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...a magnet has a North and a South pole. As the North pole passes the pickup a voltage is induced (lets assume its polarity is positive (+)) and then the South pole passes the pickup, so now a negative (-) voltage will be produced. If these two voltages are "read" as absolute voltages (meaning 'sign' was ignored) then you'd "see" a double-pulse like you mentioned.
...how can the absolute voltage be created? by rectification (diodes) or active circuits.
...what did you use to capture (visualize) those pulses?
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