LW/L AM Radio Transmitter low powered 9v/12v

Discussion in 'Wireless & RF Design' started by Tony Elliott, Sep 26, 2015.

  1. Tony Elliott

    Thread Starter Member

    May 8, 2015
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    Hi, I am looking to build a AM Radio Transmitter that can run on a 9v or 12v battery. it needs to transmit across a room and have a good signal so I can hear the transmitted sound on the LW radio.
    I was looking at a few schematics and found an old forum but as it was from 2012 it seemed no one was replying.
    http://www.electroschematics.com/6821/basic-low-power-am-transmitter/#comment-1811875
    The attached schematic has a two components I am unaware of L1 450uH and L2 450uH
    any ideas what these are?

    Or

    Please can anyone share a better tried and tested schematic of a LW/L AM Radio Transmitter low powered 9v/12v?
     
    Last edited: Sep 26, 2015
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    L1 and L2 are inductors, like these.

    That transmitter should work, although the modulation will be asymmetrical (not exactly HiFi). Lots of detail missing on how to accomplish the modulation...
     
  3. Kermit2

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    Feb 5, 2010
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    [​IMG]
     
    Tony Elliott likes this.
  4. Tony Elliott

    Thread Starter Member

    May 8, 2015
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    Thank you for those links I'll have a look:)
     
  5. Tony Elliott

    Thread Starter Member

    May 8, 2015
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    This looks a great schematic! Could you please tell me what is C1 500p (variable capacitor?), L1 200uH (resin copper wire gauge?) and LW (ariel length)? Are there any links you could post for examples please?
     
  6. Kermit2

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  7. Tony Elliott

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    May 8, 2015
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  8. Art

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    Sep 10, 2007
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    Last edited: Sep 28, 2015
  9. Tony Elliott

    Thread Starter Member

    May 8, 2015
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    Yes I tried this but I have had trouble in the UK buying the right audio transformer 1000ohms - 8ohms.
     
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