Headphone amplifiers are standard equipment for the average music loving audiophile. The problem with this is that most quality headphone amplifiers capable of delivering enough juice to power your big bad Cans can become costly. So then comes along some genius named Chu Moy ( www.headwize.com ). Chu created a monster quite some time ago by openly publishing his schematic and circuit diagrams for what became known as the "cMoy" amp. These cMoys spread like fire through the audiophile and audio-tweaker community and with good reason. Chu's creation is based on a simple OP AMP (operational amplifier, the actual chip that drives our creation), they need few other components (a few resistors, switches, pots and caps) and they run happily for a long time on a single 9V battery, not to mention that, assuming its put together correctly, they sound incredible.
Ah yes, the mad headphone science of Mr. Chu Moy.