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LM3914 VU Meter circuit | ElecCircuit.com
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Index 30 - LED and Light Circuit - Circuit Diagram - SeekIC.com
LED Sound level display circuit by using IC LM3915 | CircuitsTune
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8 LED Audio Level Meter - Electronic Schematic Diagram
Sound Operated LED
Sound Activated LED (ART217E)
Schematic & Wiring Diagram: November 2011
LM3914 VU Meter circuit | ElecCircuit.com