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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Electronic voltmeter (CB23755E)
This circuit was found in Radio Electronics magazine from August 1966. The transistors are from...
Shortwave calibrator (CB23638E)
This circuit generates signals at fixed frequencies for calibrating shortwave receivers. We found...
1.5 V White LED Flasher (CB20428E)
This circuit switched with the help of small inductors produces a peak voltage above 20 V that is...