Binary Counter using lamps (CB6606E)

This is a transistor flip-flop suggested by General Electric in a 1966 paper. The transistors are of the time and can be used equivalents.

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Constant current regulator (CB8902E)
This circuit for currents from 500 mA to 1.5 A was found on a Ham Radio from the 90s. R4...
Isolation Transformer (CB25795E)
With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995...
High CMRR Instrumentation Amplifier (CB4930E)
Found in a 1980s documentation, this amplifier features high common mode rejection. The operating...