DO-41 Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount | | Tayda | A-3486 or A-3487\*\*\* | | | Screws, nuts, and spacers (see [build notes](build.md)) | | | | | R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount | | | | | Tayda | A-4349 | | Tayda | A-1157 or A-2425 | | | Tayda | A-004 | | | | D 2 pin Molex connector 2.54 mm spacing"/>