Strobe dots

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    There is a LED enclosed at the left which flickers at the turntable's platter speed (eg. 33 1/3 RPM), which then results in one of the lines of dots appearing to be stationary.

    In the case of 33 1/3 RPM, the largest dots appear not to be moving. Speeding up the turntable eventually causes the higher dots to stay, and vice versa.

    Rob Russell and kjbonathan added this photo to their favorites.

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