A very interesting SW transmitter circuit or shortwave transmitter circuit which is very easy to build and you dont have to make any SW or AM coil for it. The circuit is using 12 MHz crystal, due to which the circuit will not drift its frequency and will broadcast on exect 12MHz.
The circuit is using 4 Ohms 2 watt loud speaker as microphone which will convert the voice in to electrical signal and then this audio signal amplified by 2N2904A transistor, after amplification this audio signal modulates the carrier frequency obtained from 2N3053 transistor and generated through its collector and transmitted in to space through antenna. The range of this transmitter is 25 to 30 meters but can be further extended by increasing the antenna wire lenght with proper matching.

This circuit is for educational purpose only. 

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