The integrated circuit used in this' 90s amplifier is not very common today. The supply is 24 V, the gain is 50dB and the input resistance is 100 k. The circuit is from an old circuit manual.
We found this circuit in a French documentation from the 80's. The components used are still...
This circuit, which may have appeared elsewhere on this site, is from the integrated...
Two operational amplifiers are used in this source obtained in an American documentation...