DIY ARM synthesizer
Matt built a 4-oscillator digital oscillator running on an ARM Cortex-M0 . And it's awesome!
Posts
Amazing time-lapse of the building of a modular
This guy built his own modular and filmed it all with a time-lapse app for the iPhone. The synthesizer can be also heard on the soundtrack. Amazing work!
Mixtape Alpha
The Mixtape Alpha is a $42 synth / sequencer smaller than a cassette tape. It is limited to chiptune style sounds, but is still very cool and very portable - you can easily take it anywhere with you. The schematics and source code are available to download, which makes it possible to even build your own.
DIY telephone handset microphone
This guy made a microphone out of a telephone handset and made an instructable out of it . He used quite simple electronics and the sound quality is not very good, as you can hear in the demo video he posted . Anyway, it's a nice idea and gives some use for the old wired telephones. See also this cool video of a studio performance with two DIY headset mics! Erikino & James Studio Perforance