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R15, R20, R22 | 2 | 1 | 1 Kosmo_panel | 2 | 1 | 10R | Resistor | | | S1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | | Tayda | A-4349 | | | U3 | 1 | LED | Light emitting diode Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | J4 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch.

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