An FM Transmitter is an electronic device that can air audio signals from a source on a selected range of frequencies. They are generally used to broadcast stationary audio from devices such as TV & computers, around a room. They are inexpensive & simple to design. So, in today's article, we will look into a step-by-step tutorial on how to make a High Range FM Transmitter circuit using some NPN transistors & a small no. of other components.
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The working of this circuit is pretty simple, an input audio signal from a device such as a smartphone is taken through an electret mic. Here, a coupling capacitor of 0.1uF is used to block the DC component of the signal, allowing only AC to flow. This signal acts as a control signal to the base of the 2n3904 transistor (Q1).