Design and production of projection room lighting synchronization converter circuit

The working principle of the application circuit of the device is shown in Figure 5. When showing slides, movies or videos, the indoor lights are often turned off. When the show is over, the lights must be turned on immediately. The LCE module can easily achieve this automatic conversion.

When the projection power switch S2 is closed, the AC relay J is immediately energized and attracted, and its normally closed contact j is disconnected, cutting off the power supply of the lighting lamp H, and H is in the off state. When the projection ends, the switch S2 is opened, at which time the relay J is released, and its contact j is reset and closed, and the lighting lamp H is powered on. S1 is the indoor power switch.