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.
A binary counter until 2" or a divide-by-the same value can be built by cascading n 4013...
This small FM transmitter has a sensitive modulating stage and is therefore suitable for listening...
The connection of high-value input resistors causes the circuit to behave like a conventional...