Hi,

I am looking for a switch that will activate when a light source in placed infront of it. I am guessing this is some sort of phototransistor. The light source would only be an LED. This is to make a lead that could sit on the front recording LED of a camcorder, then have an inline battery and an LED at the end. this is to give me a long lead so I am able to see the recording light whilst being a couple of meters from the camera.

Any help on this would be great.

Mark

 

You can use a photo transistor but make sure that it can detect the spectrum of the LED light.

Also, you can use an LDR to detect light or the absence of light.

 

Many thanks for the information

Mark