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Behringer UMC204 Headphone Gain mod

Lambda

Major Contributor
Joined
Mar 22, 2020
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For so reason the this interface is designed in a way has way more Analog gain than it can Handel
Since everything is powered from 5V with a 2,5V virtual ground it can relay only output about 1Vrms
1Vrms corresponds the volume potentiometer at 12 o'clock. everything over this will result in clipping.

I don’t like this so i changed it:
1637800176902.png

photo5258311890965215202.jpg


To:
photo5258311890965215201.jpg

1637800362874.png

By removing the 10K resistor and replacing it with the 1,8K the output Gain 6.5 to 1
Originally wanted to swap the the 10k and the 1,8k to get a max gain of 1.1 this is not needed the op amp is unity gain stable.
 
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