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Why is the pickup ground separated from the jack ground?

April 26, 2017ground Jack pickup separated

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Why is the pickup ground separated from the jack ground?

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We developed a split power supply so we can DC couple the pickup signal to the input of the amplifier. This allows us to move the capacitive coupling to the output signal, which has a low impedance drive source, instead of having it coupled at the pickup side which is a high impedance signal. This provides a cleaner signal path.