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Update=Tue 20 Apr 2021 10:22:18 AM EDT 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-8/SOIC-8/TO-99-8 | | J4 | 1 | B10k | Potentiometer | | | C6, C7, C8, C9 | 5 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | | | .

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