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I/V stage for PCM1794/8 + tpa6120 preamp - Page 2

post #16 of 18
3/17/11 at 7:12am

You can also trim the resistors with another high-value resistor

in parallel to improve the accuracy.
 

Quote:
Originally Posted by cobaltmute View Post



 

0.5V on 10volts is only 5% error.  Not much worse that you can get out of using fixed regulators.  A 7805 can vary from 4.75-5.25V.
 

 



 

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post #17 of 18
3/17/11 at 9:16am
Thread Starter 

That's indeed what the datasheet suggests. For it to work without trimming, you'd need perfectly matched voltage references inside the lm317 and the lm337. As the reference voltage can be in between 1.2 and 1.3V, you certainly need some trimming.

 

I've got 65mm/54mm still free on my panel.. any suggestion ? An output protection kinda like the epsilon12 ?

 

panel.GIF

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post #18 of 18
3/17/11 at 10:40am

Looks like a spot for a DAC board for a PCM1798.

 

Would make a complete head-amp on a panel

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