Passive tunable filter (CB7407E)

Found in American documentation from the 1980s, this circuit is a basic signal rejection filter network using only passive components.

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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...