As promised here are all of the files necessary to make your own oscilloscope. This device limits the output of the signal so that you can pass it to an app on your phone or tablet. I'm still doing a little bit of testing with the device itself, testing at what voltages it stops being safe. Basically, don't run this thing above 50 volts peak to peak. Remember that I take no responsibility for what this does to your phone or tablet if you misuse the device.