Just a hint,if you turn an LED arround it won't light up!!! Which means that it's not the LEDs.
Many modern LED's don't conform to the old "standard" for lead identification. Just put it on a DVM on diode range. It will light one round, when it does the red lead is on the anode and the black is going to the cathode. The DVM won't illuminate LED's that have a turn on voltage higher than the DVM open circuit voltage but most common types will.
Did a check on the powersupply board of Doede.
The led's do have a flat side.
Easiest way to know if the led is correct connected is flat side to min side.
I would just say that if there is any doubt then measure and prove it first. I have some "clearwater" red led's in front of me which have the longest lead as cathode and the internally visible led chip is mounted on the anode rather than cathode lead. The flat on these is still the cathode though.
If in doubt... measure 🙂
If in doubt... measure 🙂
It's not an LED problem. For some reason the whole PSU oscillates! I've sent the PSU to Doede but he could not find the problem! I've bought a new PSU
Thanks Per, SQ wise they are both great designs by inspired people and sound great and are within my capability to build being well documented and supported, and probably quite a good match if you are not looking for to much power. By building the whole system myself I could keep all the resistors and wiring in the signal path identical and like this there are no capacitors in the signal path either. But there are always ways to do better with more budget, obviously.
I tried shoriting out the fuses on both 5 and 12 v supplies and the sound became harsh. Now that's really counter intuitive, anybody got any ideas?
Musical Truth
The Belleson 3.3v series voltage regulators and supply caps appear to have broken in. More than 99% of all DACs attempt to turn 0's and 1's into a musical experience using upsampling/oversampling/dithering/digital filters/analog filters/etc. All of this screws up the music. The super expensive DACs do this in a very pleasing way. Now I know what CDs at 44.1k are supposed to sound like. They sound like music within the limits of 44.1k/16bit - nothing added, nothing taken away. Hi-Rez sounds even better.
Putting voltage regulators with fast supply caps on the DDDAC board made more difference than any other change to my DDDAC. IMO, the LF33s did not take me to the promised land of musical truth. I highly recommend replacing/upgrading these. Enjoying my DAC more than ever now.
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Core i7/Win8>JRiver 19/Fidelizer>USB>WaveIO>I2S>Single DDDAC>Buffer>Cinemags
(Salas on 8v and for +/-12v on buffer, Bellesons on WaveIO and 3.3v)
The Belleson 3.3v series voltage regulators and supply caps appear to have broken in. More than 99% of all DACs attempt to turn 0's and 1's into a musical experience using upsampling/oversampling/dithering/digital filters/analog filters/etc. All of this screws up the music. The super expensive DACs do this in a very pleasing way. Now I know what CDs at 44.1k are supposed to sound like. They sound like music within the limits of 44.1k/16bit - nothing added, nothing taken away. Hi-Rez sounds even better.
Putting voltage regulators with fast supply caps on the DDDAC board made more difference than any other change to my DDDAC. IMO, the LF33s did not take me to the promised land of musical truth. I highly recommend replacing/upgrading these. Enjoying my DAC more than ever now.
____________________________________________________
Core i7/Win8>JRiver 19/Fidelizer>USB>WaveIO>I2S>Single DDDAC>Buffer>Cinemags
(Salas on 8v and for +/-12v on buffer, Bellesons on WaveIO and 3.3v)
You are right, i also don't like the Muse KZ in PS applications. Panasonic FR / FC is better choice from my point of view.
Just a question....
could it be an idea to sum up all the "recommended" modifications (maybe in a separate thread)? It is hard to follow on this in such a long thread.
could it be an idea to sum up all the "recommended" modifications (maybe in a separate thread)? It is hard to follow on this in such a long thread.
Good idea...
It’s Doede’s design, imo any “recommendations” are at his digression.
But if you want to make a list of the things you would recommend, by all means.. I'd be intrested.
good point ! I am a bit under time pressure at work, hence few posts and updates in my work, but anyway, I am trying to get my self an overview on some of the tweaks, do listening test my self an make an overview on my website.....
stay tuned a bit ....
stay tuned a bit ....
Finished to build the DDDAC. 🙂
Currently the dac with output capacitor of Amp Ohm FE-XAL-AL 6.8uF.
In addition, a good and silent 12V power supply connected.
And maybe will add 5V power supply for USB board.
Unfortunately , I encountered a problem with the converter.
Static noise can be heard through the headphones on high volume.
[With other DAC I can not hear any static noise.]
How to fix it?
Currently the dac with output capacitor of Amp Ohm FE-XAL-AL 6.8uF.
In addition, a good and silent 12V power supply connected.
And maybe will add 5V power supply for USB board.
Unfortunately , I encountered a problem with the converter.
Static noise can be heard through the headphones on high volume.
[With other DAC I can not hear any static noise.]
How to fix it?
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are you connecting the DAC directly to the amplifier without volume control? and using the audio player for volume control? the nature of the DSC without Oversamling and filtering causes some HF noise which gets audible if you "play" at full analog volume so to speak and than reducing the volume level by reducing the bits in the audio player.
Like Doede says, controlling the volume in software without any attenuation in the analogue part, raises the noise floor significantly. I also learned this through trail and error & found this with other ( also upsampling) DAC’s too (possibly due to other components besides the DAC's them selve) . I suspect a lot of commercial products will have low pass filtering to mitigate this issue, at the expense of SQ.
You could try the same and apply a lowpass filtering cap at the output of the DAC. The DDDAC mainboard v3.0 (if I remember correctly) has provision for this and some possible values are documented by Doede in it's schematics.
You could try the same and apply a lowpass filtering cap at the output of the DAC. The DDDAC mainboard v3.0 (if I remember correctly) has provision for this and some possible values are documented by Doede in it's schematics.
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The DAC is directly connected to the input of the headphone amplifier. [LD MK2]
I dont use the audio player volume control its always on 100%.
Because the headphone amplifier itself have volume control.
What is DSC?
So its not possible get rid of static noise that exists in all the dddac 1974, but only with reducing the lowering the volume on the computer?