Notes.
■You can assemble the circuit on a general purpose PCB.
■The circuit can be powered from a9V PP3 battery.
■The Antenna A1 can be a 1M long wire.
■The inductor L1 can be made by making 6 turns of 0.8mm enameled copper wire on a 5.5mm diameter/4.5mm length plastic former.
■With a matching antenna and proper tuning this transmitter can have range upto 100meters.