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Old 22nd July 2012, 08:00 PM   #11
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I like your grill !!!!! lol

Click the image to open in full size.[/QUOTE]
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Old 22nd July 2012, 08:07 PM   #12
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Default gee transformer,,,,

Quote:
Originally Posted by buzzforb View Post
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
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Old 22nd July 2012, 08:19 PM   #13
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Quote:
Originally Posted by Nelson Pass View Post
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.
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Old 22nd July 2012, 08:24 PM   #14
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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.

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Old 22nd July 2012, 08:27 PM   #15
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Quote:
Originally Posted by Uunderhill View Post
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.

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Old 22nd July 2012, 08:40 PM   #16
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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.
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Old 22nd July 2012, 08:58 PM   #17
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I no longer apply for patents.
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Old 22nd July 2012, 09:22 PM   #18
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Old 22nd July 2012, 09:30 PM   #19
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Quote:
Originally Posted by Nelson Pass View Post
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

Last edited by tiefbassuebertr; 22nd July 2012 at 09:33 PM.
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Old 22nd July 2012, 11:20 PM   #20
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I wonder if this is a low power design or will it get up and go?
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