Address decoder using the 74LS138 (CB20537E)

This decoder circuit 3 of 8 was found in a publication for PCs from 1992. The circuits are TTL and must be powered with 5 V.

Voice activated switch (CB8434E)
This sound or voice relay was found in a Popular Electronics. It includes an amplification stage and can be...
Shielded cable driver (CB20917E)
This circuit was found in National documentation from the 1980s. The circuit is intended for...
Courtesy Light Expander (CB4958E)
This circuit keeps the courtesy lights of a car on for a while after the doors are closed. The...