Balanced Line Driver (CB6223E)

This 600-ohm line driver was found in a 1980s documentation. The integrated circuit used is not common today.

Optical zero-crossing switch (CB7416E)
This normally open, two-terminal, high-sensitivity circuit was found in General Electric's...
Bubba Oscillator (CB12743E)
Bubba's oscillator, shown in the figure, is another type of phase shift oscillator, but it takes...
MOSFET Electroscope 3N128 (CB852E)
This sensitive electroscope uses a MOSFET 3N128 and can detect electrostatic charges of objects....