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 ...

From time to time I get requests to make some high power switching ... ac light dimmer module with zero-crossing detector described here is ideal for microcontroller-based ac voltage controlling ...

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 ...

On that board he found a variable resistor combined with a capacitor which control a triac, actuating the speed of a drill. [Ben’s] solution works great and isolates the drill from the control ...

Power relays are specifically designed to handle either AC or DC. It’s important to know the fundamental differences between them before building them into a system. Introduction to AC and DC ...

The FL7730 circuit is an active PFC controller for single-stage flyback topology application. The device supports both triac and analog dimming. The device can achieve triac dimming control ...