[Kenny12]

wow, thats quite a fast project

nicely done i must say

how did u etch that board?

 

[MWP]

When i get stuck into a project, it gets done quick

Although, i have probably spent ~20hrs on this from design to being built.
A good majority of that was on the PCB routing... it was rather difficult.

The PCB was made by doing the following:
- Print the PCB design onto bubble-jet printer transparencies using a bubblejet printer (it is accurate enough to make 10mil tracks/gaps!).
- Expose the Kingsten doublesided pre-coated PCB using the transparencies under a desk fluro for 12mins per side.
- Develop in the appropriate solution.
- Etch as per normal (i use ammonium persulphate).

The schematic/pcb was designed in Protel DXP 2004.
Not sure if that can export Eagle files.
I need to fix up the design and re-route a bit of the PCB before trying though.
As you can see from the photo above, i got the routing around the PCM2707 horribly wrong

 

[MWP]

All done

 

[Nisbeth]

Fantastic!

/U.

 

[saab]

nice work. I take it you soldered the USB cable directly to the board. How does the sound compare to local favorites? (that you may have listened to)

Again, it looks awesome!
-John

 

[guzzler]

Lovely job. I'm guessing those large boards underneath yours are the the switching supplies (IC1 & IC6)? Like the hacked PCM2707 as well

 

[MWP]

Quote:

Originally Posted by saab nice work. I take it you soldered the USB cable directly to the board. How does the sound compare to local favorites? (that you may have listened to)

Yup, the USB cable is soldered to the board.
No real need for a socket and separate USB cable.

I actually haven't listened to many other popular DIY amps.
The only decent things i have to compare it against ATM is a tweaked SantaCruz soundcard and an old PCM1730 DAC + class-A mosfet headphone amp i built a while back.

This little black box beats both of them very easily

Quote:

Originally Posted by guzzler Lovely job. I'm guessing those large boards underneath yours are the the switching supplies (IC1 & IC6)? Like the hacked PCM2707 as well

Yes, the large (they look large but they are only 40x40mm each... shows how small this amp is) are the TI switching supplies.

The PCM2707 is a bit of an eyesore due to the wrong design, but really, who cares how it looks inside

 

[meluko]

Re-opening this thread 3 years later

I am looking for the schematic of this DAC or at least the reference of the TI power block.

I have tried to contact MWP but without success.

I hope someone can shed some light here.

Regards

 

[DaKi][er]

Quote:

Originally Posted by meluko /img/forum/go_quote.gif Re-opening this thread 3 years later I am looking for the schematic of this DAC or at least the reference of the TI power block. I have tried to contact MWP but without success. I hope someone can shed some light here. Regards

MWP's Audio DAC-3

 

[meluko]

Thanks but this not the schematic of the USB dac.

I am also looking for the part number of the little TI power supply mounted on the PCB.

Regards