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Need help about frequency modulating

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phys_han

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Hi everybody

I had a similar problem about overlapping two waves and flatulent has helped me. Thank you again flatulent.

And I have another problem in the same experiment. Now, we have to combine two or more waves (let's say only two for simplicity at the beginning) by frequency modulator. First wave changes about 13KHz to 20KHz lets say carrier wave. The second one comes from another circuit and about 500-1000 Hz (Let's assume an anolog sound wave) and both in sin form. Firstly we designed a generator circuit to first wave but it's not steady enough.

Now I want to design a circuit by using PICs to generate more steady waves and to be able to change frequency. Then the second wave will be overlapped by frequency modulation.

I need any ideas.
 

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