I'm trying out a few different mechanisms for my bird box project.
Rather than experimenting with several designs and then just posting one as a download I thought you might be interested to try out the various designs yourself and join in the fun!
Here's the second layout of a two pipe twitterer. The volume of the bellows is much greater than the previous version so the sound is much clearer. I'll be releasing this one and the previous double bellows project as downloadable kits in the next few days.