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Timer audio bleed from LED

Discussion in 'Burnt Fingers DIY Effects' started by jddub440, Apr 18, 2020.

  1. jddub440

    jddub440 Tele-Holic

    Jan 16, 2015
    Hello fellow forum members,
    I'm having an issue with some color changing LEDs I've been trying to put as a status indicator in some builds.

    I bought 10 slow color changing and 10 fast coloring changing LEDs....they have a built in timer in the LED that I believe is unadjustable.

    My overall issue is that I can hear timer speed when I activate the effect that I installed the LED into and it is as loud as the guitar, it does a sort of glissando, squeeker fart sound between color changes and sounds kinda cool but bottomline a problem for me.

    Does anybody know of a circuit or some other way I can isolate that LED color change sound from my guitars audio signal??
  2. sirbergersworth

    sirbergersworth Tele-Holic

    Aug 30, 2011
    St. Louis, MO
    I would think you would need a transformer to isolate it but I’m usually wrong. lol
    I tried one of those flickering leds before and he same issue.
  3. tubejockey

    tubejockey Tele-Holic

    Nov 25, 2015
    the bozone
    Start with moving all related leads and components away from audio, especially the inputs. If that doesn't suffice, power the LEDs from a source with good bypass caps. You may even need to use a smaller disc cap in addition to the large electrolytics to keep the ESR down at your specific frequency.
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