This circuit was obtained from a 1968 documentation and can be adapted to use current equivalent components. The maximum frequency depends on the components used.
The transistors in this circuit can be the BC548 and a small speaker serves as a microphone. The...
This circuit generates signals whose frequency depends on C1 and C2. JFETs are common types like...
We found this small FM transmitter in a 1980 publication. What sets it apart from traditional...