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C4, C5 | 3 | 22k | Resistor | | | | Tayda | A-1157 or A-2425 | | | | | | C7, C12 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x4 | | | U1 | 1 | ICM7555xP | CMOS General.

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