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.

Windshield wiper timer (CB19511E)
This circuit is from an old publication, from the 80s, since in modern cars this type of circuit is...
Neon lamp driver with the 555 IC (CB8133E)
Found in an American documentation from the 90's, this circuit aims to light a neon lamp with...
Developing Table For Silk Screen (CB4445E)
This is an old 1988 circuit consisting of a timer or time control for exposing silk-screen arrays. The...