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Old 26th August 2011, 10:14 AM   #21
Stee is offline Stee  Italy
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Default Diamond input buffer

I would like to extend this inverting design
to an optimized one
because PRESENCE effect of this shunt configuration
really striking new features
http://www.diygene.com/schemas/a-700sch.pdf
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Old 27th August 2011, 08:31 PM   #22
Stee is offline Stee  Italy
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Default Diamond input buffer 2

see schematic
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Old 28th August 2011, 04:23 PM   #23
Stee is offline Stee  Italy
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Default another common base amplifier

inverting amplifier class A
put R7 to GND
delete C1 and R3
R12 and R13 0,22 ohm
Battery PSU 12 + 12V
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Old 28th August 2011, 04:42 PM   #24
Bigun is online now Bigun  Canada
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what about simple version ?

> I like it. It has overtones of the Lazy Cat SSA in there too.

Or course you'll need to flesh out some details. The PSRR looks to be very risky with the simple version - unless you are using regulated supplies for the front end at least.

I have a pair of transformers somewhere, problem is they don't allow any real current as they're for small signals only. How can you modify your concept to keep dc out of the transformer.
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Last edited by Bigun; 28th August 2011 at 04:45 PM.
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Old 28th August 2011, 09:14 PM   #25
Stee is offline Stee  Italy
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Default TRY WITH SUPPLY TRANSFORMER BIGUN!

230V for primary
24+24v for secondary or more
transformer is mandatory with balanced signal

see this variation with unfloating input stage
and common base VAS
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