robertkd
Been here a while! 
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 27, 2009 10:00:21 GMT
Well I thought about the TDA1543DAC and thought maybe worth a try, oh my it and the power transformer arrived today along with some other goodies thanks Phil, thanks Dave ;D well this is how the TDA1543DAC was shipped, packed in reasonable well and mounted thus on t sheets of acrylic, now to find out if it sounds near as good as it was packed   the quest continues  |
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Post by rbrook on Mar 27, 2009 10:30:12 GMT
My DAC arrived today to i eagerly scrounged a 12VDC transformer and a few hook up cablesFired it up and Very nice for about 30 sec then over the left channel crackle crackle like some one is playing with the RCA cable.  i took the board out and checked it all out for dry solder joints, all looked ok so put it back in and fired it up again worked well untill about 30 sec later then same left channel same crackling sound Grrr. swapped the op-amp out with my spare from my SCHA made no difference.  Any ideas? |
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 27, 2009 10:37:04 GMT
My DAC arrived today to i eagerly scrounged a 12VDC transformer and a few hook up cablesFired it up and Very nice for about 30 sec then over the left channel crackle crackle like some one is playing with the RCA cable. i took the board out and checked it all out for dry solder joints, all looked ok so put it back in and fired it up again worked well untill about 30 sec later then same left channel same crackling sound Grrr. swapped the op-amp out with my spare from my SCHA made no difference. Any ideas? not sure I actually resurrected a Nokia ACH4A charger and it worked well, feeding it with either SPDIF or AES, what are you feeding it with? is yours in a case ? is the PSU ground isolated ? as it has a rail splitter so the PSU must not reference to ground,...important ! Robert |
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Post by rbrook on Mar 27, 2009 11:15:57 GMT
i'm using a external HDD enclosure psu, it is not in a case just sitting in the small plastic box it came with the PSU is double insulated so no earth pin. The right side stays fine its just the left that starts to crackle and distort badly volume almost goes completly on the left.
I'll do a few more tests and see if the time till distortion is the same each time (iffy cap maybe taking time to charge before it shows bad signs?)
Oh and i've tried both SPDIF and optical with both onboard and x-fi as sound sources.
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 27, 2009 11:34:19 GMT
Richard, so you have a ground isolated supply, presume a plug pack do you get the same if you transpose L and R ?? do you get the same if you remove the op amp, yes you will still get audio out Robert |
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Post by rbrook on Mar 27, 2009 11:43:39 GMT
Defiantly a ground isolated plug pack.
I swapped the left and right cables first at the SCHA sound issue was now in right speaker so i swapped cables from DAC output issue was back on left speaker i haven't removed the op-amp and left it out I'll do that now.
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Post by rbrook on Mar 27, 2009 12:00:37 GMT
Ok after leaving off for about an hour i fired it back up and started the stop watch, I start to hear faint static at about 7 min really noticeable at 9 and after 10 min sounds like someone is playing with the left rca plug (Eww after 12 min I'm even getting squealing noises). time to pop out the op-amp then.
OK pulled the op-amp out and it made no difference still crackling sounds on the left makes no difference if music is playing or stopped.
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 27, 2009 12:14:36 GMT
Ok after leaving off for about an hour i fired it back up and started the stop watch, I start to hear faint static at about 7 min really noticeable at 9 and after 10 min sounds like someone is playing with the left rca plug (Eww after 12 min I'm even getting squealing noises). time to pop out the op-amp then. OK pulled the op-amp out and it made no difference still crackling sounds on the left makes no difference if music is playing or stopped. Ok all things being equal me thinks board is faulty, communicate the issue, I'm sure they will replace it for you no problems.  mmm shame Robert |
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Post by rbrook on Mar 27, 2009 12:19:13 GMT
Cheers for your help Robert. I was hoping it would be something i could fix (i hate returning goods). Well at least i learned a few things. |
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 29, 2009 8:24:54 GMT
Cheers for your help Robert. I was hoping it would be something i could fix (i hate returning goods). Well at least i learned a few things. I know what you mean, if you keep it civil they generally do go out of their way to accommodate you and sort out the problem in my experience. As an aside I'm trying the TDA1543DAC out sounding pretty damn good, perhaps not as detaied as the PCM1793 none the less still very refined, less then an hour so on the clock will let soak test for a couple of days to see what might eventuate. yes alright, Alex listening to Dianna Krall meh  yes boys and girls don't do this at home or the dinosaur will bite you if not the mains will,...! Robert |
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Post by rbrook on Mar 29, 2009 11:19:00 GMT
It defiantly looks flasher than the PCM1793. Is that board in the middle of it supported with rubber bands? Ahh to isolate it from the Dinosaur footsteps |
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 29, 2009 11:25:58 GMT
It defiantly looks flasher than the PCM1793. Is that board in the middle of it supported with rubber bands? Ahh to isolate it from the Dinosaur footsteps yeah red "O" rings and the same boy genius space cadet used tinned copper wire to connect it to the main PCBA likely looked good on paper, still sounds nice  |
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Post by jelosno on Mar 29, 2009 13:01:37 GMT
the milage is not the problem.
it's just that i WANT it to be in the same box. plenty of space there.
I might build a separate (PS) box within the (amp) box - maybe...
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Post by jelosno on Mar 29, 2009 13:21:22 GMT
 5x12 ;D |
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 29, 2009 13:33:47 GMT
5x12 ;D mmm more toys |
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Post by jelosno on Mar 29, 2009 14:58:32 GMT
they will withstand Godzilla. Only HEAT can destroy them and wrong wiring of course ;D the chip towers  |
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Post by jelosno on Mar 30, 2009 12:52:23 GMT
Miguel, these are 1543 stacks the 'I2S-input' boards that feed them  the SPDIF converter features a CS8414 with a 74VHC4040M (buffer I guess) on the underside the USB board a PCM 2707 (49M2JH5) with a 74HC08D (also buffer?) |
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Mar 30, 2009 13:08:09 GMT
Stefan
Well if my 8 stack 1543 is anything to go by these should be a damn nice listen ;D
Robert
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Post by jelosno on Mar 31, 2009 12:12:04 GMT
Miguel, me too It seems that today the last of my ordered components did arrive. Have to pick them up this week at the other end of town. Parts for the CDP, EAR+ and DAC So, first I have to put toghether the CDP in original form. Let this run for a while together with the EAR+HD. 1.0 - I want to listen to the DAC fed by the CDP for a while. The CDP was out of order (=in parts) for more than a year) 1.1 - Upgrade some caps in the CDP and see whether it's any good. 1.2 - Install TentClock with SPDIF out in CDP & listen 2.0 - Listen to DAC fed by one of my PCs , maybe the DT166 GEODE miniPC dtresearch.com/product/dt166/index.htm or my brandnew ASUS Aspire One that arrived yesterday. 2.1 - after some hours change some caps in the DAC and so on 3.0 - Upgrade PS of EAR+HD 3.1 - Upgrade (hopefully) other caps and resistors and TBD in EAR+HD will try some that accumulated here 4.0 - build new chassis for EAR+HD 4.1 - build chassis for DAC timeline for this: NONE, whenever there is time  |
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Apr 1, 2009 13:47:12 GMT
flashback  Ok the PCM1793 now has a case to live in and is sounding damn fine  controls are simple left to right power input select Coax, TOSLink, Aux Analog Indicator (LED) is PLL unlock Ok I'm hearing ya needs some labels, working on it  |
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Deleted
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Post by Deleted on Apr 21, 2009 6:00:04 GMT
Alex, have you tried the LM4562HA in the PCm1793 DAC? Robert Robert No, All that is on the backburner for the moment, as I have been preoccupied with drilling and making a JLH, assisting a local member etc. BTW, where do you get decent, reasonably priced PCB drills/multitool that take .8mm drill bits ? The smallest collets wear out in the el cheapos, which are now also damn hard to get locally. (some websites not updated either !) This always has been low priority for me because I already have a very good DAC in use, that this won't come close to, no matter how far it is tweaked. Another problem is it's a voltage type as well. Alex Well I have finally put together the el cheapo PCM1793 DAC. I built it in a similar case to that of my Jaycar HA, using almost identical power supply arrangements,including a JLH, except that I used a 9-0-9VAC 20VA toroidal transformer and set the output to the dual regulated PSU to +-7.5V. Like Robert, I also removed the rail splitter I.C. and used an LM4562HA, as Robert suggested. I also replaced the 1uF capacitor on the VCOM pin of the DAC with a MKT type, and as Robert stated, the change was found to be very worthwhile. Now that the electros have stabilised, the SQ is very good indeed, and certainly considerably better than the X-DAC V3 before it was extensively modified. Like Robert, I think this el cheapo DAC may give some highly respected DACs at a much higher cost, a very good run for the money. Alex |
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Apr 21, 2009 9:28:30 GMT
Alex, mmm not convinced, have a listen to Diana Krall "Boulevard of Broken Dreams" amongst others of course,..  Robert |
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Post by Deleted on Apr 21, 2009 10:17:01 GMT
Robert
Which album is that on ? Are you also using a JLH in line ?
Alex
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Apr 21, 2009 10:26:39 GMT
Alex The album All For You, other tracks "I'm through with Love" probably better (maybe best) vocal presentation or indeed the track "Do I want You" very dynamic no JLH yet still need to get some bits an pieces, but do have some fat tant's de-coupling the LM4562HA  Robert |
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Post by Deleted on Apr 24, 2009 0:28:51 GMT
Re my reply 145: Below is a photo of this little giant killer. Unfortunately, the price of the module has now increased to US$70. However, built with a JLH, and using a LM4562HA, it is far superior to my original X-DAC V3, and would give many DACs at a much higher cost than this implementation, a real run for the money.You will however, need to be reasonably experienced at removing components from double sided PCBs. Want a 2nd opinion about this little module ? Just ask RobertKD. Alex  |
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i took the board out and checked it all out for dry solder joints, all looked ok so put it back in and fired it up again worked well untill about 30 sec later then same left channel same crackling sound Grrr. swapped the op-amp out with my spare from my SCHA made no difference. 
