The oscilloscope is an expensive device, It displays the change of an electrical signal over time, with voltage and time as the Y- and X-axes, respectively, on a calibrated scale. The waveform can then be analyzed for properties such as amplitude, frequency, rise time, time interval, distortion, and others. However, not everyone has enough money to buy it. Today, I will build an oscilloscope from my samsung android phone. I use 2 resistors 1K and 10K to form a 10: 1 voltage divider circuit. It helps the phone measure about 20V. With a maximum frequency 20Khz. Be careful, High voltage can damage your phone. I will not be responsible for any damage.

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All my projects are free, I design them on EAGLE 6.0. I uploaded it to Google drive. You need to use a web browser to download the file and open the file with winrar software (extract) on the PC. Open schematic file (.SCH) and PCB file (.BRD) with EAGLE software.
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#Inverter
#12Vto220V
#oscilloscope