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Mini Decibels - a Simple Volume Meter With an Electret Mic & LM3916 : 3 Steps (with Pictures) - Instructables
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Amazon.com: Douk Audio VU2 MIC & Line Dual VU Meter, Analog Sound Level Indicator, 4-Way Splitter Switch, Audio Switcher Box for Speaker/Amplifier/Preamp (Light Version) : Electronics
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