How to Make a Power Controller with Electronic Shower step by step. This device is also known as DIMMER. In this case it is a homemade Dimmer because I use the parts of a used electronic shower and with some modifications it is able to control the temperature of a resistor, the brightness of an incandescent lamp and the rotation of motors in general. The video is all detailed and at the end of the video I test the power controller by regulating the speed of a drill.