Can a cheap LCD digital oscilloscope be setup to analyze frequency? Or is that the whole purpose of spectrum analyzer? I just want to teach myself how to make high/low cut-off (or WHATEVER) audio filters, and measure them on the screen.
I just learned how to view square pulse & pwm signals, and can see the line jump from ground, +5v, +12v. When I bought the scope, I thought I was going to be able to see audio waves through it, and see how a store bought equalizer changes the signal on the screen, so I can learn how to copy those circuits for myself.
I suppose I could just run a pre-amplified audio signal straight into my line-in jack on the computer, and use software - but if these tests can be done on my scope, I would like to learn how.