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2nd October 2008, 07:21 PM
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#1 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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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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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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2nd October 2008, 08:17 PM
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#2 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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Oops... Error corrected.
Now she looks right!
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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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3rd October 2008, 03:49 PM
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#4 | |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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Quote:
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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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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3rd October 2008, 11:17 PM
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#8 | ||
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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Quote:
Quote:
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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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20th October 2008, 10:01 PM
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#9 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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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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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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17th April 2009, 02:12 PM
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#10 |
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diyAudio Member
Join Date: Apr 2002
Location: New York State USA
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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? _-_-bear
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_-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. -- |
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