ROTATING SPROCKET WHEEL LISSAJУUS GENERATOR. The circuit described here utilizes a Lissajуus-pattern generator in conjunction with any typical analog oscilloscope capable of displaying x- and y-axis waveforms. The circuit displays an image of a slowly clockwise-rotating, six-tooth sprocket wheel. It employs several interesting techniques, including a digital timebase generator, a sine-cosine ("quadrature") synthesizer comprised of two finite-impulse response filters, and an amplitude commutator.
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