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| R20, R22 | 3 | A1M | Potentiometer | | | | | | J9 | 1 | TL071 | Operational amplifier, DIP-8 | | | U3 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x7 | | R25 | 1 | 1 nF .

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