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R23, R24, R25, R27 Switch, triple pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS) | | | | | | | | U1 | 1 | 1uF | Unpolarized capacitor | | J2 | 1 | B20k | Potentiometer | | | | Tayda | A-826 | | | | S1 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x7 | | J3, J4, J5 | 3 | 4.7k | Resistor | | | C10 | 1 | LED | Light emitting diode | Tayda | A-1157 or A-2425 | | R14, R15, R18 | 3 | A1M | **Potentiometer, 16 mm pots had long enough terminals, barely, to poke through the power safety block and into any non-high-impedence connections; that is, fat traces to chip power, but not to front panel and Pin 1, horizontal PCB.

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