Fixing USB audio controller (CM108) for headphones
Cheap USB audio controller Recently, I bought a cheap USB audio controller because my motherboard's built-in microphone input was dead. However, there were some problems with the stereo output. It seems to work well when it was connected to a pair of powered speakers, but there was only noise when connected directly to my earphones. When I measured the output voltage, it shows a 2 - 4 V bias voltage which is unusual because it should not have any bias voltages and normally 0 V when no audio. When plugged into my Linux machine, lsusb shows the following: $ lsusb | grep -i audio Bus 005 Device 003: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller So, with a little googling for CM108, I found that the datasheet at http://www.halicky.sk/om3cph/sb/CM108_DataSheet_v1.6.pdf and also Kevin Custer's site about modifying it http://www.repeater-builder.com/projects/fob/startech-fob.html When I opened up the device and compare it with Kevin Custer's photos,...