Clinical thermometer (CB7244E)

For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The sensor is a difficult component to obtain today.

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Non-Inverting Amplitude Limiter (CB14833E)
We found this limiter (clipper) in a French documentation from 1982. The circuit applies to any...
4-channel mixer (CB8756E)
Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be...
Comparator with Hysteresis MC34071 (CB15288E)
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...