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Sound level meter circuit using IC LM3914 - Gadgetronicx
Simple Battery Level Indicator Circuit using Op-amp
Analog VU meter circuit using transistors
Audio Indicator LM741 Circuit Project
A basic volt-level indicator using LM339 comparator and a row of four
Make a Battery Level Indicator using LM339 IC (Part 7/9)
Audiolevelmeter met LM3915 – DJO Amersfoort