OLEDiUNO Spectrum Analyzer with 3 display modes

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Spectrum Analyzer by Andrew Holme -- Homemade spectrum analyzer constructed from sweep generator, VCO and amplifier, IF amplifier, 2nd local oscillator, and mixer logarithmic IF modules. http://www.homemadetools.net/homemade-spectrum-analyzer

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Arduino / Processing Audio Spectrum Analyzer

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Tutorial: Arduino and the MSGEQ7 Spectrum Analyzer

Sansui WS-G10 Stereo Graphic Equalizer – 10 band with Spectrum Analyzer

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