> 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
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
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/showthread.php?postid=1565412#post1565412
And I went back but didnt see any Zen schematics. Must have been in the B1 thread.
Uriah
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/showthread.php?postid=1565412#post1565412
And I went back but didnt see any Zen schematics. Must have been in the B1 thread.
Uriah
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
But if you wish to reproduce the results Nelson published, then you should build as in his article.
Patrick
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?
Member
Joined 2002
I see R14 by the IRFP240, but I do not see R13 by the IRFP9240. Perhaps I have just missed it.
Jim
Jim
The F5 kitsch amp runs on CRCs with 2 x 10kuF per rail.
A classic average PS lytic number for PP Class A power amps is 1000uF per continuous watt (8 Ohm, per channel)
The F5 PSRR isn't shattering, 40kuF/ch for 27W/8 average is a 50% higher value, plus the advantage of the additional CRC filtering.
A classic average PS lytic number for PP Class A power amps is 1000uF per continuous watt (8 Ohm, per channel)
The F5 PSRR isn't shattering, 40kuF/ch for 27W/8 average is a 50% higher value, plus the advantage of the additional CRC filtering.
Yeah, I saw they regulated supply that is touted in the F5 document that makes the rounds, and that is a dealbreaker... dropping 8V... 8x amount of amps = alot of heat very quickly... almost half as much dissipation as the amp itself...
Then I remembered the picture I saw on 6moons
Now if only someone could reverse engineer that one, as Nelson seems very secretive about it...
Then I remembered the picture I saw on 6moons
Now if only someone could reverse engineer that one, as Nelson seems very secretive about it...
Well, if putting schematics to downloadable manual is secret, then that is secret too.Nordic said:
Maybe it was an unfortunate choice of words...
I merely wanted some suggestions of what we are seeing... I suspect there is two of those resistors in series between each pair of caps on each rail...
I think Nelson knows by now those who can afford to, buy, the rest of us try the best interpretations of what looks obvious...
I merely wanted some suggestions of what we are seeing... I suspect there is two of those resistors in series between each pair of caps on each rail...
I think Nelson knows by now those who can afford to, buy, the rest of us try the best interpretations of what looks obvious...
Manual is free for everybody (no need to puchase, even if
I would like to get one) from First Watt site:
http://www.firstwatt.com/products/f5.htm
Link to manual at bottom of that page.
I would like to get one) from First Watt site:
http://www.firstwatt.com/products/f5.htm
Link to manual at bottom of that page.
I have it, but it contains a regulated supply, that needs a huge heatsink.
wait, I take it back, you have the right one... THANKS
wait, I take it back, you have the right one... THANKS