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555 Timer Free is a component calculator for 555 integrated circuit. Component value calculations for the 555 take into account the supply voltage, timer fabrication (CMOS or Bipolar), and, where appropriate, load currents. You can modify the resistor and capacitor values. There are 4 cycles you have access, there are 3 stable modes (duty cycle less than 50%, duty cycle equals 50% and duty cycle greater than 50%) and monostable mode.