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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Adjustable Constant Current Source (CB6621E)
This constant current source for high voltage loads was obtained from a 1967 General Electric...
Balanced Modulator with Transistors (CB4237E)
Found in a 1980s telecommunications documentation, this balanced modulator circuit uses...
Active Band Pass Filter (CB6247E)
This circuit was found in Texas Instruments documentation from the 1980s. The circuit has a Q less...