Info

Fill in one of the values below and press ‘Calc’ and the calculator will give you a range of options for R1, R2 & C1.

ne555Timer

How often do you want the timer to fire?  Seconds   
Calc
What frequency do you want the timer to fire at?  Hertz   
Calc
 

Thanks to House of Jeff

Click on the icon/row to see resistors color value.