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Old 25th November 2009, 02:35 PM   #91
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Tim,
You started off with a classic Diamond topology, which has one very strong point: zero NFB.

You now have added a CFP output stage, whichhas a huge amount of NFB, and will sound very different.

I believe you need to get soldering and LISTENING, simulations tell you zip about the real world.

Regards, Allen
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Old 25th November 2009, 06:56 PM   #92
jcx is offline jcx  United States
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well actually any ef stage has "100%" feedback and ef input and output impedances are calculated with Blackman's formula - exactly as any other negative feedback amplifier
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Old 6th May 2011, 03:57 PM   #93
lineup is offline lineup  Sweden
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Diamond with Sziklai CFB output
shows low distortion as long as the bias is in Class A.
There is however possible to finetune
and get rather low distortion in Class AB.

Below a diamond sziklai follower for Headphone Amplifier
in Class A with only 0.004% THD
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File Type: png diamond_sziklai_2a.png (14.3 KB, 473 views)
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Old 6th May 2011, 09:16 PM   #94
TimS is offline TimS  New Zealand
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Very nice circuit, I particularly like how the input transistors are sort of cross cascoded with the output transistors.
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Old 7th May 2011, 02:13 AM   #95
AKSA is offline AKSA  Australia
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This is a buffer, Tim, unity voltage gain, NOT an amp, so you will need an additional stage or two out front. A tube would do nicely......

Hugh
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Old 7th May 2011, 04:02 AM   #96
sregor is offline sregor  United States
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Quote:
Originally Posted by lineup View Post
Diamond with Sziklai CFB output
shows low distortion as long as the bias is in Class A.
There is however possible to finetune
and get rather low distortion in Class AB.

Below a diamond sziklai follower for Headphone Amplifier
in Class A with only 0.004% THD
How does this work? I see zero volts C-E on the input transistors? Just wondering ... (Still a nifty circuit)
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Old 7th May 2011, 07:08 AM   #97
TimS is offline TimS  New Zealand
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Quote:
Originally Posted by AKSA View Post
This is a buffer, Tim, unity voltage gain, NOT an amp, so you will need an additional stage or two out front. A tube would do nicely......

Hugh
There is still current gain and the output power is greater than the input power so I would of the superset amplifier but it is also of the sub set buffer.
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Old 14th May 2011, 11:37 PM   #98
sregor is offline sregor  United States
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Quote:
Originally Posted by sregor View Post
How does this work? I see zero volts C-E on the input transistors?
RE lineups's szilaki buffer - I'm mistaken - there is voltage across the input transistors. I get it now.
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Old 15th February 2012, 10:45 PM   #99
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So, which circuits got built? How did they perform?
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