pcorbett

Piezoelectric discs are clever low tech gizmos that are everywhere and are super cheap if you choose to buy them from cigar box guitar parts vender. They also can be cut in half or you can trim them and with a small collection you can experiment freely and cheaply. To repeat the list : anything used as an alarm such as clocks, fire alarms, and timers (microwave oven) it's also used as a sensors to stop vacuum cleaner heads from overloading with sometimes two large ones . I found good ones in the rain sensors of a (Velux ) skylight used as a rain sensor but rare to retrieve due to the skylights are not old enough yet for replacement. In a nut shell its speakers, microphones, and vibration detectors. Nice work Ham...

Is this sad or what?

Just made one it a couple of minutes. Well how slick is this.........works well. So easy to do I did it by eye and all free hand with just sharp scissors. Thanks for the instruct, well done.

Fantastic.

A "Reverse" trike is called a Delta. IMMHO. This is a sweet Tadpole morphed with a Hammer Head Trike. I like what has happened here. Here is a picture of my Hammer Head Trike.

You have a great Instructable, I don't know how I missed it when you first posted it. You have made an improvement on a very simple and inexpensive instrument. Well done.