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BackAt least it is the decade counter with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74655095.pdf REDCUBE THR with internal clock rate. One potentiometer per step, to set output voltages. (10) One potentiometer for internal clock rate. One potentiometer per step, to set output voltages. (10) One potentiometer per step, to set output voltages. (10) One potentiometer per step, to set output voltages. (10 One SPDT switch per step, to set output voltages. (10 One multi-pole rotary switch - 9.5mm, +5mm extra space micro toggle switch ON-ON SPDT miniature toggle switch ON-ON | | | | | | R3, R21 | 2 | 10k | Resistor | | | C3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | R4, R6, R7, R30, R31 Switch, dual pole double throw K switch normally-open pushbutton push-button Lamp D Push button switch, normally closed, generic, four pins D Momentary Switch, dual pole double throw, separate symbols