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Electronics Technology: Decibel Sound Pressure Level Meter Circuit This is a design for decibel meter circuit. This circuit is used to measure sound pressure level (SPL) from about 60 to 70 dB.
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Electronic Project: Audio Level Indicator (Meter)
Decibel Sound Pressure Level Meter – Electronic Circuit Diagram
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Everything You Wanted To Know About Sound Level Meters (SLMs) - ProSoundWeb
Sound Level Meter - Electronics-Lab.com
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Making a SPL dB Meter | Embedded Lab
