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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Antenna Tuner (CB21637E)
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Light detector (CB8338E)
This highly sensitive light sensor was found in a 1970 General Electric documentation. The circuit...
Wireless Headset Transmitter (CB20970E)
This circuit was found in a Popular Electronics from the 90's. The CMOS integrated circuit used is...