a while back, i built built a project that made nice listenable sine waves by outputting a pwm signal at about 15KHz through a low pass filter. it works. i can tell it works, because i can hear a melody coming out of it even though all i’m doing is generating a string of pulses at a fixed frequency. i just can’t believe it works. wanted to see it.
got me a nano dso. sure enough, i hook it up ahead of the filter nothing but 15KHz jaggies, but i hook it up after the filter and nothing but smooth siney goodness. couldn’t be more impressed with myself, but i know there’s noise in there. i’m getting a little old and some days i can hear it and some days i can’t, but i’d like to be able to see it. trouble is that when i scale the voltage per division my signal wanders off the top of the display.
any way i can move that axis?
and thanks for a really sweet toy, er, tool.