This circuit was found in a documentation for radio amateurs from the year 70. Its purpose is to produce a tone on a transducer when transmitting messages in SSB telegraphy.
This circuit automatically controls the degree of illumination. As the circuit is from 2001, it...
This interesting effect circuit was found in a 1982 publication. The sequence of musical notes is...
This PUT circuit was found in a 1967 General Electric SCR manual. The basic component is unusual, and...