Velleman WSG105 MadLab Electronic Kit - Junior Theremin

These work well. I've made plenty of these, as I use them to build Rem Devices for paranormal investigating. I did run into one so far that constantly resets and after changing out the components and chips, it was the NE555 chip that was bad. Unfortunately it's already put together and can't get a refund...

I have bought about 7 of these kits. I like the packaging. The kits have helped me learn how to solder and what is needed to solder them correctly. They work well if you have good soldering technique. The musical notes are fun to play with.

I have purchased these in the past and they worked well.. the last 5 I bought.. only 1 of the 5 works. The new smaller boxed ones just beep and restart constantly.