small receiver & transmitter

Discussion in 'The Projects Forum' started by jeffc, May 18, 2011.

  1. jeffc

    Thread Starter New Member

    May 17, 2011
    can any one help please i need to build a very small receiver & transmitter as slim as posible.they would need to have sound to go off when they are 10 feet apart i will keep my little lad close..thanks. i am very new to this so if i break any rules please let me know as i am a bit thick that way...
    Last edited: May 18, 2011
  2. KJ6EAD

    Senior Member

    Apr 30, 2011
    Are you saying that you want the receiver to emit some audible alarm when the transmitter has moved 10 feet away from it?
  3. Wendy


    Mar 24, 2008
    No rules are broken that I know of. Welcome to AAC.

    I thought there were commercial versions of those out there? The exact distance will vary.
  4. wayneh


    Sep 9, 2010
    You might be able to use bluetooth. My cellphone phone shows an alert if/when a paired device goes out of range. Put one of those cheap earphone things in a pocket.
  5. Wendy


    Mar 24, 2008
    It would be much better to use a commercial radio, connect something to the earphone jack that would sound an alarm if the signal fades away. Transmitters are typically easy.

    The more experienced you are with electronics the easier it will be to make it small. Soldering is a skill involving practice. Let us know how you want to approach it, and the location in the world where you are at. It matters as to parts you can get.

    Really small involves printed circuit boards.