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Thread: Making the MMB-4 active???

  1. #41
    some of the active setups use a stereo plug and use the 3rd wire as a power option so that's a possibility (without looking in depth at it)

  2. #42
    Member Arzi's Avatar
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    Hi Maddogm

    This is one option I was also thinking of. Have to buy one if this is the case. The preamp did not come with a jack so this was a disappointment...

    If I used a mono jack with some kind of wiring - could this result in a circuit that would keep the preamp active all the time? Meaning consuming the battery dry even with the cable not plugged in? That would be a bummer....

  3. #43
    Yep, it's designed to use a stereo jack to act as the power switching for the preamp. Inserting a standard mono plug into the stereo jack bridges the ground and SW via the plug's sleeve, which completes the power circuit turning on the preamp.

    If you really wanted to you could use another toggle switch or push/pull pot to act as your power switch, but a stereo jack is the easiest and more standard way of doing it.
    Scott.

  4. #44
    Member Arzi's Avatar
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    Thanks Scott. Will order one and go on from there.

  5. #45
    Member Arzi's Avatar
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    Help needed!

    I connected everything according to the diagrams here. No sound on the tap test.

    The wires on the pickups as they came were:

    Bare and green soldered together

    Red and white soldered together

    Black single

    These would indicate that the black is hot, bare and green are ground and white and red are -. Just like the SD pups.

    No luck getting any sound. Since I want to coil tap, I soldered the wires exactly like in the photo by Weirdbits.

    What to do next? I have the battery in place if anyone wonders.

  6. #46
    GAStronomist wokkaboy's Avatar
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    Arzi maybe check the output Jack connections. Might pay to post some close up pics and wait for Weirdy to chime in. Did you end up using a stereo jack?
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  7. #47
    Member Arzi's Avatar
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    Used a stereo jack. Changed the battery now and I get tap from front coils only. No humbucker or rear coils. This happens also when I switch to rear coils - the front ones give a tap.

  8. #48
    Post some pics of your toggle switches as that wiring is likely the issue if you're only getting one coil on each pup.

    Did you use the upper 'Parallel/Single coil/Series' layout or the lower 'Coil 1/Parallel/Coil 2'?
    Scott.

  9. #49
    Member Arzi's Avatar
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    The latter. Front, parallel,rear

  10. #50
    Did you separate the red and white wires?
    Scott.

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