![]() The above 555 timer Astable calculator can be used to calculate these values, but to understand its working we need to know the following formulas based on which the calculator works. As said earlier how long the pulse stays high, how long the pulse stays low and the frequency of the pulse can be calculated using the value of components R1,R2 and C1 shown on the circuit diagram above. The time axis T is measured in seconds and the Voltage axis is measured in Volts. ![]() The output wave obtained from pin 3 is shown with markings below This method can be used to generate clock pulses for Microcontrollers/Digital IC’s or blink an LED or any other applications where specific time intervals are needed. The above circuit can be used to produce a square wave in which the high time (T1) and low time (T2) can be calculated. The circuit diagram to operate the 555 IC in Astable mode is shown be This controlling can be done by selecting the appropriate values for the Resistor R1,R2 and capacitor C1. 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. ![]() Here the time period is the total time it takes to complete one on/off cycle (T 1+T 2), while Duty cycle is the percentage of total time for which the output is HIGH. In this 555 timer Astable calculator, enter the values of timing capacitor C and timing resistors R1 & R2 to calculate the frequency, period and duty cycle.
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