Voltage probe (CB8184E)

Found in a 90s Popular Electronics, this circuit uses general-purpose transistors, serving to indicate the polarity of circuits.

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Extended range power control (CB7935E)
This circuit was found in a General Electric documentation from 1965. The circuit is full wave for...
Fast adder 2 (CB7056E)
This is another quick adder that we found in an Electronic Design from the 80s. It also applies to...
Crossing Signal For Railroad Modeling 2 (CB3855E)
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...