You can save huge money. This DAC can compare (and beat some) with the most expensive DACs on the market. You can build it for a few bucks.
If you buy 7812/7912 7805/7905 regulators, I highly recommend the OnSemi brand. Do not use too much filtration after the regulators, rather increase the filtration before regulators (the filtration between diode bridge and regulators). It is the cheapest (and still enough) solution for this DAC.
If you want something cheap for I2S, simply start with USB to I2S based on PCM2706. It is total cheap from china, as a plug and play device (purple PCB, cost about 6 usd with shipping). R-2R DAC is not so much sensitive to jitter, so you will be fine with this low cost. An xmos based I2S can be tried later.
I bet that the sound will be better as with the most expensive delta-sigma, which you, or your friend find at home
Just start cheap and then you can try to upgrade. After an upgrade carefully listen to a change in the music
Is it better to connect rpi from this usb chip to i2s dac instead directly use the i2s pin on it? 8-0
Is it automatically recognized by Volumio?
Nah, the 7812/7912 are very simple, just buy a cheap ferroboard or as good pins to pins on a wood-sheet.
look at if you have an old cdplayers of the 80s 90s : constructors was using them, but most didn't know how to make them sound good.
It needs just behind the enter pin (so : bridge rectifier/traffo side) a low esr caps : for instance a 100 uf/220 uf Panasonic FC or an Elna Silmic. But in the output pin towards the load, it needs a very bad esr cap : an old one took from an old circuit will do : 100/220 uf... then at the feet o the load : on the pcb a good esr one : panasonic FC again, that's it
If the pcb has just an input, then you can improve little by little your regs...
this programable one is better but as a litter more components : Simple Voltage Regulators Part 1: Noise - [English]
look at if you have an old cdplayers of the 80s 90s : constructors was using them, but most didn't know how to make them sound good.
It needs just behind the enter pin (so : bridge rectifier/traffo side) a low esr caps : for instance a 100 uf/220 uf Panasonic FC or an Elna Silmic. But in the output pin towards the load, it needs a very bad esr cap : an old one took from an old circuit will do : 100/220 uf... then at the feet o the load : on the pcb a good esr one : panasonic FC again, that's it
If the pcb has just an input, then you can improve little by little your regs...
this programable one is better but as a litter more components : Simple Voltage Regulators Part 1: Noise - [English]
Last edited:
If you want to use rpi, connect the rpi pinst directly to this DAC, RPI-DAC ...
PCM2706 is a cheap solution without rpi, PCM2706 is USB to I2S bridge.
@Sadface : welcome in the club! we are looking for your contribution
@surfparadise : ebay is full of cheap PCB regulators, like these based on 317/337, keywords:
"LM317 LM337 Adjustable Rectifier Stabilized Voltage Power Supply Bare PCB Board"
"LM317 LM337 ±1.5V~35V Adjustable Dual Voltage Regulator Power Supply Bare PCB"
you can populate it with a high quality parts and tweak it easily ...
@surfparadise : ebay is full of cheap PCB regulators, like these based on 317/337, keywords:
"LM317 LM337 Adjustable Rectifier Stabilized Voltage Power Supply Bare PCB Board"
"LM317 LM337 ±1.5V~35V Adjustable Dual Voltage Regulator Power Supply Bare PCB"
you can populate it with a high quality parts and tweak it easily ...
Last edited:
Is passive IV + tube buffer (no gain?) your preferred choice for the PCM56?
I have been using purely passive resistor IV (no trafo) with AD1862 and it sounds so good, the SQ trade offs of passive IV with this DAC are very low compared to any other DAC ive used... this explains why the trafo also sounded so good here compared to other applications.
@Sadface : welcome in the club! we are looking for your contribution
@surfparadise : ebay is full of cheap PCB regulators, like these based on 317/337, keywords:
"LM317 LM337 Adjustable Rectifier Stabilized Voltage Power Supply Bare PCB Board"
"LM317 LM337 ±1.5V~35V Adjustable Dual Voltage Regulator Power Supply Bare PCB"
you can populate it with a high quality parts and tweak it easily ...
Yeah...that’s was my idea
just received some AD1862NJ from China. measured them in one channel. they appear a little different and I would say one needs to buy 2x in order to pick the good ones. and yes, the distortion is audible - dirty highs and sibilance
they are real AD of course, but being used, so good luck is needed
they are real AD of course, but being used, so good luck is needed
Attachments
It sometimes happens even with parts from a trusted source. Over the years in electronics I experienced: corrupted voltage regulator, one distorted opamp (LME49710HA), 2 dead microcontrollers (PIC), resistor (KOA Speer!) with open circuit ... everything from a trusted source ...
the question is, who guarantees this group buy if a damaged component appears there?
... everything from a trusted source ... the question is, who guarantees this group buy if a damaged component appears there?
It can simply be a second choice quality control genuine stock that are planed for garbadge ! putt one in a pair or a quad : no little economy if you're a merchand ! Commercial ethic is poor in China, they sells themselves contaminated milk for their babies, so a bad da chip, you joke, no problem, lol . Such people waste the efforts of the others good vendors alas !
I received my pair in less than 15 days from a China shop but I didn't measured the chips yet ... I never tried though, maybe with Arta or Rew... not sure my Pre tracker pro soundcard fro E-Mu is good enough for such a job. While the 70 db noise floor on the thir harmonic posted should be detected if it's a bad chip as above !
That's why I asked the shop to avoid it. That's te only power that cunsumers have today.
. Such people waste the efforts of the others good vendors alas ! I received my pair in less than 15 days from a China shop but I didn't measured the chips yet ... I never tried though, maybe with Arta or Rew... not sure my Pre tracker pro soundcard fro E-Mu is good enough for such a job. While the 70 db noise floor on the thir harmonic posted should be detected if it's a bad chip as above !
That's why I asked the shop to avoid it. That's te only power that cunsumers have today.
Last edited: