Operational current source (CB8856E)

We found this circuit in a 70s EDN. The circuit makes use of operational of the time.

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Battery Combiner (CB4133E)
This circuit was found in an American telecommunications documentation from the 1980s. The circuit...
Electronic Cricket (CB795E)
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...
Cascading in 4013 (CB153E)
A binary counter until 2" or a divide-by-the same value can be built by cascading n 4013...