Mod your Beresford 7520

[Shanedudddy2]

Goin to try a No opamp mod, bypassing the opamp and straight to integrated amplifier, I wonder if it will work

[boomtheroom]

got my beresford today...nly problem is my amp in in the other room and about 10 meters of coax cable is between my computer spdif output and the dac...= lots of interference :-< any ideas for a fix?

[StanleyB]

Goin to try a No opamp mod, bypassing the opamp and straight to integrated amplifier, I wonder if it will work

I used to offer such a mod a few years back. However, the output from the PCM1716 is only 0.6Vrms. So you should connect the DAC's output to an AUX input on your amp. The WM8716 has a higher output at 1Vrms, which makes it a more attractive option.

[Shanedudddy2]

hmm I have both so will try both and report how they are stock, is there anyway to boost it perhaps,to make it work better, just curious, saw something in another page here..hmm Caimen PSU page maybe where someone had modded to use no opamps.

[lemon]

Something like this...with all outputs functional!

[Shanedudddy2]

If you could PLEASE please provide me in some moderate detail, piccies would be nice of what you did and where on the board I would be oh so thankful. ^_^
Also how does it sound in comparison to various opamps you have used?
Thanks

[Gazjam]

Now this is interesting....

[SSF]

Hi Lemon,

Can you still close the lid?
I recently put 2 discreet opamp and they stick out.

[Shanedudddy2]

which discreet?
are they an improvement?

[lemon]

Yes, I will give you any info about this, but forgive me for my "bad" english.

1) Yes, I can still close the lid
2) From the pdf of DAC, you find the Vout...they are to pin13 (R) & pin16(L). Then with a polymeter, find the appropriate points with the same signal on PCB...these are:



3) From each point, put a MKP capacitor 2.2uF to RCA. I used the Solen
4) Put a resistor between RCA(+) and RCA(-) for each RCA mount (I must find my notes for the value).

You ask me "How does it sound in comparison to various opamps I have used?"
Very well...there is no opamp to give me the same sound! And I have used the original 5532, the BB OPA2134 and the 4032.
Due, to lower Vrms output...1Vrms, you need to give more power to have the same level of sound - but the stereo image is more (left and right and up) and the voices are less compressed.

The next month, I will try to measure this direct output and I will give you the result.
I am not a technician, a hobbist-man only.