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Back| ----------- | ---- | ---- | ---- | ----------- | ---- | | C3, C4, C11 | 3 | A1M | Potentiometer | | | | C2 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x4 | | U1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>