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J9 | 3 | 4.7k | Resistor | | | | Tayda | A-157 | | | | | | Tayda | A-4755 | | | | | | | J2 | 1 | LED | Light emitting diode, 5 mm Small Signal NPN Transistor, TO-92 | | | R15, R20, R22 | 2 | 1nF | Film capacitor | | Tayda | A-3186 | | | | S2 | 1 | TL071 | Operational amplifier, DIP-8 | | | | | | R16, R18, R26 | 3 | A1M | Potentiometer | | | Tayda .

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