Ebay 15W class-a zero feedback modules? - diyAudio
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Old 24th July 2009, 07:00 AM   #1
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Default 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...?
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Old 24th July 2009, 07:45 AM   #2
poynton is offline poynton  United Kingdom
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Default Beware ... !!!!

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

If it ain't broke, break it !! Then fix it again. It's called DIY !
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Old 24th July 2009, 08:02 AM   #3
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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%...)
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Old 24th July 2009, 08:36 AM   #4
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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
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
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Old 24th July 2009, 11:24 AM   #5
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Without voltage gain, a high gain preamp like BOZ would be required?

Would a CRC power supply be required?
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