WEBVTT

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I realized a magnetic short circuit between 2 coils, 1 powered and 1 able

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The primary on the left controlled by the pusher, the secondary on the right connected to the galvanometer

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An induced voltage is obtained at each change of state: pressing or releasing the pusher!

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Zoom: despite sending only one polarity, the coil generates the missing alternation!

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This is how most ubiquitous switching power supplies work!