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| Operational amplifier, DIP-8 | | | | | | | | R31 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch ON-ON | | | | U1 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x10 Pin socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | J5, J12, J13 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm vertical board.

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