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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Infrared Transmitter (CB20337E)
This infrared emitter (pulsating) can be used with several other alarm and remote-control circuits on...
UJT Triangular Signal Generator (CB19509E)
Signals of up to a few tens of kilohertz can be generated by this circuit found in a European...
Broadband Amplifier (CB20057E)
This amplifier was found in a technical documentation from the 1970s. The circuit uses 2N2218...