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
15 years ago