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Editing Step 12 —

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To oscillate the mirror, alternating electrical current at high frequency is passed through a copper coil attached to the mirror. A stationary iron core is attached to the display unit, forming a solenoid to produce the motive force needed for oscillation.

To tell the oscillator circuitry how fast the mirror is moving, an arm attached to the mirror passes back and forth through an optical sensor attached to the lower circuit board.

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