Jambo DAC - DIY USB/Optical/Coaxial DAC kit now available! - diyAudio
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Old 4th July 2008, 10:30 AM   #1
Jambo is offline Jambo  United Kingdom
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Default Jambo DAC - DIY USB/Optical/Coaxial DAC kit now available!

Hi everyone,

I've mentioned this a few times on here and those that are members of head-fi will already be aware of it... But my DAC kit is now available.

The block diagram is shown below:

Click the image to open in full size.

It has 4 inputs (USB, Coax and Optical x2). These are selected by a microcontroller talking to a WM8805 which converts SPDIF to I2S. The DACs are two WM8740s in dual mono configuration. The board also supports the WM8741 if you can get hold of some.

Output filters are built around AD797, but the opamps are socketed so you can play around with whatever single opamps you fancy.

Here's a pic of a completed board:

Click the image to open in full size.

Note that the main supply caps are taller than what comes with the kit.

The price for the kit is 85, with shipping at 4 UK, 7 Europe, 10 ROW.

Note that a power supply is required, as are switches and LEDs to change source and indicate the currently selected source. The HID switches on the PCM2706 are currently not working but I think that is a software issue.

Let me know if you have any questions.

Cheers

Jamie
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Old 4th July 2008, 07:24 PM   #2
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This is a very interesting kit indeed. What are the physical measurements of the board if I may ask (incl. height).
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Old 5th July 2008, 01:16 AM   #3
Jambo is offline Jambo  United Kingdom
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Of course... The PCB is 5.5 x 4 inches approximately and the tallest component in the kit version is the dual RCA socket which is (according to the datasheet) 26.5mm tall - meaning the complete assembly will be no more than 30mm tall.

I hope this answers your questions.
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Old 5th July 2008, 02:59 AM   #4
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Default regarding the usb input

Can it read from a thumb drive or does the
Jambo dac operate in slave mode only with
usb input?
I ask because I saw the ucontroller thought
perhaps the dac can now be used as
master and an external usb device as a
slave.
I'd like to play wav files in the usb drive thru
the dac.

tinears
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Old 5th July 2008, 11:28 AM   #5
Jambo is offline Jambo  United Kingdom
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tinears02 - I'm afraid that the USB functionality is slave only - it connects only to a PC. I did actually think about doing what you suggest using devices from FTDI but I didn't need the functionality myself and wasn't sure how popular it would be.

I also meant to mention in my first post that the kit will come with the microprocessor soldered and programmed as I can appreciate that this is a hassle for many people.
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Old 1st August 2008, 06:16 PM   #6
Jambo is offline Jambo  United Kingdom
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Hope nobody minds too much if I bump this - hoping to sell all of the kits before I move to Baku in September where I won't be able to offer as much support...
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Old 1st August 2008, 07:12 PM   #7
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Could you possibly provide a schematic, generic or specific, of the output stage? Would be interested in exploring direct-to-tube from WM8740 outputs.
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Old 2nd August 2008, 04:46 PM   #8
Jambo is offline Jambo  United Kingdom
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Hello zigzagflux, full schematics can be downloaded from the first post in the build thread which is located here: http://www.head-fi.org/forums/f6/jam...thread-344585/

It would be easy to extract the outputs directly from the DACs (prior to opamp filters) as they are all available on vias which are 0.7mm holes which can easily accept a wire. It may not look as neat as you would like, but it would work.

Any further questions let me know.
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Old 20th August 2008, 09:41 AM   #9
Jambo is offline Jambo  United Kingdom
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Just to let anyone who's thinking about it know that I will only be able to supply these for one more week, then I'm moving abroad.
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