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BackON-ON horizontal MEC 5G single pole normally-open tactile switch K reed magnetic switch D reed switch, default-closed D SPDT reed switch K switch normally-open pushbutton push-button D MEC 5G single pole double throw, separate symbols | | L1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/>