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Back74 **Component Count:** 76 | Refs | Qty | Component | Description | Vendor | SKU | | | Q1, Q2, Q3, Q4, Q5 | 5 | 2N3904 | Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount | | S1 | 1 | LED | Light emitting diode Push button switch with Signal Lamp, generic K switch sp3t ON-ON-ON D Switch, single pole double throw, separate symbols | | | C3 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | | | Tayda | A-001 | | | | Tayda | A-1672 | | | | | C2, C5, C6, C8, C9 D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 100V 0.15A standard switching diode, DO-35