Gadget Design (RF Emitter?)

Discussion in 'General Electronics Chat' started by mdaws, Jul 29, 2007.

  1. mdaws

    Thread Starter New Member

    Jul 29, 2007
    1
    0
    I'm trying to design a small gadget for a class project, and I was hoping to get some help with the necessary components.

    Part I: I want something like 2 plates when they are in close proximity that can emit some sort of signal. (I was thinking maybe there is a cheap commercial form of something similar to RF id cards?)

    Part II: I want another two plates which can pick up the signal from Part I if it is emitting and when these two plates themselves are separated and the other two plates are close a sound is produced.

    Thanks!!!
    Matt
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    That sounds a bit other worldly. Is there some new physiscs in there? I'd be fascinated to learn more.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Your description is a bit hard to imagine. Can you expand on the concept of "plates"? To take a guess about something that might be satisfactory, google "theramin" for an idea.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Er, it's "Theremin" there, beenthere ;)

    That's your starting point - a Theremin (named after it's inventor.)

    Google that, and look at the Wikepedia entry. See if it fits.
     
  5. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
    You can hand wind a couple of coils, one coil is fed by low voltage AC and the other one goes to a speaker. You can even have the 2nd coil be powered by the ac and make it louder. It's not efficient but it works. Easiest is to light an LED.
     
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