A common theme in modern consumer electronics is having a power button that can be tapped to turn the device on, but needs to be held down when it’s time to shut it off. [R. Jayapal] had noticed ...

In this circuit, mains AC is fed to output terminal through the U5 triac. It should be selected according to ... Thus, the flip-flop output goes LOW, switching Q2 OFF. At this point, no current flows ...

[brmarcum] feel’s your pain. He’s developed his own motion activated AC switching circuit to turn the lights on and off automatically. A motion sensor ensures that the lights are only on when ...

In some cases the LED lamp has been taken out of its box and installed in a room with a dimmer switch only to discover ... during the portion of the AC line half cycle before the triac fires. The ...

They also are getting additional interest as part of Internet- and cell-phone-controlled power-line switches such as the Belkin WeMo Home Automation Switch ... triac, the popular dimmer circuit ...

Because they draw relatively little current from the ac line, they are fundamentally incompatible with triac-based dimmers.) The triac is the switching element in the accompanying dimmer circuit.