Behringer UCA202 - Any "Line Out" mods??

[Karl vd Berg]

Hi there.

I was wondering if anyone has ever done any mod in a DAC like this before.

I've read the NwAvGuy's Behringer UCA202 DAC modifications, but it seems that he did the mods for the headphones output only.

I have the UCA202, too (first pic).

An externally hosted image should be here but it was not working when we last tested it.

The 2nd picture below show two 22uF/6.3V caps (C4, C5) close to the RCA outputs. At the end of NwAvGuy's article, he states the following:

OTHER TWEAKS: As mentioned above, the feedback loop could use some attention. Optimizing the feedback should remove the slight 0.4 dB rise at the highest frequencies and might improve the sound. And I suspect using higher quality output capacitors might lower the output impedance still further. The problem here is finding better parts that will fit inside the original case. All my modifications fit completely inside (although I did have to cut a plastic post off the inside of the case). Better audio-grade output capacitors (and possibly adding quality bypass caps) may also improve the sound quality and further lower the output impedance. It might also be possible to improve the channel separation with some tweaks to the power supply lines feeding the new amp IC.

An externally hosted image should be here but it was not working when we last tested it.

He's actually referring to the other two 100uF/6.3V caps (C14, C15 pointed in the 3rd picture below) which he changed with 2200uF/6.3V ones which are close to volume pot (for the headphones):

An externally hosted image should be here but it was not working when we last tested it.

Now, I'm not sure if C14 and C15 affect also the RCA lineout for audio... or just for the headphones jack.

I'd replace the caps for audio out with better quality caps.

Any ideas? Thank you! 🙂