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Old 12th October 2017, 03:07 PM   #11
catd is offline catd  Europe
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Thanks for the advices.
First, I would test some single different OPs until I decide which type I choose for all.
The power consumption will not be a problem. The power supply is a 30VA transformer and standard +/- 15V voltage regulator (7815/7915). I could change the power supply in case of emergency, it is a separate component.
As far as I know, some (FET-) OP-types do not like, if (neg.-) input and output are connected directly. I would have to consider this in the selection, because preferably I want to make no further changes to the circuit or the PCB. But TL072 does not seem to belong to those.
Perhaps first not an adapter board, but a diy-adapter-socket would be better. Bottom side to fit in the 747-sockets at the equalizer board, top with DIL-8 socket to test various up-to-date ICs.

Last edited by catd; 12th October 2017 at 03:18 PM. Reason: orthography
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Old 12th October 2017, 05:26 PM   #12
Mooly is offline Mooly  United Kingdom
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The circuit diagram you posted is all classic 'text book' circuitry. The TL072 should be an ideal swap I would have thought.

Jfet opamps have a peculiar 'problem' of phase inversion if the common mode input voltage range is exceeded... that will never happen with your circuit.
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Old 12th October 2017, 06:33 PM   #13
catd is offline catd  Europe
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"all classic "textbook"circuits" That I had also thought.
When I buy parts the next time, I will order some of the suggested IC types and test them.
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