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.
This configuration was found in a 1978 technical documentation. What the circuit does is convert an...
Found in American documentation from the 1980s, this circuit can be designed with equivalent...
This circuit was found in an American 80s circuit manual. The components used are unusual. The...