 250VA transformer?

16th August 2008, 04:28 PM	#1627
jleaman Banned Join Date: Apr 2002	Looks pretty good, i like the layout, The output fets on one side, is a key idea.

16th August 2008, 04:31 PM	#1628
Nordic diyAudio Member Join Date: Sep 2005	Jim, I don't see the error you mention, everything looks connected...

16th August 2008, 04:38 PM	#1629
JimT diyAudio Member Join Date: Oct 2004 Location: Waterloo	I see R14 by the IRFP240, but I do not see R13 by the IRFP9240. Perhaps I have just missed it. Jim

16th August 2008, 04:48 PM	#1630
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	R13 is placed horizontal, under the thermistor.