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With mods Light emitting diode Push button switch, generic, separate symbols, four pins D Push button switch, generic, two pins Switch, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | | | | R8, R10, R12 | 3 | 1k | Resistor | | | Tayda | A-553 | | 4 | 100k | Resistor | | | | | | J1 | 1 | Conn_01x04 | Pin header, 2.54 mm, 1x10 | | | S3 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x10 Pin socket.