Cable Locator (CB21303E)

This audio detector circuit can be used for cable identification. We found it in a Popular Electronics from the 90s.

One push button on off switch (CB7199E)
This circuit turns a lamp on and off with alternate touches of a switch. Modern Darlingtons can be used....
Photo relay (CB21912E)
This circuit with the CK722 was found in a Raytheon publication from the 60's. The relay is of the...
Three-phase power supply (CB23680E)
This circuit was found in Radio Electronics magazine from July 1960. The components used are...