Connect with us

Best Audio Clipping Ind Circuit

Discussion in 'Electronic Design' started by Paul kent, Feb 10, 2011.

Scroll to continue with content
  1. Paul kent

    Paul kent Guest

    I am driving a 12W audio amp module from a PC soundcard and would like
    to fit an _adjustable_ clipping indicator.

    Would like to keep the circuit as simple as possible. Not a hi-fi
    application. It's just because the PA speaker is in another room and I
    cannot hear if distortion occurs.

    What are the pro's and cons of the circuits below? Any other
    suggestions?

    http://electroschematics.com/5942/audio-clipping-indicator/

    http://electroschematics.com/302/peak-indicator-circuit-schematic-tlc272/

    The next is simple, but not adjustable, and would need to be modified
    for a 12VDC supply.

    http://electroschematics.com/5942/audio-clipping-indicator/
    (fourth diagram down)

    Thnak you for any advice.

    Paul Kent
     
  2. Paul kent

    Paul kent Guest

    Nice, but I want a small circuit I can build into a device. Sorry, if
    that wasn't clear.

    Paul Kent
     
  3. This isn't too bad, but it will vary in sensitivity with the battery
    voltage. A low power regulator driving R2 and R4 will fix that.

    There's a very long list of things wrong with that one.

    Same link.


    Since this isn't hi-fi, feed the speaker output to a 47 Ohm resistor,
    then to a bridged rectifier, then to a string of cheap LEDs. The more
    LEDs in series, the higher the illumination threshold. It will probably
    be around 8 red, 6 green, or 4 blue/white. 12W RMS into 8 Ohms is the
    typical quoted output of a bridged amplifier running on 14.4V.
     
  4. Paul kent

    Paul kent Guest

  5. Not bad. A 4.7V zener diode may be wrong for a 12W amp. An adjustable
    voltage divider may be better.
     
  6. Ralph Barone

    Ralph Barone Guest

    I had long forgotten a circuit I did decades ago to do exactly this. I've
    just written it up and added it to 4QD TEC:

    http://www.4qdtec.com/Audio/SPPPI.html Speaker powered Peak Program
    Indicator

    Enjoy![/QUOTE]

    Do you get a long enough optical pulse out of the LED to "see" the
    clipping, or should you throw a small capacitor somewhere in the circuit?
     
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

-