A basic of control volume
Electronic

In this project, you are going to learn how the control volume works.

After wiring the project, rotate the control volume to the right end and turn power ON. It makes the LED 1 go out.

Then, as you turn the control volume to the left slowly, the brightness of LED 1 changes from dimmed to its brightest. It reaches the brightest when you turn the control volume to the left end.

The control volume has 3 terminals. In this circuit, the voltage of its mid terminal varies from 0V to 9V when the control volume is turned. By turning the control volume, we can change the brightness of LED, amount of sound volume, etc.