I reacently finished my cmoy, made my own pcb according to the http://williamneo.blogspot.com/2008/01/diy-cmoy-headphone-amplifier-for.html, and after testing it I discovered that it works fine for two or three seconds,and then starts to distort, and when i turn it of an on, it improves to be good,but sometimes it it works fine for whole 5 minutes and then go bad.Also by extracting my 3.5mm jack(out) to the half it stop with distortion. What can be cause of distortion?
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