Fm Radio Circuit Explained. Figure below shows a low parts count fm radio based on a tda7021t integrated circuit by nxp wireless. An antenna is used to catch the desired frequency waves.
Fm radio circuit principle. How the one transistor fm radio receiver works as mentioned above the circuit is basically a single transistor superregenerative rf oscillator with a constant amplitude. The bulky external if filter transformers have been replaced by r c filters.
This component s job is to amplify the weak signal that comes from the detector so that it can be heard.
Add tip ask question comment download. The input audio signal from the mic penetrated to the base of the transistor which modulates the lc tank circuit carrier frequency in fm format. Fm radio circuit principle. This circuit has been simplified from figure 5 in the nxp datasheet.
