Steam locomotive (T315E)

This 1967 modeling circuit mimics the whistle of a locomotive. The steam-shrieking wheezing is set in a 2k2 potentiometer.

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Contactless car ignition (CB6393E)
This circuit was obtained from 1967 documentation. It uses a sensor to determine the trigger...
Light controller (CB7049E)
Found in an old Popular Electronics this circuit can also be adapted to be used as a shield. In...
TTL Counter Modulus (CB895E)
This one-digit TTL modulus for 7-segment display can be parto f digital projects. Many of them can be...