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| S3 | 1 | 10nF | Unpolarized capacitor | | J6 | 1 | TL071 | Operational amplifier, DIP-8 | | | | | J2 | 1 | 100k | Resistor | | | U3 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x10 | | | | | R4, R6, R7, R30, R31 | 1 .

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