![]() I suspect you'll be better off trying to pick up an old/used scope for cheap. I think there's a reason why oscilloscopes are usually dedicated hardware. Then if it gets too fast (into the megahertz), you start to have the issue of whether the CPU can read and process the samples that quickly. ![]() So any other approach would have to sample much faster. 48 KHz isn't fast enough to see a lot of the signals you might want to see, especially in electronics. I suspect the main issue with the sound card is the low sampling rate. So this wouldn't really be useful for sampling variable voltages. Do the game ports really have true A/D converters? I seem to recall reading that since the joystick input is just a variable resistance, that the game port just puts a capacitor in series with that resistance and times how long the capacitor takes to charge to some predefined level.
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