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 old amplifying stage was found in radios and small amplifiers of the time. The circuit is...
This crystal-controlled oscillator can generate signals as high as 200 MHz. The L1 coil is made up...
The circuit shown in the figure is triggered by an input voltage determined by the setting of P1....