555 Timer Astable Circuit Calculator 555 Timer Astable Circuit Calculator 555 Timer Astable Circuit Calculator Resistor R1 (Ω) Resistor R2 (Ω) Capacitor C (F) Calculate The 555 timer in astable mode oscillates between high and low states continuously. This calculator computes the frequency, duty cycle, and output high and low times for given resistor and capacitor values in an astable 555 timer circuit. Example Calculation Given values: R1 = 10kΩ, R2 = 100kΩ, C = 10µF. Frequency = 0.693 / ((R1 + 2 * R2) * C) Duty Cycle = (R1 + R2) / (R1 + 2 * R2) * 100% Subscribe to Updates Get the latest creative news from SmartMag about art & design.