Series/Parallel with Kill in the middle

Discussion in 'Pickups & Electronics [BG]' started by llldino, Jan 10, 2013.


  1. llldino

    llldino

    Joined:
    Dec 16, 2012
    Hey. I'm going to put a series/parallel 3-way switch on my jazz bass. There are several diagrams online showing how to do this but they are all for 2 way switches. I want a 3 way switch where the middle is a kill switch (an off switch if you will):

    Up pos - Series
    Center - Off
    Down pos - Parallel

    I assume I need a DPDT with a wire for the center position grounded or a DP-Center off switch. Not sure what the difference is. Help is appreciated. :)
  2. line6man

    line6man

    Joined:
    Jun 20, 2008
    Location:
    Close to Los Angeles, CA
    You can use a DPDT On/Off/On, but there may be a concern for hum in the "off" position, as you will have a big coil of wire connected to the hot. It shouldn't be an issue if the output impedance from the pots is low enough, but who knows.
  3. Jazz Ad

    Jazz Ad Mi la ré sol Gold Supporting Member

    Joined:
    Mar 16, 2002
    Location:
    Reims, Champagne, France
    If you use a 3pdt before volumes, you won't have the hum issue.
    I'm not sure if there are on-off-on 3pdt though.
  4. T-34

    T-34

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    Aug 11, 2005
    Location:
    France, Paris region
    They do exist.
  5. llldino

    llldino

    Joined:
    Dec 16, 2012
    Bumping this. If anyone has access to schematics that would be appreciated.
  6. line6man

    line6man

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    Jun 20, 2008
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    Close to Los Angeles, CA
  7. llldino

    llldino

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    Dec 16, 2012
    So the toggle (DPDT) would have six soldering positions, like the piece above the vol pot in the diagram? I'm still a little confused. I want a 3 way on-off-on, so would that also have 6 positions? Like I said in the op, I would like series/off/parallel, but I could settle for a 2-way series/parallel if the other way isn't possible
  8. line6man

    line6man

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    Jun 20, 2008
    Location:
    Close to Los Angeles, CA
    The wiring is the same, as the pin layout is the same for mini toggles as push/pulls, and you're just using a DPDT On/Off/On switch instead of a DPDT On/On.
  9. llldino

    llldino

    Joined:
    Dec 16, 2012
    Okay, thanks a bunch for your help. I didn't think a 2-way and a 3-way switch would have the same pin configurations, but I won't ask questions.
  10. Jazz Ad

    Jazz Ad Mi la ré sol Gold Supporting Member

    Joined:
    Mar 16, 2002
    Location:
    Reims, Champagne, France
    With a 3pdt you do the same, just you rig the signal from the neck on the 3rd channel. This way in 3rd position pickups are completely disconnected.
  11. line6man

    line6man

    Joined:
    Jun 20, 2008
    Location:
    Close to Los Angeles, CA
    DPDT On/Off/On just means DPDT On/On with a third position that doesn't connect anything.

    No, it would be preferable to short the output rather than leave it open. The load of the pots provides a finite impedance at the output, but a direct short is the best was to ensure the least amount of hum possible, as the output impedance will approach zero.
  12. Jazz Ad

    Jazz Ad Mi la ré sol Gold Supporting Member

    Joined:
    Mar 16, 2002
    Location:
    Reims, Champagne, France
    You're right, it is a better and simpler approach.
  13. Cadfael

    Cadfael

    Joined:
    Jan 4, 2013
    Location:
    Germany, EU
    Just an add on ...

    You find the "DiMarzio Dual Sound" and "Ibanez TriSound" wiring (small difference) in theorie chapter 3.7.15 of my compilation.
    Because of the schematic diagram you see, that both wirings are possible with an ON/ON, ON/ON/ON and ON/OFF/ON.

    The ON/OFF/ON does what the TE wants.

    Please have a look at chapter 3.4.4 as well.
    There are the mini-switch namings as I found out.
    Please let me know if you think/know, they are wrong (best with quotation).

    I have named the double ON/OFF/ON as DPCO ...

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