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Attaching an LED to radio

Discussion in 'General Electronics Discussion' started by tarhorse, Feb 28, 2011.

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  1. tarhorse


    Feb 28, 2011
    Hello there everyone, I am working on a project for school where I want to take an existing radio and attach an LED that will respond to the amplitude of the signals being received by the radio, is this possible? is this a ridiculous idea? If anyone has any suggestions or references to relevant helpful material, please let me know. Thanks a bunch.
  2. davenn

    davenn Moderator

    Sep 5, 2009
    yes it is possible. even better using a LED bargraph display to have a really good "S" Meter (Signal Strength Meter). Where you will run into problems is seeing if there is a place to extract RSS (received signal strength) voltage, without a circuit diagram of the radio its going to be very difficult.
    Some FM receiver IF (Intermediate Frequency) chips have an output pin specifically for that purpose.

  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Finding the AGC can be a good place to start :)
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