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 small medium wave radio was manufactured in the 1960s in Japan. The circuit is powered by 4...
This transistorized receiver was found in Popular Electronics from February 1968. Transistors are...
We found this circuit in the Linear Applications Handbook by National Semiconductor. The circuit can...