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R20, R22 | 3 | 4.7k | Resistor | | | J3 | 1 | 10nF | Ceramic capacitor | | | Tayda | A-559 | | J5, J12, J13 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/> Operational amplifier, DIP-8 Standard switching diode, DO-35"/>

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