Kamal Mostafa kamal@whence.com

DC coupled soundcard DAC mod

Common soundcard outputs are AC coupled. I needed DC coupled outputs for my homebrew laser projector, so I hacked a USB soundcard by bridging the coupling caps with 100 ohm resistors. Simple mod -- works great!


Cheap 6-channel USB soundcard ($11 USD from eBay):

Before and after placing 100 ohm resistors on four of the six output channels: