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Passive AB switcher for twin-neck w/active and passive pickups

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  • Passive AB switcher for twin-neck w/active and passive pickups

    Hi all,

    I have a twin neck guitar with each 'neck' having a separate output jack. One 'neck' is passive, other is active.
    I have been working on making a remote controlled AB switcher that selects the correct neck for my current effect patch (this part is working fine).

    The problem lies with the switching circuit itself. I was told that the fact that one input would be active and the other passive meant that the two could not share a common ground and so the only arrangement I could see is as here. Where each pair of AC source and ground equates to a half-guitar.



    This of course results in a large pop upon switching.

    Is there any passive, tranformerless circuit available to me that will not pop upon switching yet keep the two inputs isolated (presuming this is indeed required).
    The relays I have available are SPST, DPDT and 4PDT.

    If not, would simply using a dual opamp to buffer each input prior to switching, then using a normal AB switch layout (of which there are many floating around) get around the issue of one half-guitar being active?

    As this will be operating before anything else in my signal chain it will need to retain the integrity of the signal from passive inputs.

    Hope someone can help!

    :-)

  • #2
    Your link doesn't work, but the "can't share ground" thing sounds like BS to me anyway.

    Proof: Presumably the guitar can be used with its outputs plugged into two different amps, or two channels on a mixer, or there would be a lot of unhappy customers. In both cases the outputs end up sharing a common ground.
    "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

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    • #3
      Originally posted by Steve Conner View Post
      Your link doesn't work, but the "can't share ground" thing sounds like BS to me anyway.
      Great that's what I wanted to hear!

      Thanks very much

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