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FM Receiver Circuit Help

Discussion in 'General Electronics Discussion' started by Maoyuusha, Nov 11, 2017.

  1. Maoyuusha


    Nov 11, 2017
    I need help for my circuit shown below. This was my project for the semester but I can't get it to work. My professor gave me advice and said that I didn't have a de-modulator and there might be an IC that could make it work if not then I needed to create and add a demodulating block which I guess should be somewhere beside C2. This project will determine if I pass or fail the subject, I have 1 week left to finish it and I'm stucked. :(

  2. Audioguru


    Sep 24, 2016
    Your transistors are not biased properly so they will not work.
    I think you can make your circuit a "super regen radio" (many circuits are in Google). It basically detects (demodulates) AM but if it is tuned to one side of an FM station's frequency then it detects FM with "slope detection".
    Will your professor allow you to simply copy a design by somebody else?

    Or you can learn about FM radios then make an FM demodulator.

    Your LM386 is missing the important series RC "zobel network" from its output to ground as shown on every circuit in its datasheet.
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