Double limit detector (CB9589E)

Found in ancient American documentation, this circuit uses some components from the time, such as comparators.

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Audio Alarm (CB6422E)
Found on 90's Popular Electronics, this circuit triggers when the microphone picks up a sound. The...
Debounced Isolator (CB1473E)
We found this circuit in a 1972 documentation. However, it can be assembled with more modern...
One Hour Timer using the 555 (CB1271E)
We found this configuration in documentation from the 1970s, but all components are current. If a...