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Inverter, maybe for stability? 10-step mode is ~$16-20 in parts, two tl074 op amps and otherwise a bunch of wires backwards e6b834b08c Fix floating pin for Pause (J19/J18); the schematic is incorrect Ins: Clock In Normal - 1k to U2-8 (AND NOT short to U2-10 - Clock rate goes down when resistance goes up, opposite to expectation. C1 is too small; need more than fifty percent (50%) or more.

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