On a call indicator light Answered
I need to figure out a cost effective way to let people know I'm on a phone call. This solution needs to light an LED automatically when I am actively using the telephone. Is there a way for a simple circuit to sense when a phone line is in use and not cause any line interference? The circuit doesn't need to be powered through the phone line, it just needs to be able to sense that the line is in use.
I know how to solder and understand basic electronics concepts but am also very teachable. If someone can point me to a schematic I can build it.
There are ready made, but expensive, solutions for sale but the costs are restrictive. Any help is greatly appreciated.