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Carrie USB-Powered Headphone Amplifier - Page 59

post #871 of 877

Still untested, as my computer can't host the GrubDAC. Is it safe, for testing purposes, to power it from the 5 V rail of an ATX PSU, and sending it audio signal from my desktop DAC?

 

 

 

post #872 of 877

Have you guys been able to contact joneeboi yet?

I saw him a few weeks ago and I'd be happy to pass along a message or point him to this thread.  

He's been very busy with life but mentioned that he'd like to get back into this if/when time permits.

post #873 of 877
Quote:
Originally Posted by KimLaroux View Post
 

Still untested, as my computer can't host the GrubDAC. Is it safe, for testing purposes, to power it from the 5 V rail of an ATX PSU, and sending it audio signal from my desktop DAC?

 

 

 


Very nice work, Kim!  It's great to see that PCB being put to use!

 

I wish the news was better on the GrubDAC.  I'm afraid you are unique in that regard - haven't had any other reports of incompatibility.  I forget the specific issue - do you think one of our new DoodleBugs could correct the problem?

post #874 of 877
Quote:
Originally Posted by tomb View Post
 


Very nice work, Kim!  It's great to see that PCB being put to use!

 

I wish the news was better on the GrubDAC.  I'm afraid you are unique in that regard - haven't had any other reports of incompatibility.  I forget the specific issue - do you think one of our new DoodleBugs could correct the problem?

 

Thank you for the kind words and for giving me the opportunity to tackle this project. 

 

I can't tell if the DoodleBug would help, as the problem seems to be with my computer. Fooling around with other USB devices, I was able to reproduce the problem, though not permanently as with the GrubDAC. 

 

I have noticed an improvement when using a short usb cable, containing a ferrite, soldered directly to the board. My goal is to assemble the unit and encase it, then try a very short, high quality USB cable containing at least one ferrite bead. I got my fingers crossed on that one.

post #875 of 877
Quote:
Originally Posted by KimLaroux View Post

 

I can't tell if the DoodleBug would help,

 

Can you measure the voltage at the DAC when plugged into the laptop?

I might be able to loan you my Doodlebug to test with...

post #876 of 877
Quote:
Originally Posted by Avro_Arrow View Post
 

 

Can you measure the voltage at the DAC when plugged into the laptop?

I might be able to loan you my Doodlebug to test with...

 

Can you be more specific? Where/what do you want me to measure?

post #877 of 877
Quote:
Originally Posted by KimLaroux View Post
 

 

Can you be more specific? Where/what do you want me to measure?


On the GrubDAC, measure between the 0V and 5V where the USB Cable would be soldered.

If the voltage comes out less than 4.75, the malfunction could be voltage related.

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