Calculate 555 astable/monostable timing and RC low/high-pass filter cutoff frequencies with response plots
Astable mode uses f = 1.44 / ((R1 + 2·R2)·C) with duty cycle set by R1 and R2; monostable pulse width is T = 1.1·R1·C; and the RC filter cutoff is fc = 1/(2πRC). Handy for electronics labs, breadboard projects, and quick sanity checks when designing oscillators, debounce circuits, and signal filters.
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