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DAC-ASH (dac-end 2 up date)

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#401
Hi,

I see nothing wrong there, pin 3 of 74H is ground, ok, it´s a little bit complicated to see, my board isn´t still populated, there it´s more easy.

I´ve received my trany 6x9V from Bud/Onetics yesterday, 2 month of shipping, what impressive iron!!!!!!

Klaus
 
#403
Before I send this off to my friend in Canada, thanks again Strosek! I wanted to try one more thing. I chatted with Andrea this morning and he said I could hook up a speaker driver to the output I/V with a 2uF cap. I assume he means a film cap. I don't have a film cap in that value but I have one that is 10uF. That should be ok right?
 
#405
Let us know when its up and running!

As I dream about it coming back working I have a question regarding hi-rez music. The receiver chip is a 14 bit chip. Can it be replaced with a CS8416? Will that allow higher resolution files to be played? Or it is a fact of the Dac chip itself?
 
#410
IT WORKS

Well sort of and not for long .
I switch it on led goes out ,half a second of chatter then 80% interference 20% music after about 25 sec music gets less until i can hardly hear music for interference.
I have no idea how to rectify been working on this for a week or more ,getting tired of it ! cheers
 
#414
Yomanze: Have been getting the parts together for this DAC & having looked at the layout I think it is worth hardwiring the CS8412/4 loopfilter caps in a 'v' shape between pins 20 and 21. Anyone tried this?

Quanghao: You want say the layout have problem???
Thanks
Click to expand...

Hi Quanghao,

Only just saw your reply. Extremely short lead/trace lengths are very important here. Please see the CS8416 datasheet:

"For minimum PLL jitter, return the ground end of the filter network directly to AGND." and:

"The type of capacitors used for the PLL filter can have a significant effect on receiver performance. Large
or exotic film capacitors are not necessary as their leads and the required longer circuit board traces add
undesirable inductance to the circuit."

http://www.cirrus.com/cn/pubs/proDatasheet/CS8416_F3.pdf

Although the loop filter for the CS8416 is different there's loads of great info from page 53 onwards including layout examples.

Best regards,

Neil
 
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#418
quanghao said:
No!
Only Cs8414, you can not use Cs8412!
If you like Cs8412 you have to change cricuit folow Adionot DAC!
Thanks
Click to expand...

Hi Quanghao, have looked at both circuits & CS8412 does appear to be pin-compatible, so it should work. Only differences I could see are use of an LED + resistor (pin 28) in the DAC ASH circuit (which I'm not using) and use of cc/f0 (pin 23) for input switching on the Audio Note DAC. Unless I am missing something?!
 
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