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The -9v, Ground connections on the lower right are courtesy power in case you are doing a 2 in 1 effect that is also positive ground, ex. the Mangler with a Rangemaster or PNP Tonebender. In this combination, you only need to use one inverter to power both circuits. If you are doing a 2 in 1 and...
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Calibration To bias the Mangler, touch the black lead from your DMM to the TP pad under the Bias trimmer on the PCB and the red lead to any ground point on the circuit. Adjust the trimmer until your DMM reads approximately -4.5v. It does not have to be EXACTLY -4.5v…but keep it pretty close.
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Notes C1, C2 and C3 can be either axial or radial caps. The radial spacing is standard (5mm for C3, 2.5mm for C1 and C2). The axial spacing is 18mm for C3 and 23mm for C1 and C2. It doesn’t matter with type you use…the axial caps are for pure mojo.
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