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Old 21st December 2005, 05:23 PM   #1
ray_ben is offline ray_ben  Hong Kong
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Default Problem in reclocking CS8414+TDA1543 DAC

Hi,

I made a DAC by CS8414 +8xTDA1543. It works well with the internal clock. However, when I apply an external clock (11.2896Mhz) and step down by the H4040, the DAC is working for about 10sec from power on but then no music out and giving "saaa saaa" noise only. Anyone know what's the problem?

Thanks for help.

regards, Ray
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Old 21st December 2005, 07:02 PM   #2
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1. Ripple counters are bad, m'kay
2. How exactly are you 'reclocking' ?
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Old 21st December 2005, 08:24 PM   #3
dddac is offline dddac  Germany
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if you have built it according to my design (see my website and download the circuit dddac1543ver22.pdf) you should have no problems...... this has been built by DIY's all over the world with great succes.

the statement on ripplecounters is far to general to make real sense. The results with reclocking speaks for it self
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Old 21st December 2005, 10:40 PM   #4
guido is offline guido  Netherlands
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Default Re: Problem in reclocking CS8414+TDA1543 DAC

Quote:
Originally posted by ray_ben
Hi,

I made a DAC by CS8414 +8xTDA1543. It works well with the internal clock. However, when I apply an external clock (11.2896Mhz) and step down by the H4040, the DAC is working for about 10sec from power on but then no music out and giving "saaa saaa" noise only. Anyone know what's the problem?

Thanks for help.

regards, Ray
H4040 as in HEF4040, the old cmos stuff ?? Check the datasheet, 11MHz might be too much for it Use a 74HC4040.

As for using that jittery divider after a not so jittery tent clock. I agree, think reclocking with the original 11MHz would be an improvement (it's on my list for my own dac).
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Old 22nd December 2005, 02:47 AM   #5
ray_ben is offline ray_ben  Hong Kong
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Sorry, it should be HC4040. And it tried HCT4040 as well. Both still failed.

regards, Ray
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Old 22nd December 2005, 02:47 AM   #6
ray_ben is offline ray_ben  Hong Kong
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Hello dddac,

my clocking circuit is like yours :>.
Could the reason be the oscillator? How accurate it required? Since the one I got is only 50ppm!!

regards, Ray
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Old 22nd December 2005, 05:30 AM   #7
Jay is offline Jay  Indonesia
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Default I gave up similar problem

I also used CS8414 and TDA1543. Reclock after CS8414 with 74VHC74 and 25MHz crystal. Only the data is clocked with reference clock (MCK of CS8414). This setup ran for almost a week without problem. Then I pulled the 25MHz (soldered) and replaced with 33MHz. No sound. Then I put back the 25MHz and came the problem. Played music for a few minutes then buzzzz...

I tried my other crystals, the problem persisted. So I gave up and just used master clock.

Hope I can learn and fix mine from this thread...
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Old 22nd December 2005, 06:27 AM   #8
dddac is offline dddac  Germany
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Quote:
Originally posted by ray_ben
Hello dddac,

my clocking circuit is like yours :>.
Could the reason be the oscillator? How accurate it required? Since the one I got is only 50ppm!!

regards, Ray
has nothing to do with it. It is asynchrone reclocking. You can actually every frequency in it. It will always work. I tried 12, 18 and 24 Mhz for fun. though the closer you stay to the original frew, the better it is
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Old 22nd December 2005, 06:46 AM   #9
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Quote:
Originally posted by dddac

It is asynchrone reclocking.
Not when the CS841x is in slave mode

Quote:

It will always work.
Apparently not.
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Old 22nd December 2005, 06:48 AM   #10
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Default Re: Problem in reclocking CS8414+TDA1543 DAC

Quote:
Originally posted by ray_ben
Hi,

I made a DAC by CS8414 +8xTDA1543. It works well with the internal clock. However, when I apply an external clock (11.2896Mhz) and step down by the H4040, the DAC is working for about 10sec from power on but then no music out and giving "saaa saaa" noise only. Anyone know what's the problem?

Thanks for help.

regards, Ray

Have you tried it with just one TDA1543 ?
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