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BackSwitch dual double-pole single-throw OFF-ON D Single Pole Single Throw (SPST) switch D Switch, three position, single pole double throw K switch SPST LED OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D Switch, three position, dual pole double throw, separate symbols | | J3, J4, J5 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92