Experience with this DIY DAC ?

[wushuliu]

This is the board I ordered.

Where exactly would I attach transformers for the output. I don't see the same 4 coupling caps as in the original boards posted in the thread...

Originally Posted by vazymonga

Hi there,

I have bought this DAC last month, and I'm overall quite happy with it.

I've tried the output directly from the DAC thing, which on my version, just required to solder a cable after the 1K resistor after the first opamp. Here is a high res picture of my DAC:

[johnm]

Solder directly to the pads of the resistors, where it is marked L-/L+/R+/R-.

- John

[wushuliu]

Originally Posted by johnm

Solder directly to the pads of the resistors, where it is marked L-/L+/R+/R-.

- John

duh. I see. missed that at first glance. thanks.

[wushuliu]

Originally Posted by brianco

I use a simple 9vdc mains transformer. That unconnected 15VAC wiring on the transformer may be causing trouble.

I just received the DAC. It came w/ a transformer. I'm not new to DIY, but I am new to connecting transformers and power supplies. Can someone take a look at the pic and let me know if this is how the mains wires are to be connected:

(2) 8v wires - blue ----> '9v' and '0V'
(2) 12v wires - white ---> '13V', '13V'
(1) 0 wire -- black ----> '0V' between 13Vs

(1) 110V wire -yellow ---> IEC 'N'
(1) black wire ---> IEC ? (doesnt seem connected to Line or Ground)
(1) 220V wire - red ---> (guessing this goes unused since I'm in US?)




also the black wire

[Atlplasma]

Originally Posted by wushuliu

I just received the DAC. It came w/ a transformer. I'm not new to DIY, but I am new to connecting transformers and power supplies. Can someone take a look at the pic and let me know if this is how the mains wires are to be connected:

(2) 8v wires - blue ----> '9v' and '0V'
(2) 12v wires - white ---> '13V', '13V'
(1) 0 wire -- black ----> '0V' between 13Vs

(1) 110V wire -yellow ---> IEC 'N'
(1) black wire ---> IEC ? (doesnt seem connected to Line or Ground)
(1) 220V wire - red ---> (guessing this goes unused since I'm in US?)


This looks like the same power supply that came with my DAC. That package also included a cd with a pdf of the power transformer connections. I made my connections as you indicated in your drawing and everything is working fine.

also the black wire

[wushuliu]

So no additional wires have to be soldered to the IEC, correct? I can't tell what the black 0V wire to the IEC is connected to...

thanks I just found the cd; it was sloppily wrapped in white paper and no case and I probably would have tossed it if you hadn't mentioned it.

[wushuliu]

To clarify my question above. My main concern is that the IEC inlet pictured above has four prongs for attaching mains. The Yellow (110V) is attached to Neutral and the black wire I can't tell, but it's not the middle Ground lug or Line/Hot. I have not seen an IEC like this and the wiring color code is different, so before I plug anything in any thoughts would be appreciated

[idlehands]

The 4 prong IEC inlet looks like a standard fused inlet with the yellow wire on negative and black on the positive( after the fuse). I have never worked with a transformer with 3 primaries, they usually have 2 or 4, I think that the original poster should contact the vender. If you can get a proper answer then I'd test the secondary voltages before hooking it up to the DAC.

Also being a safety freak, I wouldn't have exposed live mains sat there in the open, I'd put the IEC inlet and tranny in some sort of temporary enclosure and run the low voltage wires out from that.

Seperate transformers for the opamp bit and chips should should give the best sound.

[wushuliu]

Originally Posted by idlehands

The 4 prong IEC inlet looks like a standard fused inlet with the yellow wire on negative and black on the positive( after the fuse). I have never worked with a transformer with 3 primaries, they usually have 2 or 4, I think that the original poster should contact the vender. If you can get a proper answer then I'd test the secondary voltages before hooking it up to the DAC.

Also being a safety freak, I wouldn't have exposed live mains sat there in the open, I'd put the IEC inlet and tranny in some sort of temporary enclosure and run the low voltage wires out from that.

Seperate transformers for the opamp bit and chips should should give the best sound.

Thanks for the reply. I figured it out. I took a second look and found the compartment w/ the fuse after seeing a similar inlet at Apexjr. The other primary is for 220V countries, so it won't be used. I was not about to plug it in just like in the photo, I just wanted to provide a visual aid for my questions. I'll probably build a wood enclosure.

[gamgee123]

Hello everybody, another bandwagon jumper over here...
...after reading all 46 pages, my head feels slightly inflated and all that stuff, you guys wrote, is kind of mixed up inside somewhere...

While reading, I tried to source some trannies and found localy available Monacor LTR-110 (is this the right stuff? http://www.chipoteka.hr/artikl/8011601421).
As I am not soldering iron wizzard I would really apreciate if someone (McGyver?) could make some "DIY DAC/Monacor LTR-110 for Dummies" instructions. I know I should be able to extract that info from aforementioned 46 pages, but it is all mixed up in my head and I'm affraid that I'll fry something.
I have upsampling/USB version of DAC.
Thank you!