7AUDIO

Want to get canned in the best possible way? Well you need a headphone amplifier to drive those expensive cans hard and clean. I used a Burr Brown OPA2134PA which is a low distortion dual opamp available for only $AU7! For about $20 to $30 in parts, you can really get canned with a DIY headphone amp! Cheap when you think I paid near $AU300 for Grado head phones.

CMoy Headphone Amplifier

Gio first brought the CMoy to my attention when I saw his portable CMoy mint tin headphone amp. Mine was never meant to be portable but would be the system I can turn to when the wife is home and doesn’t want to hear music. Grado makes a fine looking headphone amp in a mahogany box, the Grado RA1. I really liked the idea and look of a wooden enclosure and I wanted a timber boxed “quality” headphone amp. I call my headphone amp the GWado.

CMOY HEADPHONE AMPLIFIER

I generally followed the original CMoy plans. The input caps are locally available 0.47uF polypropylene caps (Mex/Tenta). The power supply caps are 330uF low ESR. 0.1 uF polyester/mylar (green) caps are used directly on the power pins of the chip.

CMoy Headphone Amplifier Schematic

Read more below!