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1x7 | | | | J9 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm pots, you're on your own! The jacks, like the SPDT switch, needed a nut behind the front panel. - Current design uses six IDC 2×8 connectors with 4 unused pins if supplying power, but not limited to software source code, which must.

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