F5 power amplifier - Page 30

Zen Mod · 23rd April 2008, 10:04 PM

Quote:

Originally posted by Dougie085
Yeah I looked he didn't have anything listed that would work.

http://tiny.pl/ngd2

look for 12,000Mfd/50V ; 15,000Mfd/63V

if that isn't a deal , I dunno what is ......

Dougie085 · 23rd April 2008, 10:08 PM

MFD isn't the same as uF is it?

Zen Mod · 23rd April 2008, 10:16 PM

Quote:

Originally posted by Dougie085
MFD isn't the same as uF is it?

yup ,it is - most the time ;

you can learn much just starring on pics ( and sometime lookin' what's written bellow )

Dougie085 · 23rd April 2008, 10:19 PM

Then I'd have to use....12 per board instead of 6. If I used the 15,000mfd

hmm thats a lot of caps.

Dennis Hui · 23rd April 2008, 10:38 PM

Dougie,

Maybe you should consider an unregulated PS. The
ZV5 needs one but the F5 doesn't. ("Ordinary
unregulated supplies will work fine....") This will
simplify things quite a bit.

The caps that Zen Mod mentioned are a good deal
and definitely worth considering.

Also, what transformers are you planning to use?

Dennis

Rodeodave · 23rd April 2008, 10:53 PM

As far as I remember it has not been mentioned in this thread that, besides the package and the power dissipation:

2SK370 is the same as a 2SK170
2SJ108 is the same as a 2SJ74

Experienced ones,

needless to say, already knew.

New it was to me.

Dougie085 · 23rd April 2008, 10:53 PM

Well I have a Aleph PSU board that I got from chipamp.com. But a regulated PSU would be nice and I don't think it will be that hard to build I just need to remember all the schematic symbols. I'll probably just use something like a 300VA 18VAC transformer. Avel or Plitron depending on how much I decide to spend.

Dougie085 · 23rd April 2008, 10:54 PM

Thanks Rodeodave, I was trying to find an alternative to the 2SJ108 as mouser didn't have it.

Variac · 23rd April 2008, 11:12 PM

Wouldn't this F4 power supply work well?
My impression is that Nelson uses pretty much the same supplies with the F series unless there is a reason not to..

And if it's good enough for Nelson..

http://www.firstwatt.com/downloads/f4_om.pdf

There is a power supply schematic towards the end; Page 15

Mark

Dennis Hui · 23rd April 2008, 11:41 PM

Quote:

Originally posted by Dougie085
Well I have a Aleph PSU board that I got from chipamp.com. But a regulated PSU would be nice and I don't think it will be that hard to build I just need to remember all the schematic symbols. I'll probably just use something like a 300VA 18VAC transformer. Avel or Plitron depending on how much I decide to spend.

Hi Dougie,

Just remember that if you do go with the ZV5 regulated supply
that you will need a transformer with a higher secondary
voltage.

Good luck.

Dennis

23rd April 2008, 10:53 PM	#296
Rodeodave diyAudio Member Join Date: Dec 2004 Location: in the alps Blog Entries: 1	As far as I remember it has not been mentioned in this thread that, besides the package and the power dissipation: 2SK370 is the same as a 2SK170 2SJ108 is the same as a 2SJ74 Experienced ones, needless to say, already knew. New it was to me. __________________ Gravity - Making the G since 13.7 billion B.C.

23rd April 2008, 11:12 PM	#299
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	Wouldn't this F4 power supply work well? My impression is that Nelson uses pretty much the same supplies with the F series unless there is a reason not to.. And if it's good enough for Nelson.. http://www.firstwatt.com/downloads/f4_om.pdf There is a power supply schematic towards the end; Page 15 Mark __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing!

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23rd April 2008, 10:08 PM	#292
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	MFD isn't the same as uF is it?

23rd April 2008, 10:19 PM	#294
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Then I'd have to use....12 per board instead of 6. If I used the 15,000mfd hmm thats a lot of caps.

23rd April 2008, 10:38 PM	#295
Dennis Hui diyAudio Member Join Date: Aug 2002 Location: Toronto, Canada	Dougie, Maybe you should consider an unregulated PS. The ZV5 needs one but the F5 doesn't. ("Ordinary unregulated supplies will work fine....") This will simplify things quite a bit. The caps that Zen Mod mentioned are a good deal and definitely worth considering. Also, what transformers are you planning to use? Dennis

23rd April 2008, 10:53 PM	#297
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Well I have a Aleph PSU board that I got from chipamp.com. But a regulated PSU would be nice and I don't think it will be that hard to build I just need to remember all the schematic symbols. I'll probably just use something like a 300VA 18VAC transformer. Avel or Plitron depending on how much I decide to spend.

23rd April 2008, 10:54 PM	#298
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	Thanks Rodeodave, I was trying to find an alternative to the 2SJ108 as mouser didn't have it.