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?