The FM modulator circuit
FM modulators come in two forms: wireless and hard-wired. A wireless FM modulator (also referred to as an FM Transmitter) plugs a listening device straight into your car's cigarette lighter socket. The wireless FM modulator then broadcasts a weak, low-range signal so your car's radio can pick it up and play it.
Fm modulator can be made by many ways eg:- Using 555 timer, Comparators, Operational amplifier adjusted in series of circuits
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