Frequency problem:

Mar 30, 2007 3 Replies

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MacRae 19 years ago

I've got an op-amp which subjects two seperate signals simultaneously. The unfortunate thing is that both signals have similar frequency bands so a simple band-pass circuit will not suffice in seperating them after the amplification.

I've built a simple oscillator with the hope of "adding" this constant(ish) frequency, to the frequency of one of the original signals, thereby providing enough difference in the frequency spectrum for me to run a band-pass filter after the op-amp process.

So how can i "Add" one frequency to the other? does this even make sense?

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TimPerry 19 years ago

clarification is needed as to what kind of signals you have and what you want to do with them.

are they audio frequency or RF? sine waves, square or other?

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Salmon Egg 19 years ago

I hope that English is not your first language because your question is very confusing. However, I am willing to admit that your English is better than any second language of mine.

To the extent that I understand what you want, there are many ways to shift frequency. In essence, you want a single side-band modulator.

Bill

-- Fermez le Bush--about two years to go.

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daestrom 19 years ago

I *think* what your asking is how do you frequency modulate the 'fixed' frequency signal. If the 'fixed' signal's frequency is high enough compared to the varying one, look up 'FM' circuits in any text or on-line.

daestrom

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