TDA1541A non-o/s DAC PCB

[Peter Daniel]

So the current spacing on those is 0.60"?

It is fine, but some people just might have some other caps at home and will not proceed with buying those Wimas. Like for instance, I have substantial quantity or ROE MKT caps and those would be OK here, but the spacing on them is 0.30". There is also an alternative for those in US, who want to buy Panasonic caps from DK (as they might be also good in that application) and I guess spacing on those would also be less, as they are not rated 250V.

Of course this is not a big issue, and any way will work, but it would be just more convenient to provide more options for people.

[Pedja]

Yes, 0.60” (15mm).

I somehow discarded all the MKSs (MKTs) for usage here and have looked on the possible MKPs. But I will think about this again.

Take note that, though probably not available everywhere, these WIMAs are quite cheap, Buerklin (part # 43 D 642) sells them for 0.3EUR/piece, 0.24EUR for 10 or more, which means 12 needed 0.1u caps cost 3EUR.

It would be useful if anyone can post info about the American suppliers of these.

I will change a bit my plan considering the passive parts, at least for this unit I am soldering, since I stayed without some caps I have ordered. Newark does not sell OS-CON SG anymore, so I will use BG’s NX I have at hand instead (for the receiver and TDA’s digital supplies) which will be, according to Peter’s latest findings good thing. The bad thing is that I will be shortened for more objective insight about the differences produced by the layout only.

Pedja

[Pedja]

Originally posted by Pedja
Newark does not sell OS-CON SG anymore (...)

I meant Farnell (part 664455).

[bzo]

Did a quick check, and the only large vendor I could find for those WIMA caps in the USA was Mouser. Unfortunately, they don't carry the 250V .1uf MKP10.

By the way, is the value for these decoupling caps critical? I seem to recall seeing some people using larger values for a few of the LSBs.

[Peter Daniel]

I don't think it's that critical. I was using 0.68 and it worked

[siu sin man tho]

hi,

I know that the de couple cap of the tda1541a large will use 1uf.
due to many diyer had different taste, so I design my TDA1541a PCB was fit for different size cap. The large was wima.
pls see the lay-out of my PCB. the 4 pin holes beside the TDA1541a was fit for different size & different value of the de-couple caps.

otherwise, more grounding area will better.

thanks

thomas

[jean-paul]

Mmm, now that I read the latest posts I understand some of the wishes. Normally I would use Wima MKP10 0.1 uF 160V so I won't be able to use them. But in case of a nice layout that will be worse when edited I would advise you to make this PCB an as-is offer. The caps are not that expensive and/or hard to get. BTW the best caps are big, aren't they ?

Do not edit the board in this stage to cater for anyones wishes. It will slow down things and chances are that it will be an neverending story leaving Pedja with a bad feeling. Everybody has different wishes and if you want to incorporate all those wishes the board will never be finished. It is impossible to keep everybody satisfied and you need the time for testing/measuring/debugging the DAC which seems more important. It is a bad experience to ship something and later discover it has flaws.

If people want a board they should accept what you offer at the moment or design a PCB themselves ( or hardwire ). Maybe next time it is wise to show the design in an earlier stage leaving room for suggestions.

edit: I just checked and 0.1 uF 160V MKP10 fits on the PCB, just as 0.1 uF 250V MKT and even 0.1 uF 630V MKT provided that 15 mm is the correct format. It seems bigger at the picture. 15 mm spacing is pretty standard in MKP, in many cases it'll be only MKT that is smaller ( till 5 mm spacing ).

[siu sin man tho]

hi paul,

If people want a board they should accept what you offer at the moment or design a PCB themselves ( or hardwire ).

I did not know this message U was talking to me or not.
But really, I design this PCB only like to design a good PCB to diyer.

the photos show was the back screen. U can see the de-couple cap was also shield by the grounding to lower the noise.

thisPCB is test print I added more functions which compare with the standard specification that at first posted on this forum.

1. include I2S input which was very close the CS8414 to prevent the data error during passing the message.

SYN-SCK-SDATA.

Reclocking input also reserve for my coming reclocking parts.

I was waiting for my japan friend posting lower than 30PPM crystal to me to build the reclocking parts.
Diyer can make choice use or not.

for more information, pls visit.

http://www.sakurasystems.com/

2. added one dip.switch.

for setting for different mode.

syn mode or aysyn mode.

3. I tested that the input pulse transformer is much better than use a 75ohm resister. The T1 space on the PCB at first I deside come with the RS Pulse (H.F.) 75ohm input transformer. Ratio is 1:1.
But recently I received some news & due to I had links with japan many brand audio transformers.
I received that Tamura had one new developed Pulse transformers which design for the digital interface for professional audio equipment as prescribed in EIAJ standards.
the band width is more width than RS.
Tamura from 100Khz~6MHz. Its made by Amorphopus core.
I was waiting for the sample.
If the price that japan offer to me is good. I will use into the kits.



thanks

thomas

www.diyaudioicraft.com

[jean-paul]

Hi Thomas, I was adressing to Pedja of course as this is "his" thread discussing his design. Please discuss your board in your thread as crossing the subjects will work confusing.

I don't know Tamura digital pulse transformers but I think 6 MHZ is poor compared to the established brands. The ones I use have 340 MHz bandwidth. Audiobrands like Tamura and Audio Note produce very fine transformers but I think the field of pulse transformers is better left to specialists in that area. Of course this is just my opinion which might be totally wrong.

[JonPike]

Originally posted by jean-paul
edit: I just checked and 0.1 uF 160V MKP10 fits on the PCB, just as 0.1 uF 250V MKT and even 0.1 uF 630V MKT provided that 15 mm is the correct format. It seems bigger at the picture. 15 mm spacing is pretty standard in MKP, in many cases it'll be only MKT that is smaller ( till 5 mm spacing ).

OK, you guys have already found the .1uF 160V caps.. I was going to mention here in the US, Mouser stocks them at something like $0.53 each.

We have some of these at my work.. and a high end LCR meter.. the MKP10 caps are about 1/10th the ESR of good ceramics and even polyester film caps. Polyproplyene and good design.. makes for a great cap..

So, when is this board going to be available?

Jon