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Teac Reference Line UD-501 USB DAC "DSD" - Page 25

post #361 of 368

C-media is another popular USB audio receiver chip but maybe not as much in high end audio products.

post #362 of 368

the 503 is up on the site!

http://www.teac.com/product/ud-503/

post #363 of 368

This guy has got a 503 and says there's no voltage regulation after the 4 big power supply caps.

 

http://www.post76.com/x2/forum.php?mod=viewthread&tid=218824

 

He's going to build one in.

 

That's a big disappointment.

post #364 of 368
Quote:
Originally Posted by 37mil View Post
 

This guy has got a 503 and says there's no voltage regulation after the 4 big power supply caps.

 

http://www.post76.com/x2/forum.php?mod=viewthread&tid=218824

 

Could you explain the significance of this to a relative newbie please? Thanks.....

post #365 of 368
Quote:
Originally Posted by occamsrazor View Post
 

 

Could you explain the significance of this to a relative newbie please? Thanks.....


Power is everything! Well, in audio, clean, stable power is.

 

Normally a voltage regulator is used to provide non-fluctuating and noiseless voltage.  In fact, the 501 has 4 of them for the audio circuit (2 per channel +/-12V from the 15V transformer).  This is so important that some people like to modify these 'poor performance' parts with discrete circuits from Dexa, Belleson, and now Sparkos, which provide even more stable and noiseless power.  Without the regulators, the power coming through the mains which could be fluctuating wildly could possibly affect sound quality.

 

Having NO regulation in a product of this price point is kind of ridiculous - and strange. Well, until more people get the 503 to have a look at the circuit, we'll just have to see.

post #366 of 368
Quote:
Originally Posted by 37mil View Post
 


Power is everything! Well, in audio, clean, stable power is.

 

Normally a voltage regulator is used to provide non-fluctuating and noiseless voltage.  In fact, the 501 has 4 of them for the audio circuit (2 per channel +/-12V from the 15V transformer).  This is so important that some people like to modify these 'poor performance' parts with discrete circuits from Dexa, Belleson, and now Sparkos, which provide even more stable and noiseless power.  Without the regulators, the power coming through the mains which could be fluctuating wildly could possibly affect sound quality.

 

Having NO regulation in a product of this price point is kind of ridiculous - and strange. Well, until more people get the 503 to have a look at the circuit, we'll just have to see.

 

Thanks for taking the time to explain.... If that's the case it does seem odd doesn't it? I mean Teac can't be stupid and they've obviously put a fair bit of thought into this DAC. I just wonder if it's some kind of mistake and there is actually something there to perform this function. Time will tell I guess....

post #367 of 368
Quote:
Originally Posted by occamsrazor View Post
 

 

Thanks for taking the time to explain.... If that's the case it does seem odd doesn't it? I mean Teac can't be stupid and they've obviously put a fair bit of thought into this DAC. I just wonder if it's some kind of mistake and there is actually something there to perform this function. Time will tell I guess....


The last DAC I had with no regulation was the Musical Fidelity x-dac v3 but that was well below the 503 price point.

 

I think Teac might have simplified or cost down the circuit due to price or PCB space concerns. 

post #368 of 368

The guy with the 503 linked above has removed the SO-8 package op amps and replaced with DIP sockets to roll op amps as well as changing all smd resistors in the audio path to 0.1% types.

 

The board looks so cramped even the smallest discrete op amp from Sparko won't fit.

 

There were 3 op amps per channel in the 501, all dual type.  Now there's only 2 and no mention of them being MUSES. Looks very disappointing coming from a 501.

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