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Mystery amplifier ... no clue?
Mystery amplifier ... no clue?
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Old 1st September 2008, 03:07 PM   #1
lineup is offline lineup  Sweden
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Question Mystery amplifier ... no clue?

found this circuit
in some audio collection zip stuff i downloaded yesterday

anybody knows this mystery amplifier?

to me it looks not as a complete figure
but probably could be made to work
it looks more like some operational amplifier topology, to me

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Old 1st September 2008, 03:50 PM   #2
DRC is offline DRC  United Kingdom
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Folded cascode ?
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Old 1st September 2008, 04:06 PM   #3
peranders is offline peranders  Sweden
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Mystery amplifier ... no clue?

Yes, Uppställning, a fragment of something but a folded cascode.
/Per-Anders (my first name) or P-A as my friends call me
Group buy: DCT03 DC trap for big toroidal transformers. Sign up for interest HERE. 18 pcb's in interest.
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Old 1st September 2008, 04:35 PM   #4
roender is offline roender  Romania
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CCS loaded folded cascode ... without current mirror (missing part)
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Old 6th September 2008, 10:45 AM   #5
lineup is offline lineup  Sweden
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I guess you are right .. it looks very familiar to me
... from somewhere
still i am not at all sure what is really this

cant help wondering
who came up with this half finished circuit
without any comments, values or anything
maybe his wife gave him some order to wash some laundry
or go to buy some food for their evening supper
and so he had no choice but to leave it this way ... and then forgot about it

Is it it possible to make something nice & good out of such a setup?

How would you go on and use this input stage?
.... and for what type of amplifier - pre or power?
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