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R14, R15 values changed\ndue to availability Kassu used 1 µF \npolyester film looks much \nbetter. Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-14/SOIC-14 | | U2 | 1 | Conn_01x10 | Pin header 2.54 mm spacing 2 pin Molex header 2.54 mm 2x5 Audio Jack, 2 Poles (Mono / TS) | | | D1, D2, D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching.

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