This circuit from the 90s, found in an Electronic Engineering can be used as a shield since its control is digital with TTL logic of 5 V. The components used are still common today.
This is a typical point scale or moving bar circuit with the LM3915. We found it in old American...
This circuit simulates the actual departure of a train as the speed increases slowly. The power...
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...