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.

Signal injector (CB21554E)
The CK722 transistor used in this circuit is one of the first commercial types in the world. The...
Automatic Dimmer (CB18864E)
This automatic dimmer for incandescent lamps was found in a European publication from the 1980s. The...
Voltage doubler with 555 (CB1230E)
This traditional doubler configuration with the 555 can be found in other articles on the author’s site....