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Many places might be fine, might introduce intermittents - Don't put R8 so close to R26 -- D36/R47 too close Testing before powering up: Clock In Normal - 1k to U2-8 (AND NOT short to U2-10 - Clock In Normal - 1k to U2-8 (AND NOT short to U2-10 Clock Rate - variable resist +6k between U2-8 and U2-9 Reset Sw - when two traces cross on opposite sides of the shaft hole.