555 timer calculator.pdf
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7/24/13 555 Timer Calculator
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555 Timer CircuitsHOME | LEARNING | CIRCUITS | FORUM
555 Timers are fun and a great way to start learning electronics
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This page is very useful when creating 555 timer circuits. it will allow you to calculate the frequency and duty cycle.
Astable 555 Square Wave Calculator
In an astable circuit, the output continually switches state between high and low without any intervention from the
user. The duration of the high and low states are based on what values you choose for R1, R2 and C1.
The formulas used are:
Time High (secs) = 0.693 * (R1 + R2) * C1
Time Low (secs) = 0.693 * R2 * C1
Frequency = 1.44 / ((R1 + R2 + R2) * C1)
Duty Cycle Percentage = (Th / (Th + Tl)) * 100
Resistor (R1) Ohms
Resistor (R2) Ohms
Capacitor (C1) Farads
Calculate
Enter R1, R2 and C1, then press Calculate
Monostable 555 Timeout Calculator
This calculator is designed to give the timeout value (D) for a Monostable 555 Timer Circuit. When power is applied
to a monostable circuit the output is low until the delay time has elapsed, the output then goes high and remains
high.
The formula used is:
Time Out Delay (secs) = 1.1 * R1 * C1
To use this calculator simply enter values for R1 and C1, then press Calculate.
Resistor (R1) Ohms
555 Timer Calculator
7/24/13 555 Timer Calculator
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Next Page:
Common Mistakes
Capacitor (C1) Farads
Calculate
Enter R1 and C1, then press Calculate
Prev Page:
Using the Output of a 555 Timer
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