The Belleson regulators are from Superpower Super Regulator by Belleson. I chose them for their specifications. And they also seem to be both fairly reasonably priced and quite small.
Hi, at the moment I have very limited access to both the internet and info as I am on a customers site and cant use my own machine, if (IF) I can get on the internet in the dole hostel I have been put in I will post some examples I have on my laptop.
Basically you are isolating the signals return path from the ground plane so minimising the chance of crosstalk between channels, so you run a separate route for the return, joining it to GND as near to the active input device as possible.
Basically you are isolating the signals return path from the ground plane so minimising the chance of crosstalk between channels, so you run a separate route for the return, joining it to GND as near to the active input device as possible.
So, the prototype is now up and running, full speed. Four channels. Two and two channels share the same regulators. It looks a bit messy in the picture, but it's not easy to fit dacs and volume controls and buffers in the same cabinet.
Next up is a new batch of boards with a bit larger PSU caps, more space, more thermal relief, SMD-caps closer to the dac, HASL pads and a new name.
What do people here feel about analog low pass filtering? I've put in a small cap across the IV-resistor. Tried different values, ranging from 150pF to 1nF. But I found out that I actually preferred it without the cap.
Next up is a new batch of boards with a bit larger PSU caps, more space, more thermal relief, SMD-caps closer to the dac, HASL pads and a new name.
What do people here feel about analog low pass filtering? I've put in a small cap across the IV-resistor. Tried different values, ranging from 150pF to 1nF. But I found out that I actually preferred it without the cap.
Attachments
Hi Jorgen,
Look at this : NOS 384 AD1865 with built in LDR
do you see the good little ufl board to stack on the JLSounds lab board for better outputs ! If we know to source it then we can go to the JLSounds basic board, then swap the FOX crystals with NDK ones for maybe a better layout than their own crystals daughter boards... as they don't seem to move their actual layout design...
Ian told us maybe the PCM boards will be shipped soon... but it's uncertain !
Look at this : NOS 384 AD1865 with built in LDR
do you see the good little ufl board to stack on the JLSounds lab board for better outputs ! If we know to source it then we can go to the JLSounds basic board, then swap the FOX crystals with NDK ones for maybe a better layout than their own crystals daughter boards... as they don't seem to move their actual layout design...
Ian told us maybe the PCM boards will be shipped soon... but it's uncertain !
Revised version
I've got the revised version up and running. It's got some minor changes. There's actually space for all the components and terminals, there's space for optional U.fl connentors underneath the board. There are SMD-pads for 1210 film caps underneath the board.
Been making a version with naked z-foil i/v resistors, Panasonic SEP caps and Belleson regulators. Works like a charm up to 384 kHz, but I have some trouble with the exaU2I receiver since it only has 11.28Mhz and 24.58Mhz oscillators.
I've completely abandoned Ian Canada's I2S->PCM converter board. I made a neater solution that I call the LE flipper. It's a REALLY simple device with one 74HC00, that outputs an inverted LE signal which I feed to the right channel dac. To align the bitstream I just reduce the volume in JRiver Media Center by 78.27 dB (13 bits). Works perfectly with any I2S-receiver and actually sounds better too.
Attached some photos of the newest board. No ceramics on this one.
I've got the revised version up and running. It's got some minor changes. There's actually space for all the components and terminals, there's space for optional U.fl connentors underneath the board. There are SMD-pads for 1210 film caps underneath the board.
Been making a version with naked z-foil i/v resistors, Panasonic SEP caps and Belleson regulators. Works like a charm up to 384 kHz, but I have some trouble with the exaU2I receiver since it only has 11.28Mhz and 24.58Mhz oscillators.
I've completely abandoned Ian Canada's I2S->PCM converter board. I made a neater solution that I call the LE flipper. It's a REALLY simple device with one 74HC00, that outputs an inverted LE signal which I feed to the right channel dac. To align the bitstream I just reduce the volume in JRiver Media Center by 78.27 dB (13 bits). Works perfectly with any I2S-receiver and actually sounds better too.
Attached some photos of the newest board. No ceramics on this one.
Attachments
Oh, and the new board has a tinned pads which makes the solder flow so much more nicely. The gold plated board was hopeless when soldering stuff to the ground plane.
I've sourced dac chips from two different sellers on e-bay, both which I can recommend.
AD1862 - connector_usa - sells new old stock chips
AD1862 - hifi-szjxic - sells used chips
I've sourced dac chips from two different sellers on e-bay, both which I can recommend.
AD1862 - connector_usa - sells new old stock chips
AD1862 - hifi-szjxic - sells used chips
Great job Jorgen,
Do the 470 uf before the Bellasons regs the advised value by Bellason ?
Does anybody know if the Bellassons need a output cap ? For lowering the impedance or to make a local reservor tank for the load ?
Look at the caps I advised you in PM for output analog stage.
Jorgen : where do you connect the pcbs together ?
What RMS voltage have you with the 1 mA of the AD1862 with the Pedja's stage you use but without the current renforcment maid by the 2SK170 fet in its original paper (maid for the tda1541 which as a 0/-4 mA swing iirc)?
cheers
Do the 470 uf before the Bellasons regs the advised value by Bellason ?
Does anybody know if the Bellassons need a output cap ? For lowering the impedance or to make a local reservor tank for the load ?
Look at the caps I advised you in PM for output analog stage.
Jorgen : where do you connect the pcbs together ?
What RMS voltage have you with the 1 mA of the AD1862 with the Pedja's stage you use but without the current renforcment maid by the 2SK170 fet in its original paper (maid for the tda1541 which as a 0/-4 mA swing iirc)?
cheers
Jorgen,
Have an idea in relation with what i writted you in PM : could you try before the Bellason the UCC ASA caps instead the sepc but stay with little SEPC after the Bellasson in a first listening test ?
Try after the opposite : it will give you the sensibility of the mlyout and those regs to caps mods
Have an idea in relation with what i writted you in PM : could you try before the Bellason the UCC ASA caps instead the sepc but stay with little SEPC after the Bellasson in a first listening test ?
Try after the opposite : it will give you the sensibility of the mlyout and those regs to caps mods
Hi Jorgen,
May you please to publish a more focused photograph of one of your board in situation (your actual working DAC). I need it to connect the two mono PCBs togethers via some Gnd Vias
... but I'm a little worry as I don't which ones and I am a little scarred to create lound grounds loops !!! Does it need more than one link between the 2 pcbs ? Which ones do you use ?
Is there some advices as the origin of this thread was the difficulty to create a standalone pcb with two mono AD1862 chips ? Marce if you read this ?
thanks in advance for your hints
kind regards
Eldam
May you please to publish a more focused photograph of one of your board in situation (your actual working DAC). I need it to connect the two mono PCBs togethers via some Gnd Vias
... but I'm a little worry as I don't which ones and I am a little scarred to create lound grounds loops !!! Does it need more than one link between the 2 pcbs ? Which ones do you use ?
Is there some advices as the origin of this thread was the difficulty to create a standalone pcb with two mono AD1862 chips ? Marce if you read this
?thanks in advance for your hints
kind regards
Eldam
If so I'd want to release something that is a bit more mature. Something that is tried and tested, and perhaps a bit more user friendly.
I've connected the boards together at each of the pwr gnd pads, and also at the dgnd. I've also tried to connect them together through the mounting holes, as these are also connected to ground. There seems to be no difference. No problems with ground loops. But perhaps someone has a bit more knowledge on this topic. Ground loops is a difficult topic.
Thank you Jorgen,
I was not sure about what you already said me before. I just remember of what Marce had often been saying : the current will find the easy and the shortest way. Jut here a little worry because of what you said about the internal dac chip and the AGND and DGND pins very near from each other !
@ Marce,
Wow... you should learn to Padawans in a Britanic College... your savoir faire is too rare.
Off course Marce, thank you and come back when you want... family and rest first... and eating roots (Yoda Jedi) .
I was not sure about what you already said me before. I just remember of what Marce had often been saying : the current will find the easy and the shortest way. Jut here a little worry because of what you said about the internal dac chip and the AGND and DGND pins very near from each other !
@ Marce,
Wow... you should learn to Padawans in a Britanic College... your savoir faire is too rare.
Off course Marce, thank you and come back when you want... family and rest first... and eating roots (Yoda Jedi)
.Hello Painkiller
great thread thanks!
Could you now Publish schematics and pcbs as well as BOM ?
Am thinking of 3 ways DAC. What about the clock in your design ?
BR
Jean-Louis
Hey, everyone! After ages of this project being put on hold I finally decided to complete my latest iteration of the board design. I made it almost fully smd. Unfortunately I seem to have LOST my gerber files! I don't know how that happened. And I only got a few boards made, and I gave some of them away.
Anyway. It works! And it plays beautiful music. Much much better than any discrete ladder dac or modern ESS dac I have heard. I am so happy that I finally decided to finish this project. This will definitely stay in my system for now.
Did anyone else manage to put together a set of boards? To those of you who received them by mail from me?
Anyway. It works! And it plays beautiful music. Much much better than any discrete ladder dac or modern ESS dac I have heard. I am so happy that I finally decided to finish this project. This will definitely stay in my system for now.
Did anyone else manage to put together a set of boards? To those of you who received them by mail from me?