A couple of months ago I purchased the book Analog Synthesizers by Ray Wilson. I was intrigued by the book and quickly decided to build the beginners kit of a DIY Analog Synthesizer presented in the book, the Noise Toaster.
I already had a plastic enclosure and a bunch of components, so I decided to order just the PCB from Ray Wilson, and not the whole kit. Ray Wilson is sort of a DIY analog synth guru and runs the web page http://www.musicfromouterspace.com/. The web page consist of all the information you need to build the Noise Toaster. However, I highly recommend to buy the book. It is well written, and I think the guy deserves some extra dollars for running his highly informative web-page.
The Noise Toaster consists of about 150 components, and is a fairly easy build. The only thing i forgot while ordering parts was that the design uses a lot of E24 resistors (which I did not have) and some bipolar capacitors (which are hard to get). Besides that, the components are fairly standard.
The only problem I had after the assembly was that the white noise generator did not work at all. I traced it down to the 2n3904 transistor Q5 which was not actually generating noise. I recommend to breadboard the white noise generator to make sure you select a 2n3904 which generates sufficient white noise. Two of the transistors I tried did not actually work as white noise generators. After soldering up the PCB and mounting the switches and pots, I fired it up and enjoyed the nice sound of the synth with all its squeals and noises.
The Noise Toaster runs of a 9V battery, which must be mounted securely inside the box. I downloaded a design for a 9V battery holder from Thingiverse, printed it on my 3D-printer and "glued" it to the bottom plate with sugru. For the speaker, I drilled a 50mm hole and mounted the speaker (again with sugru).
Since my plastic enclosure was way smaller that the design presented in the book, I had to design my own front panel. I did this in gimp based on Wilsons design. As I do not have a laminating machine, I printed the front panel on a 20x15cm photo paper and cut it to its proper size. It is not scratch-safe, but seems to work just fine.
The next step is to build some additional synth boxes to accompany the toaster. Together they will rule the world of noisy analog music.