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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Miller Oscillator (CB9649E)
This crystal-controlled 1000 kHz oscillator was found in 1980s American documentation. The...
741 amplifier for phototransistor (CB25522E)
In the figure we have an amplifier using the 741 operational amplifier without the need for a...
Simple Brake Light (CB10668E)
This circuit came out in a publication called Electronics Handbook of 1993. The circuit shows how...