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R3, R21, R27, R28 | 3 | A1M | Potentiometer | | | | | | | Q1, Q2, Q3, Q4, Q5 | 5 | 22k | Resistor | | Tayda | A-1121 | | | J10 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x4 | | J9 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x7 | | U2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible.

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