555 Astable

555555%

The amount of time that the signal is at 0v (Time Low), is calculated by the following equation:

TL

 

 

The amount of time that the signal is approximately 5v (Time High), is calculated by the following equation:

TH

 

 

The total period is calculated either by adding together the time high with the time low, or by using this condensed equation:

T

 

 

Finally, the frequency can be calculated using this formula:

fffff

 

 

More information about 555 timers can be found here: ‘http://www.ti.com/lit/ds/symlink/ne555.pdf‘.

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