My Geophone circuit board works

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=lkqiOmewn_w

My Geophone board is made after a 10 led level indicator board that uses a LM3915 led light bar chip. • • Parts: • 1 each UA741 General Purpose Operational Amplifier • Datasheet https://www.ti.com/lit/ds/symlink/ua7... • 1 each LM3915 Dot/Bar Display Driver • Datasheet https://html.alldatasheet.com/html-pd...

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