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40 .../Unseen Servant/Unseen Servant.kicad_pcb | 2 | 10k | Resistor | | | | | | | R4, R12, R13 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | Screws and spacers (see [build notes](build.md)) | | | R16, R17, R19, R20 **Potentiometer, 9 mm vertical board mount OR: | | | | S2 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | R109, R111, R113 | 3 | 1k | Resistor | | | | Tayda | A-2939 | | Tayda | A-2939 | | J2 | 1 | Synth_power_2x5 | 2x5 pin shrouded header 2.54 mm spacing KK254 Molex header Schottky Barrier Rectifier Diode, DO-41 D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | Standard switching diode, DO-35 | | | | | Taydaa | A-4755 | | | | | | | | | | | | S1 | 1 | 1 | TL071 | Operational amplifier, DIP-8 | | Tayda | A-159 | | R5, R29 | 3 | 22k | Resistor | | | | | R25, R27, R29 | 2 | 4.7k | Resistor | | R1.

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