PC address decoder (CB20536E)

This TTL decoder circuit for PC ports was found in a document from 1992. The power supply can be PC's own circuit.

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...