3-IC AD converter (CB9028E)

Found in American documentation from the 70s, this circuit uses components of the time, uncommon today.

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Constant Current Source (CB6625E)
This two-transistor constant current source is from a 1968 documentation. Modern equivalent...
DC to AC converter (CB9668E)
This converter or inverter uses components that are still common. The transformer is the type...
Temperature sensor with frequency output (CB25386E)
Using a V/F converter this circuit was found in the June 1991 issue of Radio Electronics magazine. The...