Square to sine

249

03:20:36

This ckt uses three cascaded low pass filters to filter out higher frequencies and gets u a pure sine wave 
The opamps are just used to remove the loading effect 
Fourier transform of a periodic square wave is a series of sine waves of 1Wo, 3Wo, 5Wo ....
Wo=frequency of original square wave 
Hope this helps 😊

published 7 years ago

jpoulin0901

7 years ago

If you know the exact frequency you're trying to filter out, an RLC bandpass filer would be much more efficient. If you're going to use opamps, a twin t or wein bridge style filter would also be preferable and able to give you a much more nearly pure sinusoid. http://everycircuit.com/circuit/6305174368026624

zorgrian

7 years ago

This produced a nice triangle wave.....

mineswiss

7 years ago

who doesnt need a triangle wave between 0.4 and 0.6 volt

mineswiss

7 years ago

why try to filter a sine out of a square wave ending up in a triangle wave when you can just stimulate an LC resonator with a square wave

matt2496

7 years ago

http://everycircuit.com/circuit/4591403698225152

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