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"Does it replace the two stacked resistors with the "out" from the 555 in the middle?" Yes, this schematic is from LTspice. LTspice does not have a good Potentiometer simulation (at least I could not find one). So the 2 resistors (R2 and R3) are my way to simulate a Pot. In simulation, I would change ratio R2/R3 to for example: 1K/9K to simulate that point of the POT position. Than set them to 9K/1K to simulate another point in the POT. Than I would run LTspice and see the width of the pulse coming out of the 555 circuit.
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Tri-LED Color MixerView Instructable »