This oscillator produces a modulated signal using a unijunction transistor. We found it in an American documentation from 1965. The circuit modulates in frequency the generated signal.
This circuit is designed to activate an automotive alarm after 8 minutes of activation. Of course...
This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit...
This astable multivibrator, well known to all, was found in the Raytheon transistor application manual of...