Ebay 15W class-a zero feedback modules?

sharpi31 · 24th July 2009, 07:00 AM

Please can anyone who understands zero-feedback class-a amplifiers comment on the schematic shown here?

Ebay 15W zero-feedback class-a modules

Is this accurately described, on another ebay con...?

poynton · 24th July 2009, 07:45 AM

This Ebay seller is a well-known scam artist who takes your money and does not send the goods !!!!

Andy

sharpi31 · 24th July 2009, 08:02 AM

Thanks for the warning. Bit confused though as he has 2045 transactions and 100% positive feedback (well greater than 99.5% as he has a few negatives but less than 0.5%...)

tiefbassuebertr · 24th July 2009, 08:36 AM

This circuit is a classical push pull power follower (source follower, unity gain, but not "zero feedback" design - only "zero negative feedback" design !!) without voltage gain stages.
To get more informations about the circuit please read the article "cool follower" from Andrea Ciuffoli - Home Page
http://www.audiodesignguide.com/my/index.html
I would prefer the "Power Follower 99" from the same author, also to find on this website and about
Power Follower 99 sound impressions?

Please note, that there are no heatsink and no transformer regarded Item number: 120450912260. In additional there are no computer grade main electrolytic capacitors with screw terminals. That is the main reason for the ultra low cost for one pair of this auction

sharpi31 · 24th July 2009, 11:24 AM

Without voltage gain, a high gain preamp like BOZ would be required?

Would a CRC power supply be required?

24th July 2009, 07:00 AM	#1
sharpi31 diyAudio Member Join Date: Oct 2005	Ebay 15W class-a zero feedback modules? Please can anyone who understands zero-feedback class-a amplifiers comment on the schematic shown here? Ebay 15W zero-feedback class-a modules Is this accurately described, on another ebay con...?

24th July 2009, 07:45 AM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Beware ... !!!! This Ebay seller is a well-known scam artist who takes your money and does not send the goods !!!! Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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24th July 2009, 08:02 AM	#3
sharpi31 diyAudio Member Join Date: Oct 2005	Thanks for the warning. Bit confused though as he has 2045 transactions and 100% positive feedback (well greater than 99.5% as he has a few negatives but less than 0.5%...)

24th July 2009, 08:36 AM	#4
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	This circuit is a classical push pull power follower (source follower, unity gain, but not "zero feedback" design - only "zero negative feedback" design !!) without voltage gain stages. To get more informations about the circuit please read the article "cool follower" from Andrea Ciuffoli - Home Page http://www.audiodesignguide.com/my/index.html I would prefer the "Power Follower 99" from the same author, also to find on this website and about Power Follower 99 sound impressions? Please note, that there are no heatsink and no transformer regarded Item number: 120450912260. In additional there are no computer grade main electrolytic capacitors with screw terminals. That is the main reason for the ultra low cost for one pair of this auction

24th July 2009, 11:24 AM	#5
sharpi31 diyAudio Member Join Date: Oct 2005	Without voltage gain, a high gain preamp like BOZ would be required? Would a CRC power supply be required?

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