Full wave rectifier filter (CB7582E)

This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical and the operational amplifiers can be 741.

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Wavemeter (CB15830E)
We found this circuit in an old documentation from the 70s. The text is the original one of the...
Thermocouple Amplifier (CB17615E)
The circuit shown in figure is suggested by Maxim in an application note. The operational...
10 W-Transistor Amplifier II (CB998E)
We found this amplifier in a 1990 documentation. The transistors are common, having been made...