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Build notes) 1 SIP socket, 2.54 mm, 1x10 Pin socket, 2.54 mm, 1x4 Light emitting diode, 5 mm Small Signal NPN Transistor, TO-92 | | | R30 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | J8 | 1 | TL071 | Operational amplifier, DIP-8 | | | R23, R24, R25, R27.

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