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Clock rate. One potentiometer per step, to set output voltages. (10 One potentiometer for internal clock rate. Schematics/Unseen Servant/fp-info-cache | 1 | 2_pin_Molex_header | 2 | 47k | Resistor | | | | R20, R22 | 2 | 47k | Resistor | | | | | | | C3, C4, C10 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 | | | | R4, R12, R13 | 3 | A1M | Potentiometer | | | | J9 | 3 | A1M | **Potentiometer, 16 mm have been tested and there could be mechanical difficulties using 9 mm. See build notes. *** A-3488 looks similar but is normally closed rather than normally open and will not work. Ask me how I know this. And by "ask me.

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