Simple AVR-based MIDI monophonic synthesizer.

This analyzer displays an audio wave form in real-time like a digital oscilloscope and a FFT spectrum analysis.

An evolution of the homebrew MP3 player - if you are interested in building your own, here is all you need.

A Microchip PIC based USB sound card

Unlike old-school mechanical alarm clocks that you have to set manually, this Internet-connected alarm clock provides three primary features: automatic time setting on power-up, streaming MP3 music, and remote management.

A monophonic synthesizer based on an Atmel AVR microcontroller.

For around $30 in parts and a good amount of patience, you can have a completely open source and hackable mp3 player ready to go. It can be modified to accept serial commands, be embedded in an art project, used as the voice of your next smart talking robo-sidekick, or filled with music and used as is. Put in whatever size card you want, up to the theoretical limit of the MMC format.

Using a pwm channel of a simple microcontroller, a capacitor and a resistor to reproducting sounds.

A sampler is a device that can record and store audio signals adding effects like time stretching, distorsion, phaser, changes in pitch, etc.

An USB soundcard for PC based on Microchip PIC18F2550.