Top suggestions for Pocket FM Radio Receiver Circuit Key Components T1 (BF494): An RF (Radio Frequency) NPN transistor that acts as the regenerative detector and oscillator. T2 (BC559C): A PNP transistor used for audio amplification to drive the speaker. L1 & C2: The tuning network. Adjusting the variable capacitor C2 or the coil L1 changes the frequency you receive. L2: An RF choke consisting of 20 turns of 25 SWG wire on a 5mm diameter former. How it WorksReception: The antenna picks up FM signals, which pass through C1 to the base of T1. Demodulation: T1 detects and demodulates the FM signal into an audio signal. Amplification: The audio signal is coupled via C3 to the base of T2, which amplifies the current to drive the 400 Ohm speaker SP1. Power: The circuit operates on a standard 9V battery. |
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