It’s probably fine for other jobs though. It was also a complete waste of money, because it has only one input channel. El-cheapo dongleĪt about £1 this was the cheapest device. I made some more extensive notes 3 elsewhere. ![]() I tried a three different sound cards, and perhaps unsurprisingly found that cost mattered. Proceed at your own risk! Cheap USB sound interfaces Instead, I tried some cheap USB sound interfaces: happily these worked tolerably well.Īlthough using an external sound interface connected by USB reduces the risk of destroying the computer, it doesn’t completely protect it. for most applications you’ll need some sort of input protection or processing.Ĭomputers are expensive, and so I was wary of using the internal sound hardware.most sound cards will inly digitize signals in the 20Hz-20kHz audio band.to get two input channels, we will need a stereo input.2Įven if this works, it is important to realize: ![]() It is worth saying that this is not a new idea: just ask Google, 1 or follow this Instructable. So it’s natural to ask if we could use that instead. However, many people do have a dual channel analogue input device for their computer in the form of a sound interface. Although the natural way to plot two signals against each other is with a dual-channel oscilloscope, regrettably not everyone has such an animal.
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