We know that astable multivibrator is simply an oscillator circuit that produces continuous pulses without the help of any external triggering. The oscillation frequency and time period can be manually controlled through simple modification of resistors and capacitors i.e. by changing the values of R1, R2 and C1. You can use a

**555 timer astable calculator**tool to make your designing easier.## Astable 555 calculator for calculating Frequency and Time period

We had already discussed the
We have also come up with a monostable frequency calculator tool. You can also have a look at that for monostable pulse duration calculation.

**555 timer tutorial**of**astable multivibrator**in detail with**animation**. Though we provided the design equation there, one of our reader Mr Dewanto asked:*"I need Ton=3 seconds, and Toff= 15 minutes. how can I modify the capacitor then?*"So we thought about creating an astable 555 timer calculator. With this 555 timer IC astable calculator you can calculate frequency, duty cycle (in percent), high and low output time periods to meet your requirements.## Reference circuit diagram of astable multivibrator using 555 timer

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Thanks for this great tool. It makes designing easier

Thanks for the feedback. Visit again to see more designing tools.

it was a tough problem for me to calculate the frequency and duty cycle. This is really useful.

Hi Yousuf

Happy to know that it was helpful to you.

wow, so many thank you for the best response… it is very fruitful…

Hi Dewanto,

It's our pleasure to help our fellow electronics lovers. People like you make our website live.

Hi Admin,

could you please to specify what you mean VCC (voltage) 9V or 12V ?

thanks.

Hi Panji,

You can use +12V as VCC.