Simple AM receiver

Discussion in 'The Projects Forum' started by crivoli, May 23, 2006.

  1. crivoli

    Thread Starter Member

    May 4, 2006
    26
    0
    My question is if I build this simple AM receiver and feed the output to the LM386 using a gain of 50, should the output to the speaker be good quality audio?

    I saw the datasheet for the LM386 and it shows an "AM Radio Power Amplifier" schematic, but can I use one of the other setups without having to add the "ferrite bead" etc... ?

    AM Receiver:
    http://www.electronics-lab.com/projects/rf/006/index.html

    LM386 datasheet:
    http://cache.national.com/ds/LM/LM386.pdf


    Thanks a ton
    -crivoli
     
  2. crivoli

    Thread Starter Member

    May 4, 2006
    26
    0
    Hey Guys Plz Help,

    I built the AM receiver circuit and fed the output to the "'AM Radio Power Amplifier" on the LM386 datasheet. I have everything hooked up except I am not using "ferrite beads" on the output of the LM386.

    I actually get a Radio Station around 900AM, but the sound is VERY VERY VERY low!!!

    I have the IC at a gain of 50 but I have ti put my ear right next to the speaker to hear it. I tried increasing the gain to 200 but no luck.

    Is there anything else I can do to increase the volume?Huh

    Thanks man
    -crivoli
     
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    First link shows up as blank page on Internet Explorer 6.

    If you are using the last schematic on the datasheet, then you need the bead. The three turns of wire around the bead make an inductor. The inductor and the capacitor make a filter. The filter makes the RF go away, leaving the audio. Your filter is limping along because you have no inductor.
     
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