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.
Step 1: Main components of project
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.
Step 2: Make the megaphone
Cut the end off of a large plastic soda bottle for the megaphone (as shown). I used a razor knife to start the cut, and then switched to household scissors. I used the old trick of cutting outside the line, then go back and re-cut to the line to get a smoother edge. I was planning on leaving the label on for a cutting guide, but I ripped it off too soon. So I used blue tape as a guide to follow.
Step 3: Spring mounting clips and spring assembly
I used a small paper clip and wound it around a small pin punch in the middle.
Then I cut it into two useable pieces:
Upper spring clip to be use as the permanent mounting point for the spring
Lower spring bracket for the movable mounting point
I put a permanent crimp to the Upper spring clip and the Lower spring bracket to each end of the spring (did this for all three springs). I am calling this the spring assembly.