[Marcus_C]

Quote:

Whatever happened to the Y in DIY?  Why is everything just buying a board from someone and soldering some parts down? It's my design.
 

Yeah, Sorry, didn't mean to take anything away from you but I was looking for either designs or pcb's. I don't consider myself a total newb, but my circuit design experience/skill is pretty much limited to a flashing bike light I did a few weeks ago. Nelson Pass designs look like a good compromise without having to learn another branch of engineering.
 
edit: Plus it looks like a professional Job, Kudos for that.

 

[regal]

 
Ask him if he designed without SPICE software as a true DIYer would!
 
Quote:

Yeah, Sorry, didn't mean to take anything away from you but I was looking for either designs or pcb's. I don't consider myself a total newb, but my circuit design experience/skill is pretty much limited to a flashing bike light I did a few weeks ago. Nelson Pass designs look like a good compromise without having to learn another branch of engineering.
 
edit: Plus it looks like a professional Job, Kudos for that.

 

[dsavitsk]

Quote:

 
Ask him if he designed without SPICE software as a true DIYer would!
 

regal - I don't know what that means? The circuit was designed on paper, and initial testing was done on breadboard, but we did run it through a simulator to be sure that nothing unpredicted was going on.

 

[gilles44]

Hi
 
How does the Opus dac sound compared to the Analogmetric Os dac(tda1541a and saa7220) ?
 
Looking for a better one than my diy dac (ecdesign at diyaudio) 4 X direct interpolation TDA1541A.
 
Thank
 
Cheer
 
Gilles

 

[atsukita]

My OPUS DAC portable

 

 

[francisdemarte]

Nice how long do the batteries last? How are they charged?

 

[atsukita]

Quote:

Nice how long do the batteries last? How are they charged?

Roughly 6 - 7 hours with 1000mAh Li-Po battery.
 
I am using (external) Li-Po battery charger. (for Radio-Controlled Car)
To add battery charging circuit, LTC4070 seems good and easy...

 

[32y0]

I don't know if this have been covered before, but I was wondering if the output caps on the opus can be bypassed (like with the previous ballsie) when using the ballsie lite.

 

[Rumble_Pak]

I can't seem to get the volumite to work with the opus, even after trying the configurations mentioned throughout this thread. Can anyone perhaps be super specific about their configuration with the volumite, such as the switches on the opus, and the exact wiring of the volumite?

 

[qusp]

did you buy the opus version of the volumite firmware?

 

[Rumble_Pak]

Yes, i did.

 

[Rumble_Pak]

I should probably mention i am somewhat confused about what i should do with PB3 and PB1.

 

[lag0a]

Does the Opus DAC Spdif Transceiver need a pulse transformer if you have no ground loop problem? I am wondering if it would make the sound quality better. If so would it be best to use one at the coaxial output of the transport using a computer or after the coaxial input of the DAC near the Spdif Transceiver?

 

[qusp]

ground isolation is only one of the benefits of the spdif transformer, the other is impedance matching. i would recommend if you can only have one, to use it on the receiver side.
 
Rumble pak: i'm not surprised you are confused with what to do with pb3 etc, i went over to tp to check it out for you, but the only place they are mentioned on the site is in the volumite for buffalo manual and only to say that they arent used. so one would presume that they are used for the opus dac, but its not mentioned anywhere and there is no volumite for opus manual, or even a general volumite manual. looks like a gap in the documentation; have you posted this problem on the tp support forums? i suspect its covered in the wm8740/1 manual/datasheet, but sorry i dont have the time to check it out at the moment.
 
i use it on buffalo 2 and they arent used, so cant be of much help there.

 

[atsukita]

Quote:

I can't seem to get the volumite to work with the opus, even after trying the configurations mentioned throughout this thread. Can anyone perhaps be super specific about their configuration with the volumite, such as the switches on the opus, and the exact wiring of the volumite?

My  Volumite wiring.
 
OPUS controller terminal                  Volumite terminal
G                                                    GND
SDIN                                               SDA
SCK                                                SCL
                                                       PB1  --------  GND (jump)
                                                       PB3  --------  GND (jump)
                                                       VCC  --------  DC supply