Balanced Line Driver (CB6223E)

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

Tunnel diode simple noise generator (CB23705E)
This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a...
Bidirectional Power Voltage Follower (CB16231E)
In the figure we have an application in which the input and output voltage are equal, with the...
Telephone Line Tester (CB21266E)
We found this circuit in a Radio Electronics from the 90s. The circuit is for conventional analog...