Couple Questions about this PIE??

Discussion in 'Burnt Fingers DIY Effects' started by chazo64, Oct 16, 2021.

  1. chazo64

    chazo64 Tele-Meister

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  2. chazo64

    chazo64 Tele-Meister

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    I have a question about component marked CLR 18xI-M is that a clear led ,the foot note in respect to polarity, thats my take on it, but I need a second opinion. Thanks ahead of time.
     
  3. Flaneur

    Flaneur Poster Extraordinaire

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  4. vpittman

    vpittman TDPRI Member

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    I'm pretty sure it's a Current Limiting Resistor (CLR) for the off board LED. Usually (?) 4.7K
     
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  5. chazo64

    chazo64 Tele-Meister

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    Thanks that was my other thought. I havnt yet built anything with a current limiting resistor or any of the vactroll units is this like a vactroll ?
     
  6. chazo64

    chazo64 Tele-Meister

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  7. WalthamMoosical

    WalthamMoosical Tele-Afflicted Ad Free Member

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    Nah, it's not a vactrol, it's just there to keep the current through the LED low enough not to blow it out. If there is no resistance specified or suggested it's probably so that you can make your own decision about how bright you want your particular choice of LED to be. ... And THAT depends somewhat on whether you apply 9 V as listed or something higher or lower ... and THAT depends on whether the rest of the circuit is designed for it ... etc. etc.

    Probably 4.7 kohm is a good safe value if using 9 V.
     
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  8. chazo64

    chazo64 Tele-Meister

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    Thanks I can see why they leave the value blank now .
     
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