Generate better Arduino audio output with dual-PWM
It's no secret you can generate tones and simple audio with pulse-width modulation, but it isn't the best. However using the methods described by the Open Music Labs, you can use two PWM outputs and some simple analogue circuitry to create reasonable audio output. This is accomplished with 16-bit audio by sending the high bit to one digital output and the low bit to another, then mixing them with external circuitry.
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The package includes a wide variety of parts, sensors and modules including: a servo motor, lights, buttons, switches, sound, sensors, breadboard, wires and more. Furthermore a Freetronics Eleven Arduino-compatible board is included to make this an extensive hobby experimenter, inventor and starter kit. However we don't leave you alone to figure it all out, included is a great project and instruction booklet, plus access to a supporting web page and software examples. In other words - this is everything you need to get started for a fun range of electronics and Arduino related projects!