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.

Ramp Generator and Integrator (CB24625E)
This circuit was found in the March 1980 issue of Radio Electronics magazine. It is based on the...
Bilateral Converter EIA232 / 485 With Optical Isolation (CB17681E)
This circuit (2009) has driver control through the RTS signal or in automatic mode through the...
Alarm Siren 4001 (CB24391B)
This monotone alarm oscillator circuit was found in July 1975 Radio Electronics magazine. Power is...