F6 Amplifier - Page 2

noSmoking · 22nd July 2012, 08:00 PM

I like your grill !!!!! lol

[/QUOTE]

noSmoking · 22nd July 2012, 08:07 PM

Quote:

Originally Posted by buzzforb

oh man! I suck at transformers. Although i do have 4 on the way. What luck!

Papa ,you get the reaction you wanted,lol.
I wonder now some times PEOPLE shun

tranformers

and now ,,,look what popped up,lol A fetaformertransnomer,lol.

I'll listen to it ,,,,,,,
Cheers,

NS

Antoinel · 22nd July 2012, 08:19 PM

Quote:

Originally Posted by Nelson Pass

ZM has been nagging me for information on the F6. I have a very nice
sounding prototype, but the design and the article that accompanies it
have some details remaining.

However, I can afford to put out this teaser:

Mr. Pass: Is it correct to assume that the secondary windings of the transformer turn on the attendant FET in a synchronous fashion; meaning one is on more ON while the other is more OFF? Are the FETs SIT and/or enhancement? Is there a Patent Pending,? Brilliant topology including the novel loop feedback.

Nelson Pass · 22nd July 2012, 08:24 PM

The transformer secondaries are set up to drive the Fets in a matched
fashion, if that is what you're asking.

The Fets can be a wide variety of devices. In this case, R100's.

I no longer apply for patents.

I haven't seen this feedback mechanism as such, but you can be
sure it's been done one way or another, probably a long time ago.

Nelson Pass · 22nd July 2012, 08:27 PM

Quote:

Originally Posted by Uunderhill

Could a jFET be used as a phase splitter instead of the transformer ?

Go take a look at the JLH, or even simpler, the PLH amplifier.

Antoinel · 22nd July 2012, 08:40 PM

Mr. Pass. Thank you for replying. The secondary windings [phase circles] as shown confused me. When the upper winding has a rising positive signal, the upper FET turns on. Simultaneously the lower FET has a matching negative signal to turn it off. Is this an approach similar to OTL [output transformerless] from the past; with identical polarity semiconductors. Then, audiophiles grumbled about an output transformer[phase abberations]; so the interstage one was kept as a compromise [and also absent complemetary devices] because it is inherently higher fidelity. I may have past articles from Radio and Popular Electronics on OTL topology.

Woody1911a1 · 22nd July 2012, 08:58 PM

I no longer apply for patents.

Zen Mod · 22nd July 2012, 09:22 PM

moi don't wanna sch

moi wanna prototype porn

tiefbassuebertr · 09:33 PM

Quote:

Originally Posted by Nelson Pass

ZM has been nagging me for information on the F6. I have a very nice
sounding prototype, but the design and the article that accompanies it
have some details remaining.

However, I can afford to put out this teaser:

What disadvantages are to be expected by the use of a single ended input driver stages instead the here showed push-pull jFET version?

BTW - in this case this URLs are also of interest:
http://www.susan-parker.co.uk/zeus.htm
Zero Feedback Impedance Amplifiers
Push-Pull using only N-Channel MOSFETs
http://www.tubecad.com/2004/blog0006.htm

labjr · 22nd July 2012, 11:20 PM

I wonder if this is a low power design or will it get up and go?

22nd July 2012, 09:22 PM	#18
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	moi don't wanna sch moi wanna prototype porn __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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22nd July 2012, 08:00 PM	#11
noSmoking diyAudio Member Join Date: May 2010 Location: Texas	I like your grill !!!!! lol [/QUOTE]

22nd July 2012, 08:24 PM	#14
Nelson Pass The one and only Join Date: Mar 2001	The transformer secondaries are set up to drive the Fets in a matched fashion, if that is what you're asking. The Fets can be a wide variety of devices. In this case, R100's. I no longer apply for patents. I haven't seen this feedback mechanism as such, but you can be sure it's been done one way or another, probably a long time ago.

22nd July 2012, 08:40 PM	#16
Antoinel diyAudio Member Join Date: Jan 2012 Location: Pennsylvania Blog Entries: 1	Mr. Pass. Thank you for replying. The secondary windings [phase circles] as shown confused me. When the upper winding has a rising positive signal, the upper FET turns on. Simultaneously the lower FET has a matching negative signal to turn it off. Is this an approach similar to OTL [output transformerless] from the past; with identical polarity semiconductors. Then, audiophiles grumbled about an output transformer[phase abberations]; so the interstage one was kept as a compromise [and also absent complemetary devices] because it is inherently higher fidelity. I may have past articles from Radio and Popular Electronics on OTL topology.

22nd July 2012, 08:58 PM	#17
Woody1911a1 diyAudio Member Join Date: Nov 2010 Location: Marblehead Ma	I no longer apply for patents.

22nd July 2012, 11:20 PM	#20
labjr diyAudio Member Join Date: Apr 2003 Location: MA	I wonder if this is a low power design or will it get up and go?