Trailing Edge Dimmer Schematic. In this project we will have a closer look at the electrical challenges ac led light bulbs offer when it comes to dimming them. Zero crossing detection unit.
The dimmer complies with the australian standards. Then the power device switches off at some point in the half cycle creating a trailing edge waveform. U2 is an optocoupler 4n35 and its led is powered via r6 and r7 and then from the bridge rectifier.
Although a 400w trailing edge dimmer may be able to power 400w of incandescent lamps with ease when it comes to leds the maximum load is only 10 of this.
In this project we will have a closer look at the electrical challenges ac led light bulbs offer when it comes to dimming them. Diy trailing edge dimmer. The unit is suitable for both domestic and commercial applications and is rated at 800w 3 3a. U2 is an optocoupler 4n35 and its led is powered via r6 and r7 and then from the bridge rectifier.
