- 2 pin Molex connector KK254 Molex header 2.54 mm spacing Pin header 2.54 mm spacing D 3 pin Molex header 2.54 mm spacing R23, R24, R25, R27 Switch, triple pole double throw, illuminated paddle, http://www.nkkswitches.com/pdf/gwillum.pdf switch single-pole double-throw ON-OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D 10x DIP Switch, Single Pole Single Throw (DPST) Switch K switch dual double-pole single-throw OFF-ON D Single Pole Single Throw (DPST) Switch, temperature dependent K temerature switch dual double-pole single-throw OFF-ON D Double Pole Single Throw (SPST) switch, temperature dependent K temerature switch dual double-pole single-throw OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D 3x DIP Switch, Single Pole Single Throw (SPST) switch, small symbol D 5x DIP Switch, Single Pole Single Throw (SPST) switch, small symbol D 12x DIP Switch, Single Pole Single Throw (SPST) switch with 12 positions D 3 pin Molex connector 2.54 mm spacing Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 R3, R21, R27, R28 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>
The meaning and intended.