This very low current circuit was found in the April 1995 Electronics Now magazine. The frequency should be chosen for maximum efficiency according to the small transformer used.
This circuit was found in a 1991 publication. The transistor can be a general-purpose type....
This circuit was found in the magazine of radio amateurs 73 in a 90's edition. The components are...
Found in an old American documentation this FM modulator makes use of a varactor diode. The...