Why do some pedals ÁPOP! when engaged?

Discussion in 'Effects, Pedals, Strings & Things' started by beachwail, Aug 22, 2005.


  1. beachwail

    beachwail Member

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    Why do some pedals ÁPOP! when engaged?

    Referring mostly to my Menatone TBIAC. Great sounds, but I can definitely hear when I'm clicking this thing on or off. Very loud pop. It's not the "static buildup" situation either because it doesn't matter how many times I depress the pedal...

    Anybody have similar experiences---remedies? ??
     
  2. devbro

    devbro Member

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    1. Isolate the offending effect
    2. Check your cords (chances are it's a ground issue)
    3. Get a Loooper (fixed my problem)
    4. Add a pulldown resistor to the offending effect
     
  3. beachwail

    beachwail Member

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    1. Isolate the offending effect
    my Menatone Top-Boost-IAC

    2. Check your cords (chances are it's a ground issue)
    Nope. Just the pedal.

    3. Get a Loooper (fixed my problem)
    Don't have the pedalboard real-estate!

    4. Add a pulldown resistor to the offending effect
    Not sure what this means....? Is it a mod to the effect?



    Thanks!
     
  4. John Phillips

    John Phillips Member

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    Is the TBIAC the last pedal before your amp? Or if there are any pedals following, are they 'true' bypass and turned off? If so, try changing the first preamp tube - DC leakage from the amp is a common cause of this.

    If not that, it could be either a DC leak from another pedal (either before or after the TBIAC) or a failing cap in the TBIAC itself. Or, it could just be a faulty switch, but a DC leak somewhere is actually more likely. This is not the same as 'static', and can't be discharged by cycling the switch.
     
  5. PaulC

    PaulC Member

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    Sometimes it's not the true bypass pedal that is doing the popping - it's a non true bypass pedal before or after it. Alot of those will have a cap on the input/output that doesn't have a bleeder resistor on it to bleed off the caps charge. The true bypass switch will hard connect these allowing them to pop.

    Later, PaulC
     
  6. beachwail

    beachwail Member

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    Thanks for the replies guys.
    Wow, who would have thought it could have been another pedal.... Here's my current chain:

    Hamer Newport Pro>>
    Peterson SS >>
    Barber Tone Press >>
    Menatone TBIAC >>
    Hermida Zendrive >>
    MI Audio Blue Boy >>
    Boss GE-7 (sniper mod) >>
    Digitech Digiverb >>
    Line6 DL-4 >>
    Direct-in /or/ Laney LC-30 /or/ Dr.Z Z-28
    (depending on how small the gig)

    I'm using Dimarzio cables and George L pedal connectors.
    Not a damn complaint (except the Digiverb sounds kinda
    crappy:() other than the POP on the TBIAC (happens during
    both engage and disengage).
     
  7. John Phillips

    John Phillips Member

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    OK... it can't be an amp problem (or the Digiverb or DL-4) since the Boss GE-7 is buffered and effectively breaks the chain there, for DC leakage.

    Are the Zendrive and the Blue Boy both 'true' bypass?

    If they are, does the TBIAC pop if either of them are on? If no, the problem is the GE-7, since the pedal that's on is breaking the DC chain.

    I'm assuming it's not the Peterson (if it's set to 'true' bypass') or the Barber, if the TBIAC pops when it's not on.

    It could still be a problem with the TBIAC itself, but you should be able to eliminate the others first. Is there any combination of the other pedals which stops it?
     
  8. beachwail

    beachwail Member

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    John--

    I will do some tests this evening.

    To my knowledge, all pedals are true-bypass except
    for the GE-7 and Digiverb.
     
  9. beachwail

    beachwail Member

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    I think I have a problem with the TBIAC unit itself.

    Guitar >>
    TBIAC >>
    Amp

    It still pops, loudly at that. Tried battery and AC tap.

    Is this something I can fix within the pedal?
    I'd really rather not set up a looper just for this
    imperfection.

    Thanks.
     
  10. beachwail

    beachwail Member

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    I found this posted solution:

    To avoid pops, you need a 1M resistor from the input of the circuit to ground and a 100K from the output to ground, this will discharge the coupling caps in the circuit.

    Question is, will any old resistor do the trick?
     
  11. Rid

    Rid Senior Member

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    Well it will for sure remove some top.
    What is the point then?
     

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