Function or Signal Generator
This is a short video on the building of a Function/Signal Generator based on the XR2206 IC. It was pretty easy and only took an hour to complete. In fact the case was the hardest thing to put together as the screws were all the wrong length and they did not include enough nuts.
I got mine from the eBay seller alice1101983, but you can get them from other sellers too, and maybe cheaper!
Link to the kit
https://ebay.us/s1w5qV via @eBay_UK