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Aguilar OBP-3 - Mid push/pull pop?

Discussion in 'Pickups & Electronics [BG]' started by FunkMetalBass, Apr 26, 2010.


  1. FunkMetalBass

    FunkMetalBass

    Aug 5, 2005
    Phoenix, Arizona 85029
    Endorsing Artist: J.C. Basses
    The thread title really says it all. Anybody have any suggestion for eliminating that damn pop when the mid push/pull is used? I suspect it's something to do with the two unused lugs.
     
  2. GODSBASSMAN

    GODSBASSMAN

    Feb 2, 2005
    S. Carolina
    See the Aguilar site wiring diagrams, very helpful. has to do about resistors in the circuit.
     
  3. Yep, resistors across the switch terminals should do it.
     
  4. Rano Bass

    Rano Bass

    Sep 9, 2006
    Tijuana Mex.
  5. FunkMetalBass

    FunkMetalBass

    Aug 5, 2005
    Phoenix, Arizona 85029
    Endorsing Artist: J.C. Basses
    I've found some 1M resistors in 1/4W, 1/2W, and 1W - Which should I use?

    If my physics knowledge is correct, running the preamp at 9V will need at least the 1/4W and the 18V will need at least the 1/2W?
     
  6. It doesn't matter what you wattage you use, they should all be sufficient.

    Your entire preamp circuit draws about 0.009 to 0.018 watts at 9V, or 0.018 to 0.036 watts at 18V. Well below the 0.25 watt limit of your lowest wattage resistors.
     
  7. FunkMetalBass

    FunkMetalBass

    Aug 5, 2005
    Phoenix, Arizona 85029
    Endorsing Artist: J.C. Basses
    Ah, okay, that's perfect then. RadioShack has a 5-pack of resistors for $0.99 and I've got two basses that need this mod. Thanks, L6M.
     
  8. I misplaced the decimal point in the part you quoted, read the post again.
     
  9. FunkMetalBass

    FunkMetalBass

    Aug 5, 2005
    Phoenix, Arizona 85029
    Endorsing Artist: J.C. Basses
    Can I ask how you calculated those? Either I'm estimating incorrectly, or I suck at crunching numbers (go figure that I'll be receiving a math degree w/ a physics minor soon...)

    :rollno:
     
  10. It's a very simple formula:
    Voltage * Current = Wattage

    V= 9 or 18.
    I= 0.001 to 0.002.
     
  11. FunkMetalBass

    FunkMetalBass

    Aug 5, 2005
    Phoenix, Arizona 85029
    Endorsing Artist: J.C. Basses
    The current is where you've lost me. I was just using P = V^2 / R.
     
  12. wvbass

    wvbass Supporting Member

    Mar 1, 2004
    West Virginia
    V=IR, so I = V/R

    So,

    P = V * I

    is the same as

    P = V * V/R

    or

    P = V^2/R

    No reason to get lost. You two said the same thing.

    I am interested in where the numbers for the OBP-3's current draw came from, though.
     
  13. See, you're overcomplicating things.

    The way I saw it was that if I'm looking for a measure of wattage, I don't know how much current is being passed through the resistors in that part of the circuit, so I just looked at how much current is drawn by the preamp as a whole, which is a couple of milliamps at most.
    The preamp is running on 9V or 18V, so I can just multiply by the current, and there is my maximum wattage.

    FWIW, these resistors are just there to quiet the switch pop, they aren't really a part of the EQ circuit.
     

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