This two-digit digital pressure gauge was found in the 1992 special edition of Radio Electronics Experimenter. A/D converter integrated circuits are uncommon today.
The operating system used in this circuit of the 1994 Linear Applications Handbook by National...
This TTL circuit was found in an American documentation from the 80s. The components are common in the...
This circuit is from a 1998 Poptronics. The circuit triggers a buzzer after a certain time, waking...