Animating sine wave in an oscilloscope

Create two lines using line tool.

Create more lines using line shape tool.Type some numbers as shown.

Create a wave shape using pen tool or create some 'zigzag' line using brush tool.

Create a rectangular selection using rectangular marquee tool. Press Shift+Ctrl+I to invert selection.

Click on the layer mask thumbnail from the bottom of the layer palette.

Unlink the mask by clicking over the chain icon between layer content and layer mask thumbnail from the layer.

Create a circle using elliptical shape tool.