Simple Mini FM Receiver Schematic
This schematic shows mini fm radio receiver with good performances and works great even if the sensitivity is not too high.
The oscillator of the radio fm receiver is adjusted between 87 … 108 MHz with C5.
Because of the synchronization, the oscillator output will have the same frequency deviation as the received signal from the fm antenna.
It is made of an oscillator (T2 and T3) that is synchronized with the received frequency of T1. This transistor works as a broadband preamplifier in VHF range.
The frequency modulated signal show up on P1 + R5. Low pass filter R6/C6 extracts the audio signal and then is amplifier by T4 … T6 and transmitted at the output through C9 capacitor.