Balanced Line Driver (CB6223E)

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

Simple Residential Alarm (CB18117E)
When the sensor connected to points A and B is activated, removing the ground from the base of Q1...
Wien Bridge Oscillator (CB14110E)
This oscillator was found in the 1994 National Instruments Linear Applications Handbook. The...
Crystal Variable Oscillator (CB13851E)
With the circuit shown in the figure, the frequency of a 5 MHz oscillator controlled by crystal can...