555 timer calculator

Timing follows the standard bipolar-555 equations: the astable charges through R1+R2 and discharges through R2 alone, so its duty cycle always sits above 50%, and the monostable pulse is 1.1 times R times C. Findings flag the component choices that tend not to work in real hardware: discharge resistance under 1 kΩ, timing resistance past 10 MΩ, capacitors under 500 pF or deep into electrolytic territory, frequencies past a bipolar NE555, and monostable pulses under 10 µs.