Thought I'd post a video of ds2 making 'bird' sounds on our electronic kit last week.
The kit is basically a load of electronic components on a base board. The idea is to link up wires between springs that come from the components. Each of the 'projects' in the accompanying book gives a list of the numbers of the terminals to connect, some background on the project (and suggestions for adapting it) and a circuit diagram. I've just googled it and found a modern equivalent of our 500 in 1 electonic kit (ours is quite old) on Amazon http://www.amazon.co.uk/500-Electronic-Project-Lab-Kit/dp/B000LR9E4A
£159.95 - yikes! I think I got ours for about 4 quid secondhand!