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Can a USB powered DAC, headphone amplifier, etc. filter out power supply noise from the USB line? - Page 2

post #16 of 17
Thread Starter 
Quote:
Originally Posted by tomb View Post
Also, switching power supplies can sometimes be used with amplifiers (including headphone amplifiers) with good success.  However, every amplifier circuit has a calculated property known as PSRR - Power Supply Rejection Ratio.  It's a measure of how much noise in a power supply will affect the amplifier circuit itself.  Good circuits have very high PSRR's.  However, powering a source such as a DAC does not qualify.  Once noise is introduced, it'll propagate throughout the signal stream.
 
I am finding that people on these forums are replacing operational amplifiers with better ones to improve the PSRR they specification by not finding a way of searching for commercially built headphone amplifier with high PSRR specifications Ready to go.
 
I am wondering if anybody has a list of operational amplifiers with particularly good PSRR specifications. The only thing I can think to do improve my searching successfully for headphone amplifiers with good PSRR to search by IC chip, but by do not know if that will work successfully.
 

 I like the philosophy of those people at HiFimeDIY Who believe in good value in their products with simple enclosures or no enclosures at all and few bells and whistles. A very simply enclose headphone amplifier or even when I have to enclose myself would suit me just fine if it was a very good value. I will not need many bells and whistles for I plan to use this headphone amplifier only with my desktop computer and do not mind needing to do all the controlling of it from there.


Edited by bbmiller - 2/3/14 at 6:27pm
post #17 of 17
Thread Starter 
Quote:
Originally Posted by tomb View Post

The iFi device is a linear-regulated supply, but it's extremely expensive.

So in accordance with the quote I just quoted above should I not believe this link on Amazon? From Amazon.com Wall Adapter Transformer Regulated Linear 5 Volt DC 1 Amp<br>2.1 x 5.5mm F2 Black 6 Feet UL-CSA They charge you more for shipping the new unit itself but even so is a believable? It seems to me that if we were only talking providing power for DAC and not an amplifier that current rating should be more than enough.

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