audio signal triggered LED

Discussion in 'General Electronics Chat' started by stainlessbrown, Feb 21, 2010.

  1. stainlessbrown

    Thread Starter New Member

    Feb 21, 2010
    5
    0
    Hi there

    I'm looking for a simple circuit to take the output signal from a DAW and send it to a circuit to trigger a red (preferably) LED. The signal source will be the output from a digital metronome. I do not know the exact signal strength, but it would normally be sent to a power amp in order to run it through speakers. The metronome pulse can be adjusted from sounding like an old Pong game to a cowbell, claves' or woodblock. So frequencies (like color organs) is not much of an issue.

    I need something capable of upwards of 160 - 180 beats (blinks) per minute.

    The purpose for this is I've noticed that a metronome (click track) in the headphones of someone recording tends to compete sonically with what they're placing (especially percussionists) and I think a visual 'cue' would work well

    thanks to anyone who can help!

    Stainlessbrown
    Sacramento
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
    761
    57
    Hello. If the signal outputted by the digital audio workstation is analog (as I assume as can be fed to an audio amplifier) the circuit I would use to make it simple is a LM3915, or LM3916, or LM3914 integrated circuit and select one of its output pins to hook up your LED, or several, depending at what signal strength you want it to come on.

    In a kit, this or similar should work for you :
    http://www.cpcares.com/CanaKitCorp/CK104.html
     
  3. stainlessbrown

    Thread Starter New Member

    Feb 21, 2010
    5
    0
    Externet

    thanks- the kit would be great (not to mention quick and cheap) but I really just need a single LED (the VU meter approach might get confusing)

    I'll look at the LM391x
     
  4. stainlessbrown

    Thread Starter New Member

    Feb 21, 2010
    5
    0
    would it damage the IC to tie the output together to fire the LED with any level of signal?
     
  5. Externet

    AAC Fanatic!

    Nov 29, 2005
    761
    57
    For the kit, remove the unwanted leds from the board. For the LM391X, connect only one LED to any chosen output.

    There is other kits in that site with a built-in microphone that will trigger the light by ambient sound instead of connected audio.
     
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