This circuit uses a CMOS integrated circuit as a basic element and can be combined with the previous circuits. The circuit is from a Radio Electronics from May 1990.
This circuit of a 1969 Electronic Design uses RTL logic. The setting can be adapted to TTL. The...
This circuit can be found in other projects in this site. When S1 is open the circuit produces...
This interface shield circuit is from the 1983 Intersil Databook. The components used are uncommon...