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Old 14th March 2012, 08:05 PM   #1
Stee is offline Stee  Italy
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Default an inverting amplifier

Jean Hiraga's Super Class-A Amplifier
This design was modified from the original's Hiagra
to obtain an inverting input
and eliminate the internal function of the differential feedback
that works much better with the external resistive divider
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Last edited by Stee; 14th March 2012 at 08:09 PM.
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Old 14th March 2012, 08:37 PM   #2
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An inverting amplifier such yours can be done with any kind of amplifier: a simple TDA2006 can be used. The class A output is a good refinement, I remember old auto radios with a germanium AD149 transformer loaded.
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Old 14th March 2012, 09:11 PM   #3
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The input impedance of 680 ohms is not something I'd expect to be driven easily with any kind of preamp. Increasing resistor values would increase noise, too.

Guess why high-gain inverting amps aren't too popular.

You may find them as inverting buffer stages (gain -1) though.
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Old 14th March 2012, 10:56 PM   #4
MiiB is offline MiiB  Denmark
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Ohh that shorr integral current feedback of the hiraga is the best part of it...why would you take that out,,,??
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Old 15th March 2012, 12:52 PM   #5
Stee is offline Stee  Italy
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because pull up the emitter to make the NFB difference generates emphasis
the difference must be made by two resistors
680 ohm input impedance are great for any CD player
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Old 15th March 2012, 02:56 PM   #6
knutn is offline knutn  Norway
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Have you tried this amplifier? You have positive feedback (it's an oscillator) and the output devices will run at any current they would like...
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Old 15th March 2012, 03:20 PM   #7
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Quote:
Originally Posted by knutn View Post
Have you tried this amplifier? You have positive feedback (it's an oscillator) and the output devices will run at any current they would like...
You are right. I didnīt see that There are 2 voltage inverters (CE) and 2 followers (CC). This is a zero net inverting phase, so it is positive feedback.
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Old 15th March 2012, 03:35 PM   #8
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Quote:
Originally Posted by sgrossklass View Post
The input impedance of 680 ohms is not something I'd expect to be driven easily with any kind of preamp.
I would say any few kind of preamp like such equipped with tubes and several vintage models from the 60s (e. g. first solid state generation).
Considering the advantages and disadvantages of a lower input resistance by power amps for new projects (approximately between 500 ohms and 5000 ohms), clearly outweigh the benefits.
Modern audio devices with high output impedance are very rarely on the marked.
Additional a refitting of an impedance matching section isn't a great issue.

Quote:
Originally Posted by Stee View Post
Jean Hiraga's Super Class-A Amplifier
This design was modified from the original's Hiagra
to obtain an inverting input
and eliminate the internal function of the differential feedback
that works much better with the external resistive divider
Check also out the schema from post #4 about
Has anybody Burmester or AVM schematics?
Same basic consideration regarded the input stage

Last edited by tiefbassuebertr; 15th March 2012 at 03:41 PM.
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Old 17th March 2012, 08:56 PM   #9
Stee is offline Stee  Italy
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Osvaldo are right
isn't inverting
M9 is again the best
http://www.diygene.com/schemas/m-9sch.pdf
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