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| J12 | 1 | LED | Light emitting diode | | | | | | J12 | 1 | 1uF | Unpolarized capacitor | | | Screws and spacers (see [build notes](build.md)) | | | | | | | | | | | | Tayda | A-1531 or A-557 | | | | | J1 | 1 | B20k | Potentiometer | | Q1, Q2, Q3 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>

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