Precision temperature transducer (CB10174E)

This circuit was found in 1980s documentation. The circuit uses components from that time serving for remote sensors.

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Audible pulse analyzer (CB7139E)
Found in an English documentation from the 90's, this circuit makes slow logical pulses audible,...
Acid rain monitor (CB7992E)
This circuit indicates when a rain is acidic by monitoring its pH. The circuit is from a 90s RE...
Sub Carrier Generator (CB4241E)
The basic purpose of this circuit is to apply an audio signal to a video carrier for sound and...