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BackFile Schematics/Unseen Servant/Unseen Servant.kicad_prl | 4 Fireball/Fireball.kicad_sch | 4 | 100 nF | Unpolarized capacitor | | | S2 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x7 | | C7, C12 | 2 | 47k | Resistor | | Screws and spacers (see [build notes](build.md | | | 1 | TL071 | Operational amplifier, DIP-8 | | | | U1 | 1 uF tantalum\nYuSynth 1, 10 µF tanty looks better than EL\n(higher output, less leakage)\nbut only by a little. 1 µF \npolyester film looks much \nbetter. Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14