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Back----------- | ---- | ---- | | | | J3 | 1 | SW_3PDT_x3 | Switch, dual pole double throw, separate symbols K switch dual-pole double-throw DPDT 3pdt ON-ON D Push button switch, push-to-open, generic, two pins | | | | | U3 | 1 | TL074 | Quad operational amplifier, DIP-14