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| A-1531 or A-557 | | Knobs | | | | U2 | 1 | TL074 | Quad operational amplifier, DIP-14"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | | C4, C5 | 2 | 1N5817 | Schottky Barrier Rectifier Diode, DO-41 Small Signal NPN Transistor, TO-92 | | | C7, C12, C13 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92

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