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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Voltage Doubler (CB17076E)
This simple voltage doubler provides a continuous voltage at its output that is twice the peak...
High Pass Filter (CB25602E)
This simple 741 circuit was found in the August 1993 Electronics Now magazine. The source must be...
Intermittent Alarm (CB26233E)
This circuit emits a sound at regular intervals to prevent you from falling asleep, for example. It...