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Old 2nd October 2008, 07:21 PM   #1
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Default WOZ: Wife Of Zen concept (Courtesy to NP)

Here is one more concept, Wife Of Zen.

Balanced, FET inputs, transformer output.
Local NFB by current in each shoulder, common NFB by voltage, also a common PFB by current to reduce an output impedance. Inverting amp, both NFB and input goes to the same point.

Is not she beautiful?

Enjoy!
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Old 2nd October 2008, 08:17 PM   #2
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Oops... Error corrected.

Now she looks right!
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Old 3rd October 2008, 03:37 PM   #3
Mooly is offline Mooly  United Kingdom
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Re post #1

A self oscillating "Wozallator" with reactance coil
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Old 3rd October 2008, 03:49 PM   #4
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Quote:
Originally posted by Mooly
Re post #1

A self oscillating "Wozallator" with reactance coil
Why?

The error was, a negative FB by current instead of a positive one. What pictured in #2 may be prone to oscillations on a frequency dependent on the speaker connected. Actually, one pot will be needed to fine tune positive feedback so output resistance will be enough negative to equalize the driver, but not enough to make it oscillating.


In a parallel thread a gentleman criticizes NP's amp for high output resistance, this lady may have any output resistance the owner desires. She is very flexible!
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Old 3rd October 2008, 03:55 PM   #5
Mooly is offline Mooly  United Kingdom
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Why Why It sounded rather good I thought
It reminded me of old valve radios with a reactance coil -- the way it was drawn.

Very flexible indeed
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Old 3rd October 2008, 09:28 PM   #6
Luke is offline Luke  New Zealand
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Looks more like a mistress than a wife
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Old 3rd October 2008, 09:36 PM   #7
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Wavebourn,

Please explain how this circuit works. Show some component values.

Rick
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Old 3rd October 2008, 11:17 PM   #8
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Quote:
Originally posted by Luke
Looks more like a mistress than a wife
MOZ?

Quote:
Originally posted by sawreyrw
Wavebourn,

Please explain how this circuit works. Show some component values.

Probably I'll even build one for a Smocking Amp to show how it works...
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Old 20th October 2008, 10:01 PM   #9
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Unfortunately I had no time to build one... The next year I will definitely bring a stereo set, to drive a stereo speaker I am going to build based on an article I've found in some 1920'th magazine!
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Old 17th April 2009, 02:12 PM   #10
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Anatoly,

Just curious about your view on this, almost all the "feedback around an output transformer" methods I have seen fail because the feedback tries to correct what can never be corrected, which is the limitations inherent in a transformer. So, the result is an output that is on the surface "flat" in frequency but lacking otherwise.

What do you think?

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