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| *(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | J7, J8, J9 | 3 | 22k | Resistor | | | Tayda | A-1157 or A-2425 | | | U2 | 1 | 3_pin_Molex_header | 3 | 1k | Resistor | | Q1, Q2, Q3, Q4, Q5 R1, R2, R23.

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