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Mm Small Signal NPN Transistor, TO-92 Operational amplifier, DIP-8 100V 0.15A standard switching diode, DO-35 | | U2 | 1 | LED | Light emitting diode Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | Screws, nuts, and spacers (see [build notes](build.md | | Tayda | A-804 | | C3.

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