Just like unbuffered, take + and + buffered from each channel on a board....
You need high impedance headphones for good result, as usual each output on a bridged buffer see half the impedance....
Yes I know that, but at HIFIDUINO it is said:
Glt is referring to powering the Soekris through the J2 header (instead of J1), not using the J2 header to power the s/pdif circuitry. The former is indeed a bad idea - the latter is just fine.
Thanks. I'm using 300ohm cans. Is there any real benefit to tying the - outputs to the corresponding + of the opposing side? Would this provide more output current? I'm testing this now and it appears to work good. Tons of power output with Sennheiser HD800. Loud and full bodied.
@oneoclock
At first sight it looks good to me, so i made my own simulation.
Simulating with original ceramics (mounted on the board) i get some ringing at transiton point especially with fast rise times.
But after adding a 100uF polimer it looks better to me.
Can you show us your whole schematic?
P.S.: At murata Homepage you can get specific sim models with bias voltage.
At first sight it looks good to me, so i made my own simulation.
Simulating with original ceramics (mounted on the board) i get some ringing at transiton point especially with fast rise times.
But after adding a 100uF polimer it looks better to me.
Can you show us your whole schematic?
P.S.: At murata Homepage you can get specific sim models with bias voltage.
Didn't take long until I already answered my own question. Using the - leads would just use the op-amp generated inverted signal which defeats the purpose of the other ladder generating that for you. I suppose it could be possible to use the - leads to drive a 2nd set of headphones...
So when connecting each + lead from each side, correct wiring for each ladder is L = hot, R = cold, correct? I just want to confirm as the documentation is a bit sparse on balanced mode.
v2 does not use a low-res mod. The low-res mod is a suggested mod by Paul from moredamfilters. You probably want to read that article more since you're quoting that. Vref musings: the final frontier? | moreDAMfilters... he has another post later that talks about impedance from the capacitors and how using a combination of caps may help there. There isn't a simple, easy fixed solution. Do what you want... based on who's ever experience you trust.
At the bottom of that page
Current state of the mDf dam1021
Mods done so far are restricted to the vref and output buffers.
Image below shows the "Low Res Mod" - 0R/499R/0.01R
1.2nF ladder filter cap replaced with 470pF PSS film cap
Output buffer "unity gain" mod with 1K 0.05% gain set resistors, and 470pF caps removed from LME49724 feedback loop.
Added caps - using Glt's wire-thru-via method... currently at 3 x 470uF per Vref
So even if he talks about 5, seem like he has actually added 3.
Hello,
Finally, we tried (Oneoclock and me) the superegulator mod. From the measure view, the results are huge (Very low impedance), but our surprise "subjetive point of view" is that we can hear this upgrade and is really big achievement (soundwise).
I our oppinion is a must, very clean highs like the mod 1, plus a deep bass full of details, much more equilibrated.
Is the best DAC that we heard until this moment
We are very happy :-D
Finally, we tried (Oneoclock and me) the superegulator mod. From the measure view, the results are huge (Very low impedance), but our surprise "subjetive point of view" is that we can hear this upgrade and is really big achievement (soundwise).
I our oppinion is a must, very clean highs like the mod 1, plus a deep bass full of details, much more equilibrated.
Is the best DAC that we heard until this moment
We are very happy :-D