This detector with ultra-low deviation was found in an American documentation from the 90s. Operational amplifiers are from that time. The power supply must be symmetrical.
This configuration found in other companies' manuals is from Motorola's 1993 Linear Interface ICs....
This amplifier for biological research was found in an Electronic Design from 1964. The...
The operational amplifier used is not common today, but the circuit can be implemented with modern...