Connect with us

Sound operated light source

Discussion in 'Electronic Basics' started by Maddy, Aug 29, 2008.

Scroll to continue with content
  1. Maddy

    Maddy Guest

    I am learning morse code. There are software available which convert
    any text into morse and give the output to the headphone jack. I was
    wondering if this sound output at the headphone/speaker jack can be
    used to power a LED or incandescent bulb? Would be thankful if anyone
    can suggest a solution.
  2. Bill Bowden

    Bill Bowden Guest

    The problem is the voltage signal at the headphone jack is probabaly
    much lower than needed to light an LED.

    You might try a transformer and put the low voltage side in series
    with the audio signal. Then use the higher voltage side to drive the
    LED, if you can get a couple volts out of it. Use a
    low power LED that lights with just a couple milliamps.

  3. ehsjr

    ehsjr Guest

    You did not tell us what device you are using, so it is
    impossible to state with certainty that it will not
    power the LED. It is doubtful that it will, but you
    can use the output to control another circuit that
    will power the LED. Is that what you want to do?

  4. Jasen Betts

    Jasen Betts Guest

    Maybe you could run software that displays a bar-graph of the sound
    output amplitude.

  5. neon


    Oct 21, 2006
    LED can you get 10 ma out i ruther think not. incandensed is just out. you need to amplify that sound and drive it. but then again what for speech 100hz to 5hz the led is just plain lit at all time.
  6. Maddy

    Maddy Guest

    Yes, I want the output to control another circuit that will power the
    LED. I am a novice and will be taking help from others , so would be
    thankful if you could tell me where I could find such a circuit.
  7. ehsjr

    ehsjr Guest

    See the following url:

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day