Problems with wiring up single chip board
Hi
I have the single chip board, and have wired it all up. Just before I powered it up, I thought that I would do some checks with my continuity meter.
I have wired it as per this photo off an ebay listing for a completed unit.
AK4495SEQ AK4495 DAC decoder AK4118 PCM 384KHZ + XMOS XU208 USB support DSD NEW | eBay
My board is the same version with a different production date:
I am getting continuity between both coaxial connections.
I am also getting continuity between all of the line out connections and ground.
Any ideas?
Hi
I have the single chip board, and have wired it all up. Just before I powered it up, I thought that I would do some checks with my continuity meter.
I have wired it as per this photo off an ebay listing for a completed unit.
AK4495SEQ AK4495 DAC decoder AK4118 PCM 384KHZ + XMOS XU208 USB support DSD NEW | eBay
My board is the same version with a different production date:
An externally hosted image should be here but it was not working when we last tested it.
I am getting continuity between both coaxial connections.
I am also getting continuity between all of the line out connections and ground.
Any ideas?
Hi androa.
That is good news. Thanks so much. I was hoping that the issue might be something like that. I was having panics about me having melted the board.
My digi test points were the two smaller connections closest to the C of COA.
That is good news. Thanks so much. I was hoping that the issue might be something like that. I was having panics about me having melted the board.
My digi test points were the two smaller connections closest to the C of COA.
An externally hosted image should be here but it was not working when we last tested it.
There is very little that you can test on a populated board like this with continuity. Continuity will show you that there is a path between those points which there will be at many points on the board. If you test with resistance a 0 measurement will show a very direct connection and more resistance will show that it has made it's way through more components.
The only thing you can really do damage with is connecting the power supply incorrectly or by actually creating a short somewhere. If you are sure you don't have a short and have the power connected correctly then switch it on and see, preferably with a test speaker or headphone just in case
It is more likely that the code in the micro is not setup for remote control on this version as there is no ir diode included on the board.
An IR diode from china costs nothing so if the code was there it is likely the diode would be too?
On the other input boards the diode is present and function works. I would confirm with the designer that the code is there before going any further.
dublin78: I assume your DAC board is coming with LCD panel fitted with IR diode right? I don't remember if the V pin supposed to be 5V or 3.3V but there should be voltage coming, can you post picture of front and back of your LCD panel board?
second part of successful usage of remote control is pairing, you need to hold your apple remote against your IR diode for 5-7 seconds with menu and right arrow pressed at the same time, message should pop up after successful pairing on your LCD screen
second part of successful usage of remote control is pairing, you need to hold your apple remote against your IR diode for 5-7 seconds with menu and right arrow pressed at the same time, message should pop up after successful pairing on your LCD screen
kukynas: Yes, the DAC comes with a LCD board, with three buttons, and an IR sensor.
I have tried to pair it, as you described, but no luck. My remote is a fake knock off that arrived with no battery or instrcutions for which battery to use. I fitted a 3v battery, and it is impossible to know whether it works. This does not bother me at the moment.
More importantly, I have sound and lock via coax. Celebration over This sounded wonderful, until I played music with more bass. The DAC makes a horrible crackling sound that occurs in time with the bassier notes. This is not noticeable when the amp volume is turned up, but when the amp volume is turned down, it is quite loud, and is all that can be heard.
I have tried it with two digital sources. I have tested the amp with a different source, and it is fine, so it the problem is definitely with this DAC. I have connected the ground to EARTH. No difference.
I have tried to pair it, as you described, but no luck. My remote is a fake knock off that arrived with no battery or instrcutions for which battery to use. I fitted a 3v battery, and it is impossible to know whether it works. This does not bother me at the moment.
More importantly, I have sound and lock via coax. Celebration over
This sounded wonderful, until I played music with more bass. The DAC makes a horrible crackling sound that occurs in time with the bassier notes. This is not noticeable when the amp volume is turned up, but when the amp volume is turned down, it is quite loud, and is all that can be heard.I have tried it with two digital sources. I have tested the amp with a different source, and it is fine, so it the problem is definitely with this DAC. I have connected the ground to EARTH. No difference.
I have finaly made my dac till the end ...but sold it immediately because friend want it ,so good it was.
It was my redesign, modified AK4118 board, modified xmos board modified ak4490 board, lme49990, Mravlcax mini TPS7A4700 reg for 6,1 Vref and Avdd. Mravlcax TPS7A4700 Pro version for 5v digital part, TPS for +-15V, 2000uf FP polymer on Vref....Solid silver wire, 3 Transformers, BNC, gold IEC.... IR works after pairing.
Excellent dac, i wait now for ak4497, and put Tube output on it. I made one and tested it ...magic.
It was my redesign, modified AK4118 board, modified xmos board modified ak4490 board, lme49990, Mravlcax mini TPS7A4700 reg for 6,1 Vref and Avdd. Mravlcax TPS7A4700 Pro version for 5v digital part, TPS for +-15V, 2000uf FP polymer on Vref....Solid silver wire, 3 Transformers, BNC, gold IEC.... IR works after pairing.
Excellent dac, i wait now for ak4497, and put Tube output on it. I made one and tested it ...magic.
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More importantly, I have sound and lock via coax. Celebration over
I have tried it with two digital sources. I have tested the amp with a different source, and it is fine, so it the problem is definitely with this DAC. I have connected the ground to EARTH. No difference.
Sounds like you might be getting clipping from bass transients, how are you controlling the volume?
I have used JRC5534 opamps and they work fine so changing them is unlikely to solve your issue. Can you take a picture of the DAC?
yes and no, his amp might be more sensitive to output load of the DAC so changing opamp might help but I never had this specific problem so I might be wrong
I am using this amp: Input impedance 33K: Sure Electronics' webstore 2 x 500 Watt Class D Audio Amplifier Board Compact - T-AMP
I am using this digital volume control that plugs into the amp: Sure Electronics AA-AA11117 Digital Volume Control Kit
I have an ALPS blue 50K pot at hand that I could use, if needed.
I am using this digital volume control that plugs into the amp: Sure Electronics AA-AA11117 Digital Volume Control Kit
I have an ALPS blue 50K pot at hand that I could use, if needed.
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