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 is a Japanese commercial circuit found in a 1967 documentation. The transistors are from the...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This control of DC motors for currents up to about 200 mA was obtained in an American publication of...