For now, we don't have a plan to close GB.
We have about 40 PCB's for 2.5.2 and 20 for 2.6.2 and start production this week.
We will start to ship orders in a week. There is a small delay because some parts do not meet our quality standard. We decided to reorder them.
Order List updated. Pls check.
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Couple of questions:
Which version of the DSC is displayed in the stacked (3rd) picture?
Also, does it come with the Amanero card or we need to procure Amanero separately?
If separately, will the one purchased from Amanero directly fit the stacked layout.?
What else do we need to purchase to get a completely working DAC (power transformer, etc)?
1. It's 2.5.2. There are several way for assembling.
2. No, it does not. Amanero needs to be bought separately. You can use any USB interface with standart Amanero pinout. If not, wire DSC manually. But remember, that XMOS produce loud pop at start.
3. You need power transformer (6 - 7 V is enough) and rectifier. Two channels should be powered separately. DSC v2 has LDO ADP7118 preinstalled. But you can disable it and use any other voltage regulator. 5V and min 150mA per channel is needed.
Thanks Vid' that's useful to know. Does the current drawn by DSC2 vary much, for example with different data rates?
At some point I would like to experiment with Salas Reflektor-D shunt regulated supplies, hence my question. I will measure myself when I get to that point.
Personally I did't measure current consumption. It was done by Pavel and his recommendation is 150-200mA per channel.
As I see in datasheet for 74AHCT595 (shift register used in DSC v2) the Absolute Maximum Ratings is 25mA. We have 8 of them per channel. That's why maximum current is 8x25mA = 200mA, I think.
I've tried Salas Reflector D with DSC v2.5. With R1 = 2Ohm (recommended load draw 50-100mA) - not work. Maybe I was wrong somewhere (connections for example). I have not try R1 = 1,2/1,5 Ohm (150-350mA).
If you will get a positive results give me a note pls. I have a couple Salas Reflector D (powering my Soekris dam1121)
But Salas Reflector is very hot (up to 60 C). I had to use active cooling for dam 1121.
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I'm a goat in electronics, so just to summarize, all I need to power on the whole board is:
[with internal LDO] A transformer 240V to 7V AC with dual secondary and a diode rectifier bridge (Shottky) for each of the lanes
[without internal LDO] ?? . I read here [wiki=http://www.audiodesignguide.com/DSC1/index.html]%[/wiki] that a 3-way power supply is required in order to provide 3.3V, 5V and 7.5VDC but dunno if all voltages are required for the board (no ak4137)
Have a nice day. Massimiliano
I've tried Salas Reflector D with DSC v2.5. With R1 = 2Ohm (recommended load draw 50-100mA) - not work. Maybe I was wrong somewhere (connections for example). I have not try R1 = 1,2/1,5 Ohm (150-350mA).
If you will get a positive results give me a note pls. I have a couple Salas Reflector D (powering my Soekris dam1121)
But Salas Reflector is very hot (up to 60 C). I had to use active cooling for dam 1121.
Hi Vit'. I'm not surprised the Reflektor D didn't work with the 2ohm resistor. You need to set R1 for the load plus the shunt current (in our case let's assume 200mA load + 50mA = 250mA) Referring to the Reflektor-D manual suggests R1 needs to be 1.2ohms (maybe a little higher to reduce the shunt current = heat). All the information is in the Reflektor manual.
Maybe worth experimenting with R1 in your Soekris DAC too?
Of course, I'll report back in due course.
Yes (even 6V AC is enough, like in my case). Don't foget to add some capacitors to stabilise voltage. It may look like in the photo below.
You need only 5V (two lines) to power DSC2.5.2 from good power supply.
No need in 3.3V, Amanero board supply it to DSC 2.5.2.
No need in 7.5V. It's for AK4137 I think.
Attachments
Yes, thx. I use Salas Reflector for 50mA max in dam1121. That's why I choose R1 = 2 Ohm. Agree, that for DSC 2.5.2 R1=1,2Ohms looks like a sweet pot.
In case of DSC 2.5, after Salas I decided to try LT3045 LDO (I have some) instead of stock TPS7A4700 to check the effect of power supply on DSC (main reason of my experiments). Then I did not see any difference.
If using Salas Reflector will result in increase in sound quality, I tried it immediately
If you will get a positive results give me a note pls. I have a couple Salas Reflector D (powering my Soekris dam1121)
But Salas Reflector is very hot (up to 60 C). I had to use active cooling for dam 1121.
Vit... could you describe in a few words the sound difference between 1121 and DSCv2 please?
//
After leaving it for too long because I've been enjoying my DSC2 V2.6.0, this morning I finally spent some time diagnosing and fixing the issue with my DAM1121 build (turned out to be a grounding mistake) and it is now making music. I'll be able to compare the DAM and DSC2 later in the week.
It's a very good idea and we decided to do so.
By default, we will include all connectors for default and stacked configuration, and leave them unsoldered.
If someone wants fully soldered boards, we do it.
Finally User Guide for 2.5.2 is ready.
Link
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DSCv2 is much more detailed with excellent localization and analog-like sound.
IMHO dsc1121 gives a more "body" in sound with less details (I use direct output from R2R without additional output stage).
Both are very good with slightly different interpretations of music. I can't choose one, but spend more time with DSC.