SparkFun Sound Detector (with Headers) SF_Power Accessories Great for seeing the charge

Great for seeing the charge rate of your phone or tablet

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Real-world power dissipation consideration

SparkFun Sound Detector (with Headers) SF_Power Accessories Great for seeing the chargeThe SparkFun Sound Detector is a small and very easy to use audio sensing board with three different outputs. The Sound Detector not only provides an audio output, but also a binary indication of the presence of sound and an analog representation of its amplitude. The three outputs are simultaneous and independent, so you can use as many or as few as you want at once. The envelope output allows you to easily read amplitude of sound by simply measuring