555 Timer Calculator

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Calculating time

Calculating resistors

Value of resistor R1 (kΩ):

Value of resistor R2 (kΩ):

The high time T1 (msec):

The low time T2 (msec):

Capacity of C1 (mcF):

Standard Resistor Values:

E6

E12

E24

E48

E96

Wiring Diagram

Schematic

Save calculation on the picture

4 bands resistor

The calculation is for NE555 working in an astable mode