I made it at Techshop. http://www.techshop.ws/
It is cricket season and even thought I like the sound of crickets; I do not like crickets in my garage or barn. I wanted a non lethal way of removing the crickets. My idea is to capture a chirping cricket and place it in the cage with some food. Take it out away from the home and point it back towards the home. The cricket sound is amplified by the megaphone. I hope to draw the crickets to the louder sound. Call of the wild.
Main components of project: Large plastic soda bottle, house hold window screen, metal pencil holder and metal paper clip holder (from local dollar store). Not shown is 3 springs, 3 paper clips.