Part="LM2904"> Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Audio Jack, 2 x 6mm drills Triple banana socket, footprint - 2 pin Molex header 2.54 mm spacing | | J3, J4, J5 | 3 | 2_pin_Molex_header | KK254 Molex header 2.54 mm spacing | Tayda | A-804 | | Screws, nuts, and spacers (see [build notes](build.md)) | | | U2 | 1 | LED | Light emitting diode | | | C3, C4, C11 | 2 | 1M | Resistor | | R15, R17, R19.
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