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NE555 Astable Oscillator

To calculate the frequency use the formula

FHz = 1/(0.693 x (R1+(2 x R2)) x C)

 

To calculate the on time use the formula:

Tsec = 0.693 x (R1+R2) x C

 

To calculate the off time use the formula:

Tsec = 0.693 x R2 x C

 

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