FM and AM receiver

Discussion in 'Electronics Resources' started by brahms, Jul 29, 2014.

  1. brahms

    Thread Starter Member

    May 9, 2014
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    0
    Hi guys, i'm wondering if anyone here can give me a working schematic or a link where i can find a working circuit of FM and AM receivers.. The simpler the better. Been searching and have done some that i have seen in the net but it's all faulty..

    Thanks in advance!
     
    Last edited: Jul 29, 2014
  2. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    You want a simple radio circuit?
    Then you would't find both AM and FM together unless it is a commercial chip.

    For a simple AM radio, try this:

    [​IMG]
     
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  3. mitko89

    Member

    Sep 20, 2012
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  4. bertus

    Administrator

    Apr 5, 2008
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  5. alfacliff

    Well-Known Member

    Dec 13, 2013
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  6. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
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    I have built AM and FM transmitters from web schematics, yes, they are often incorrect, dont incllude component values, or need transistor types you dont have.

    With some research it is possible to make them working, for instance there is often no adjustable resistor in the emiiter path, which you need by all means for two reasons:

    -the hFE is incorrect, you get too much gain or not enough. Maybe the original author just tried until he found a working transistor, and then just wrote the type number.

    -you use a substitute transistor, which normally should work, but the circuit is too much specific, so without changing the offset, the transmitter or receiver simply does not work.
     
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  7. AlphaDesign888

    New Member

    Jul 27, 2014
    189
    10
    IC TDA7000 makes an good mono FM radio. Very easy to build. Cheap IC.
     
  8. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
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    building an fm radio is more dificult than an am radio, the higher frequencies make lead lengths more critical and much more. there are lots of information on proper parts layout and fabrication in the ARRl amatur radio hamdbook or the RSGB handbook. actual hints from people who have been building ricievers and transmitters for a long time.
     
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