This calculator is designed to determine the resonant frequency of a given LC circuit. An LC circuit is primarily a configuration involving an inductor and a capacitor.

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Your Comments are too Valuable! But please see that they are related to the above article, and are not off-topic!

I am curious as to the resonant frequencies of a 120/100 volt power supply rectified to DC then using an CLC filter. is a resonant frequency of 4.238 a good frequency to have as i am trying to attain a very flat dc output at under 2 amps. L is a laminated silicon iron core 6″ L x 2.25 W x .75 H @ ruffly 300 to 500 mh. Thank you in advance.

Hello Swagadam Please help, I want to make my Inductor to be installed on my generator (my output is square wave at Ic555, i need a formula Of how to compute the henry in order to achieved Sine Wave.

Hello Romeo, I have not yet investigated inductor filters so I do not have the formulas with me right now, but I think you can use RC networks instead for the same results.

Hi Swagatam, Thank you for promt reply This application for a 12-0-12/240 AC volts transformer. Can you send me diagram of RC networks for ic555 or 4017 Supply volts 12 to 15 volts for ic555 output pin 3 im using 2n3055 and 2n2222. Thank you very much. Romeo

Hi Romeo, you can try the following RC filter circuit for converting square wave into sine wavform. But please remember that the RC values will need to be adjusted as per the input frequency:

Can you please tell what exactly are you trying to make, is it an inverter? If it’s an inverter then this concept will not work. I provided this for converting your IC 555 square wave into sine wave!

ROMEO JR. G DITCHONsays

Hi Swagatam, Yes it is inverter and i used ic555 and a transformer 12-0-12/230 vac Thanks Romeo

Swagatamsays

I am sorry Romeo, a sine wave input cannot be used from the DC side for an inverter…you will have to use an SPWM at the DC side and then refine the output on the AC side with LC filter or simply with capacitors.

mohasays

Hi swagadam,

i am moha, i really appriciated to you doing very good guidence upcoming engineers inspriation.

i need some information about transformers core max saturated frequency like Iron core, ferite core pls reply and thankful to you

I am not sure about the exact frequency range for these variants, but it seems 20 to 200 Hz is suitable for iron core coils and 10kHz to 100kHz for ferrite based coils.

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Donald Livesay says

PS. caps size is 4700 mf for power supply.

Donald Livesay says

I am curious as to the resonant frequencies of a 120/100 volt power supply rectified to DC then using an CLC filter. is a resonant frequency of 4.238 a good frequency to have as i am trying to attain a very flat dc output at under 2 amps. L is a laminated silicon iron core 6″ L x 2.25 W x .75 H @ ruffly 300 to 500 mh.

Thank you in advance.

Swagatam says

Please use the above software to calculate it…

Romeo says

Hello Swagadam

Please help, I want to make my Inductor to be installed on my generator (my output is square wave at Ic555, i need a formula

Of how to compute the henry in order to achieved Sine Wave.

Thank you

Romeo

Swagatam says

Hello Romeo, I have not yet investigated inductor filters so I do not have the formulas with me right now, but I think you can use RC networks instead for the same results.

By the way for what application do you need this?

ROMEO JR. G DITCHON says

Hi Swagatam,

Thank you for promt reply

This application for a 12-0-12/240 AC volts transformer.

Can you send me diagram of RC networks for ic555 or 4017

Supply volts 12 to 15 volts for ic555 output pin 3 im using 2n3055 and 2n2222.

Thank you very much.

Romeo

Swagatam says

Hi Romeo, you can try the following RC filter circuit for converting square wave into sine wavform. But please remember that the RC values will need to be adjusted as per the input frequency:

https://www.homemade-circuits.com/wp-content/uploads/2019/04/square-wave-to-sinewave.jpg

ROMEO JR. G DITCHON says

Hi Swagatam,

Many Thanks

My frequency range would be 60hz/65 on 220/240 vac

Lastly is this diagram you uploads is for left and right output connection of 12-0-12 transformer.

Best Regards,

Romeo

Swagatam says

Hi Romeo,

Can you please tell what exactly are you trying to make, is it an inverter? If it’s an inverter then this concept will not work.

I provided this for converting your IC 555 square wave into sine wave!

ROMEO JR. G DITCHON says

Hi Swagatam,

Yes it is inverter and i used ic555 and a transformer 12-0-12/230 vac

Thanks

Romeo

Swagatam says

I am sorry Romeo, a sine wave input cannot be used from the DC side for an inverter…you will have to use an SPWM at the DC side and then refine the output on the AC side with LC filter or simply with capacitors.

moha says

Hi swagadam,

i am moha, i really appriciated to you doing very good guidence upcoming engineers inspriation.

i need some information about transformers core max saturated frequency like Iron core, ferite core

pls reply and thankful to you

Swag says

Thank you Moha,

I am not sure about the exact frequency range for these variants, but it seems 20 to 200 Hz is suitable for iron core coils and 10kHz to 100kHz for ferrite based coils.