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DAC: CS4398 with CS8416+CM102s
DAC: CS4398 with CS8416+CM102s
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Old 27th April 2017, 12:45 PM   #111
yngvejos is offline yngvejos  Norway
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I tried running it for a while today, and get some artifacts like pops and crackles and loss of signal.
Some times the sound come back by itself and sometimes it comes back if I cycle the power.

Any suggestions what can cause this?
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Old 27th April 2017, 02:48 PM   #112
yngvejos is offline yngvejos  Norway
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Never mind, got frustrated and blasted the board with a hot air gun to reflow all pins on the ICs at the same time. It works fine now, but I fried a lot of caps.

I don't want to replace all those caps, so I ordered a new kit where I will reflow all ICs properly before I populate the board.

I can use my current board for experiments.
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Last edited by yngvejos; 27th April 2017 at 02:50 PM.
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Old 15th May 2017, 10:36 AM   #113
yngvejos is offline yngvejos  Norway
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I have a problem with input selection.
when testing with a laptop and an spdif source the usb signal unlocked fine a while after I stopped playing music on the computer. When I connect it to my desktop computer, the dacs locks on USB as long as the cable is plugged in.
Any suggestions how I can get usb to unlock when there's no sound?
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Old 27th October 2017, 09:07 AM   #114
gideon1990 is offline gideon1990  Netherlands
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So I was wondering, this cs4398 costs ~11 dollar while the whole kit is like 25 dollar, so it must be a clone/fake chip. Did anyone try to replace the cs4398 with a genuine one?
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Old 4th November 2017, 05:39 PM   #115
microfi is offline microfi  Belgium
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Has anyone tried this DAC with a SMPS?

I've got a 12v 2a PSU which I'd like to use with this DAC, but I don't know how to connect it. There seems to be a separate input for the analog and the digital section of the board, is that correct?
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Old 27th April 2018, 05:48 AM   #116
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by SoNic_real_one View Post
As title says I did buy this eBay DAC board and associated enclosure from along1986090. Used my transformers.
CS4398 with CS8416+CM102s, provides coaxial SPDIF and USB inputs.
First impressions:
Enclosure definitelly well done, with (almost) all necessary hardware, holes in exact locations to match the board. Kind of long (10", plus 1/4" front aluminium plate), I guess it can be used to add a dedicated headphones amp.
I did buy the pre-solderd board. Inspected with the magnifier glass showed an OK grade of soldering. PCB is in filled ground technique and parts are like shown in the picture.

Initial tests had a sligtly distorted signal and analized with my E-MU1820m showed a really bad signal. I did replace the 5532 that was on board with LM4562 that I hade around and everything started to look better. I suspect that the 5532 was either a fake or a damaged exemplar. There is no capacitor or resitors on OpAmp outputs, so it is easy to be damaged.
At -2dB looks decent. The output stage overloads my ADC input at higher than -2dB (all the other DAC's that I tested didn't manage to do that).
The output stage is not done per recomended schematics in the datasheet.

USB input:
CM102 locks only onto 16bit/48kHz signals. 16bit/44.1kHz is not supported in Windows7 mixer (WASAPI).
If looses the connection with the PC, static noise is outputted till the next power off/on cycle. The automatic switching could be done better I guess...
Altough in Win 7 there is no need for drivers, here is a package that provides a little more that basic USB. This driver looks like it does the resampling to 48kHz automatically.
Click the image to open in full size.

Coax SPDIF:
Locks on 44.1-96kHz, 16 or 24 bit. I don't have a SPDIF source capable of 192kHz to fully test the CS8416.
Click the image to open in full size.

Using Foobar with resampling to 48kHz would allow USB connection to work at any rate, but I do prefer the coax.

All in all, sounds decent, especially for the price. THD+N with LM4562 is at -94dB. OpAmp upgrade is strongly recomended and looks like some of the AC grid noise could be reduced by better filtering.
Direct coupling of the outputs leaves some higher levels of 10Hz noise creep into the output chain as seen in the coax graph (at USB I forgot to extend the range below 20Hz).

The seller give the schematics (at my request).
5532 is very good. And very cheap. Manufacturers will not produce fake.
NE5532 is an open internal circuit, there are many manufacturers in the production. So it was very cheap.
It doesn't mean it's bad performance.

Believe I'm NE5532 home furnishings. And it will not damage.

At least I sell out of the number of more than ten thousand. Have not heard about the possibility of damage.

And I don't think the LM 4562 any performance.

And I don't recommend to do any changes. Of course. 222 the capacitance can be reduced
Such as the use of 102 n = 1. It can reduce high frequency attenuation.

All the other. Don't need to change. Because there won't be affected.
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Old 27th April 2018, 05:58 AM   #117
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by yngvejos View Post
Never mind, got frustrated and blasted the board with a hot air gun to reflow all pins on the ICs at the same time. It works fine now, but I fried a lot of caps.

I don't want to replace all those caps, so I ordered a new kit where I will reflow all ICs properly before I populate the board.

I can use my current board for experiments.

This looks horrible. Like sulfuric acid.

The test of IC is through artificial optical. There will be no problem. Don't want to get them down.

Install only need to use the constant temperature soldering iron. Can not use 220 v - 110 - v soldering pen is ok.
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Old 4th May 2018, 09:56 PM   #118
bobbykdas is offline bobbykdas  Russian Federation
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Default My experience

Hi Guys,

I used this board in my setup. Instead of OpAmp I used tube output.
It played really good through CM6631A USB receiver, but...

When I applied a small tweak to VREF and VA it started to play really better. I added RC after 5V AMS (10 Ohm + Low ESR 3300uF shunted with stock PP). These power supply lines are quite sensitive. Also I put VD to the digital 9V PS line instead of audio.

The next step is to add Voltage Ref + LPF + OpAmp + transistor separately for VA and VREF. It is cheap but gives tremendous change in sound. I used this tweak with AK4490EQ DAC and the difference is huge.

BTW, after a year of permanent usage I tried to use stock USB input and it did not work. But I do not care, CM6631A does excellent re-clock and supports up to 192/24.
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File Type: jpg IMG_20180424_115443.jpg (821.5 KB, 34 views)

Last edited by bobbykdas; 4th May 2018 at 10:00 PM.
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Old 20th June 2018, 08:38 AM   #119
audio_tony is offline audio_tony  United Kingdom
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Default Can't get a flat response

I just can't seem to get a flat response out of my dac.

It begins rolling rolling off at about 10kHz being .32dB down (@ 10k) and by the time it's got to 20kHz it's about 1.89dB down.

My other DACs manage a fairly flat response right up to 20kHz.

I have experimented with different filter settings, however it looks as though the response is rolled off before even getting to the output filter.

Interestingly, the other CS4398 DAC I have has a much flatter response.

It's marginally better at 192kHz but not as good as it should be...

Note: All measurements shown performed at 24/44.1kHz

See graphs for reference - the second graph is my USB interface (Focusrite) at 24/44.1kHz
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File Type: png focusrite.png (4.0 KB, 8 views)
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