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What is Gain Structure?
What is Gain Structure?
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Old 2nd April 2016, 01:25 PM   #111
bobdoh is offline bobdoh  United States
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Join Date: Apr 2016
Location: Frisco, TX
Hi Guys!

Many thanks for the help!

Andrea Ciuffoli (thanks)

I went to his site and found his paper on his
"Power Follower 99" a solid state class A amp 30wps at 6ohms

He also says

"The presented topology, has NO gain (actually it looses something) and should be preceded by voltage gain stage, with an output swing not lower than 10Vrms and Rout < 1000Ohm. "

This sounds perfect! Can this zero gain amp be implemented DIY or is it too esoteric and should be purchased from a person like Ciuffoli?
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Old 2nd April 2016, 01:51 PM   #112
AndrewT is offline AndrewT  Scotland
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Ciuffoli Power Follower(Buffer) has very few parts and could be done as hardwired.

A gain of 1times is equal to +0dB = -0dB
A gain of 0.99times is equal to -0.09dB

If you preceded the Power Follower with a very low gain pre-amp stage like switchable between +0dB, +6dB and +12dB, you could probably drive the output to maximum power with most of your sources.
Possibly BA 3 pre, or Juma, or many others.
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Old 2nd April 2016, 04:19 PM   #113
bobdoh is offline bobdoh  United States
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Location: Frisco, TX
Hi Andrew

Many thanks for your help. I understand conceptually what I need - I just lack any technical ability to build. Are there people that will build these custom for a fee?

If you had a generous budget which of the pre-amps you listed would you recommend (given a zero gain amp)? (should it be dual mono?)

On the zero gain DIY amp - is there a Honey Badger equivalent of a zero gain design out there that can be used?

Thanks again
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Old 2nd April 2016, 06:15 PM   #114
AndrewT is offline AndrewT  Scotland
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If I didn't need pre-amp gain then either a B1 or a DC B1.
If a bit of gain is required, then probably a Juma.
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Old 22nd March 2018, 02:08 AM   #115
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by Telstar View Post
Now the issue is where to attenuate. Doing it at the power amp imput is NOT the ideal solution, the best option would be to adjust the gain of the amp itself (like Ayre and ASR do).
The ideal gain structure would be
2-2,5V from digital source -> input buffer -> adjustable VAS from like 0,1x to 20x (to provide for less efficient speakers) -> unity current gain.
And after 6 years nobody made a DIY circuit that realizes this...
Addenda: if we do NOT employ GNFB, stability shouldn't be an issue.
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Old 10th August 2018, 04:01 PM   #116
senthilsanthosh is offline senthilsanthosh
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Join Date: Aug 2018
Default i have a question

Dear Bro, I used tda 7294 ic shan board for channels. What is the appropriate input volt used for best result in this board? How many ampere is should be use for best result? pls reply. Is it convenient volt transformer 24 0 24 10amp, 28 0 28 8amp, 30 0 30 8amp? pls plss reply. I wait for your response. plss comment
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Old 21st August 2018, 06:13 PM   #117
greygreg is offline greygreg
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Interesting post, I still need to re-read some terms and google about it.
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