Send him $30, and he'll send you a printed circuit board for a tiny battery powered monophonic synth. Details
Spend some time at a fantastically geeky site like All Electronics or Maplin buying the other components. The whole thing should cost $30-$60. Apparently pots are the expensive bit. Don't get distracted
Find a case. This is the fun bit, judging from the gallery
No seriously, can you add a real keyboard to one of these things?
I already use a Microkorg synth, so I don't need any extra noisemakers. I'm just curious to see if I can build my own simple monosynth, with maybe a 12 key scale (to hit all twelve notes in an octave).
Would this be possible? The real hook for me is being able to build my own casing for it. But if it's just going to be another "twist knobs and make sounds" thing, I don't know if it's worth the time.