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.
Found in American documentation from the 1970s, this circuit is intended for amplifying analog TV...
This circuit uses only passive components and the instrument can be a microammeter or the lowest...
This oscillator generates quadrature signals, that is, with a 90-degree lag. The frequency is...