Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: What's next?

Posted by Dave I on July 25, 2000 at 12:21:30

In Reply to: Re: What's next? posted by tenor39 on July 25, 2000 at 11:47:31:

A good transformer input will work well but some cheaper implementations do not. I would never buffer the S/PDIF input either because all the timing variation on the data edges which becomes jitter on the PLL extracted clock will be introduced into the system at this point. Some designs do it to square up the edges for the receiver but it seems redundant to me as the CS8412/14 has a built in receiver circuit with hysteresis. It also has some internal input termination so one can experiment with different (or even no) external terminations without problem.

The relay I used simply shorted out the resistor which was in series with the big cap leaving the big cap and little cap in parallel with no series resistor (or small value resistor depending on implementation). The CS8414 will lock much quicker due to its wider frequency coverage (which also leads to less jitter rejection). If you have installed pins in the board (highly recommended) you can experiment by just plugging in different combinations of cap and resistor to decide what the best values are for you.

Panasonic HFQs are one of the worst sounding electrolytic capacitors I have ever tested and I wouldn't use them anywhere close to an analog circuit or power supply but opinions do vary :-) Many seem to like them but in direct plug-in testing against many other older and less minituarized types they sound very hard and brittle with very pronounced glare. Wrapping them with lead helps immensely but other types respond much better to treatments. Just my opinion though so if you love them don't be offended.

We have probably gone on enough here and it doesn't appear anyone else is interested so why don't you e-mail me and we can talk more if desired.

Dave

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