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The DS3502 gives firmware 128 steps across a 10 kΩ potentiometer, but the wiper remains an analog node with voltage, loading and startup-state limits.
DS3502 Digital Potentiometer: Treat the Wiper as an Analog Node Read More
A 555 one-shot follows t ≈ 1.1RC only when the trigger is clean and the timing parts behave as assumed. Calculate the nominal interval, then budget resistor and capacitor error.
555 Monostable Pulse Width: Calculate RC, Then Budget Component Tolerance Read More