This triac-based 220V AC motor speed controller circuit is designed for controlling the speed of small household motors like drill machines. The speed of the motor can be controlled by changing the ...

Non-insulated power supplies are often required when a power semiconductor, which has to be controlled using this supply, has its drive reference connected to the mains (line or neutral terminal).

Diacs and triacs often are used for line-voltage control. They also are getting additional interest as part of Internet- and cell-phone-controlled power-line switches such as the Belkin WeMo Home ...