![]() The radio receiver uses to optimize for that frequency. All stations have set a fixed carrier frequency for sufficient selectivity.įor the modulator to work with any radio signal, we convert the carrier frequency of any radio signal to Intermediate Frequency (IF). ![]() By tuning to the channel, you are tuning the nearby oscillator and RF tune-able channel at the equivalent time. RF-to-IF receivers incorporate an oscillator with a variable frequency (differs from RF carrier frequency). There are two stages of AM receiver which are RF and IF (filtering and amplification). Inductor coil is equivalent to 80 turns of 26 s.w.g enameled copper wire twisted on a toilet paper roll. And afterward, the signal identifies by the OA91 diode and amplify by the BC547 transistor. It gets the signals through the antenna which is a receiving wire. The 80 turns inductor and 365pF variable capacitor structure a loop circuit. The schematic that appeared above is a basic AM receiver circuit that utilizes just a single transistor and some different segments.
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