This powerful transmitter for the 27 MHz band was found in a Japanese publication from 1961. The circuit is powered by battery and has the details of the coils given next to the diagram.
When you speak into the microphone of this circuit, the sound produced in the speaker resembles a robot...
This simple circuit uses few common components and can be installed in any car. In case of...
This circuit was found in old documentation, but the transistor may be the modern equivalent BC547....