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Demodulation

Discussion in 'General Electronics Discussion' started by vick5821, Apr 19, 2013.

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  1. vick5821

    vick5821

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    Jan 22, 2012
    Any trustable circuit if I want to design a circuit that will demodulate an amplitude moduated(AM) signal ?

    Any suggestion schematic ?

    Thanks !

    Needed for my mini project ^^

    Need some guidance here :)

    Thanks ^^
     
  2. BobK

    BobK

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    I think you need an electric guitar to do that :)

    Bob
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Yeah, for simplicity, start with a crystal radio.

    From there, there are various things you can do to improve it. RF amplification before the detector is one. It should not be difficult to find resources for these on the web.
     
  4. Electro132

    Electro132

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    Feb 12, 2013

    Hey Vicki, i'm doing something similar but demodulating and then sending out through LED's. Want to work together? Let me know.

    Btw, crystal radio would be a good choice to start. Siilar to FM i think ...
     
  5. vick5821

    vick5821

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    Sure, but my project should end by mid of May HAHAHA
     
  6. john monks

    john monks

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    AM and FM are quite different.
    AM is amplitude modulation where the carrier strength is made larger and smaller.
    FM is frequency modulation where the carrier frequency is made higher and lower.
    What I suggested is for AM only.
     
  7. Electro132

    Electro132

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    Feb 12, 2013

    That's fine. I'm working on a project along those lines at the moment so if you're interested or if you know someone who's interested let me know. I'm up to the part of storing energy into a cap as in like a Li-Ion battery so i can use it for other parts in my project.

    Cheers
     
  8. HellasTechn

    HellasTechn

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    Apr 14, 2013
    Last edited by a moderator: Apr 27, 2013
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    The (not your) link was to a simple crystal radio with no varicap diodes in sight.
     
    Last edited: Apr 28, 2013
  10. HellasTechn

    HellasTechn

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    Apr 14, 2013
    That Link wasnt mine !
     
  11. HellasTechn

    HellasTechn

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    Apr 14, 2013
    Something like that with a preamplifier in the output maybe ?

    Pretty much same as john's diagram
     

    Attached Files:

    Last edited: Apr 27, 2013
  12. HellasTechn

    HellasTechn

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    Apr 14, 2013
    Disregard what i sayd about the varicap. Theese are used in FM modulation.
    My mistake.
     
  13. vick5821

    vick5821

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    Jan 22, 2012
    I need a transformer ? Is your circuit is aplication of AM demodulation ?

    TThanks
     
  14. dietermoreno

    dietermoreno

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    Dec 30, 2012
    A crystal radio can receive either AM or FM depending on the detector, and you would need different types of antennas for the higher frequencies used by FM.
     
  15. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    When you posted this it went right over my head but that was before I was enlightened! :)

    Chris
     
  16. vick5821

    vick5821

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    Jan 22, 2012
    How am I able to do a AM transmitter and receiver ? My friend will be doing the AM transmitter and I am responsible for AM receiver. Any suggested circuit ?

    No microcontroller is allowed

    Thanks :)

    Urgent help neded :(
     
  17. duke37

    duke37

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    Jan 9, 2011
    In the UK the rules about transmitting are very strict but some people do transmit VERY low power to activate old radios.

    Google 'pantry radio' , some are valve based and some, more convenient, semiconductor based.

    You will need to use a low frequency unless you are an expert so, run on medium wave and use a medium wave receiver. If you wish to build your own receiver I would suggest a TRF.
     
  18. vick5821

    vick5821

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    Jan 22, 2012
    I am doing for low frequency and low cost :)

    For my lab work project ^^

    Thanks !
     
  19. davenn

    davenn Moderator

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    Sep 5, 2009
    Look at post #12 Hellastechn gave you the most basic and cheapest AM receiver possible !! :)

    Dave
     
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