Cell Phone Oscilloscope. Do it yourself, easy and cheap. DIY

In this video we are going to make an oscilloscope on the cell phone.
A very simple project with few components but with a very nice result.
Of course, we will not have equipment with great precision, but as an experience and even for some simpler waves, it is very interesting.
You can use up to 12V and some Khz. At the beginning of the video, I'm using a 12V transformer.
ATTENTION: This is an easy project that is worth doing. The only care is not to make mistakes and not to use above the defined voltage 12V. Otherwise, you may damage your phone.
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