NE555 Astable

              When a 555 timer is operating in Astable mode we obtain a pulse on the output pin whose ON time (Time high) and OFF time (Time low) can be controlled. This controlling can be done by selecting the appropriate values for the Resistor R1,R2 and capacitor C1. The circuit diagram to operate the 555 IC in Astable mode is shown be schema above.

Enter the data:

Impuls :
Time Impuls :

Impuls in secunds

Frenqurency :

Pulses per second

Duty Cycle :



Capasitor C1:

Calculation Result:

Period Time:
Time HIGH:
Time LOW:
Resistor Ra:
Resistor Rb:
Capacitor C2: