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BackPSU/PSU.md | 5 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | J1 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x2 (see build notes) 1 SIP socket, 2.54 mm, 1x2 (see [build notes](build.md | | | | J3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>