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# NE555 Timer Astable Circuit Calculator

NE555 is often mentioned as 555, is a highly reliable electronic device. The 555 timer is capable of being used in astable and monostable circuits. NE555 is an integrated circuit, used in time controllers and clock generators, sometimes used for switching on and off of power supplies too. The NE555 timer astable circuit calculator fetches you the values of frequency, time high, time low and duty cycle based on the input values such as registor1, registor2, and capacitor.

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NE555 is often mentioned as 555, is a highly reliable electronic device. The 555 timer is capable of being used in astable and monostable circuits. NE555 is an integrated circuit, used in time controllers and clock generators, sometimes used for switching on and off of power supplies too. The NE555 timer astable circuit calculator fetches you the values of frequency, time high, time low and duty cycle based on the input values such as registor1, registor2, and capacitor.

#### Formula:

f = 1.44 / ((R1 + 2(R2)) × C) THigh = 0.693 × (R1 + R2) × C Tlow = 0.693 × R2 × C d = ( THigh / ( THigh + l )) × 100 Where, R1 = Resistor 1 R2 = Resistor 2 C = Capacitor d = Duty Cycle f = Frequency THigh = Time High Tlow = Time Low

### Example:

Find the frequency of NE555 timer astable circuit whose resistors are 30ohms and 20 ohms and the capacitor of 15 farads?

#### Solution:

F = 1.44 / ((30 +20 + 20) × 15)
F =0.0016 MHz