TIMING CALCULATORS FOR LM555

Resistor values are in Ohms (1K = 1000) - Capacitor values are in Microfarads (1uF = 1)

  NOTE: The leakage currents of electrolytic capacitors will affect the actual output results of the timers. To compensate for leakage it is often better to use a higher value capacitor and lower value resistors in the timer circuits.

LM555 Monostable Oscillator Circuit Diagram