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Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7, R30, R31 Switch, dual pole double throw, center OFF position K switch single-pole double-throw spdt ON-ON horizontal MEC 5G single pole normally-open tactile switch SPST LED OFF-ON lamp D Single Pole Single Throw (SPST) switch, small symbol D 3x DIP Switch, Single Pole Single Throw (SPST) switch with 12 positions D 2 pin Molex header Operational amplifier, DIP-8 | | D3, D4, D5, D6, D7, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35 Pin header 2.54 mm spacing Q1, Q2, Q3 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/> Small Signal NPN Transistor, TO-92 KK254 Molex connector 2.54 mm 2x5 Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | | | | U3 | 1 Consider replacing transistor through-holes with sockets or with modifications and/or translated.

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