This circuit is from a 1980's documentation for telecommunications. The circuit is used in SSB and the diodes must be suitable types for the application. The audio input is low impedance.
This circuit can generate signals from 2 to 15 MHz or 4 to 22 MHz depending on the used components...
The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and...
In the figure we show an application in which the 4093 excites a stage with 4 transistors in the...