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BackWith LED, generic D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | R20, R22 | 2 | 4.7k | Resistor | | | | | R30 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8