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555 Timer Calculator

Frequency, duty cycle and pulse length for 555 astable and monostable circuits

Circuit

Type values like 4.7k, 4k7, 100n or 2M2.

Ω
Ω
Ω
F

Display

Frequency

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Period

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High Time

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Low Time

–
 

Duty Cycle

–
 

Nearest Standard C

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Waveform

All measurements

MeasureValueHow it is worked out