From the MAKE Flickr pool:
Ranjit created this tiny synthesizer for the thing-a-day project. Though only about two inches long, this noisemaker has five sliding switches to augment tone and a pitch control on top. Unfortunately, no schematic was made available – but one book was cited as a source:

handmade_electronic_music.jpg

Handmade Electronic Music takes a loose and playful approach to the subject of electronic sound. This book bypasses many complexities of electronic theory in favor of inexpensive experimentation and discovery akin to circuit bending with a high-art leaning – Great for getting your feet wet, though it will leave the newcomer with many unanswered questions.

Matchbox Synthesizer on Vimeo –Link

Matchbox Synthesizer on Flickr –Link

Handmade Electronic Music: The Art of Hardware Hacking –Link

Related:
Handmade Music Night
MAKE NYC & Handmade music night! JAM PACKED!! –Link

TV-to-synth_interface.jpg
TV-to-synth interface in MAKE Vol. 8 page 123 –Link