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Old 25th April 2016, 03:18 AM   #1
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Default DIY DAC

Hi,

I am pretty new to diy electronics. Recently bought a DAC board from ebay. Obviously I didnt think it through to buy the power supply transformer. It requires a 15v-0-15v and 0-9v transformer. Found one on ebay (115V 230V 30W High Quality Audio R Core Transformer 15V 15V 9V 9V for Preamp | eBay). I have a lot of questions and I am sure you guys could be of great help here.

1. Not sure about the wiring aspects. which wire from this transformer goes where ?
2. Any idea what exactly is that ( circled in red ) on pic 1613 it says XMOS.
3. Is it worth using an enclosure ? I was planning to, but as I look at the board, the LEDs are all built into the board. If i were to do an enclosure, I want the LED indicators on the front pannel ( for eg. coax, usb, toslink etc ).
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File Type: jpg IMG_1614.JPG (148.9 KB, 448 views)
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Old 25th April 2016, 03:25 AM   #2
kevinkr is offline kevinkr  United States
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I've relocated to Digital Line Level as the device is a dac and someone here may be familiar with it. (This is where dac projects go)

As as aside you might want to post a picture of the transformer and any documentation that came with it.
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Old 25th April 2016, 04:54 PM   #3
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Thanks. Attached is the pic of the transformer. After reading further I think I need to do the following combination

15v-0-15v : YEL - YEL+BRWN - YEL
9v : BLUE - BLUE

Then keep the WHITE away.

Any idea how and which wire to ground ? is that the BLACK ?

Thanks for the help in advance
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Old 27th April 2016, 07:50 AM   #4
ozcal is offline ozcal  Australia
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Quote:
Originally Posted by rsthomas View Post
Thanks. Attached is the pic of the transformer. After reading further I think I need to do the following combination

15v-0-15v : YEL - YEL+BRWN - YEL
9v : BLUE - BLUE

Then keep the WHITE away.

Any idea how and which wire to ground ? is that the BLACK ?

Thanks for the help in advance
yellow /green is ground : connect to earth on mains recepticle
Black and green are AC, if your country is 115v mains supply , Black and red if your country is 230v.
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Old 27th April 2016, 08:03 AM   #5
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Go have a reading: Multiple Winding Transformer and Multicoil Transformers

Last edited by Groundloops; 27th April 2016 at 08:04 AM. Reason: typo
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Old 27th April 2016, 08:30 AM   #6
ozcal is offline ozcal  Australia
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Quote:
Originally Posted by rsthomas View Post
Thanks. Attached is the pic of the transformer. After reading further I think I need to do the following combination

15v-0-15v : YEL - YEL+BRWN - YEL
9v : BLUE - BLUE

Then keep the WHITE away.

Any idea how and which wire to ground ? is that the BLACK ?

Thanks for the help in advance
15-0-15 should be Y- Y+B -B . Test with multimeter connected to single Y AND SINGLE B you should read 30v if you get 0v change the Y and B that are connected together.
Follow Groundloops suggested reading to get safe understanding of what you are doing : always very wise when playing with mains voltages.
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Old 28th April 2016, 02:53 AM   #7
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Thanks ozcal. This is really helpful. I have another question. Do you know what kinda terminal circled in RED ? and how would I use that ?
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Old 28th April 2016, 03:59 AM   #8
Mobin is offline Mobin  United States
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It's for a module. In order to use usb intput you will have to buy one.
New Asynchronous Xmos U8 USB Module Compatible for AK4399 DAC ES9018 7pin | eBay
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Old 2nd May 2016, 10:38 AM   #9
02GF74 is offline 02GF74  United Kingdom
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Quote:
Originally Posted by rsthomas View Post
Hi,

3. Is it worth using an enclosure ? I was planning to, but as I look at the board, the LEDs are all built into the board. If i were to do an enclosure, I want the LED indicators on the front pannel ( for eg. coax, usb, toslink etc ).
I would put the board and transformer in a box.
You would need to remove the LEDs and solder two wires to a LED on a panel, you can buy chassis mounting LEDs.

The plastic resin has a small flat to indicate polarity so you should wire them the same way, otherwise if the LEDS does not light up, just swap the wires round - there is 50/50 change of wiring it up correctly by guessing, and you won't damage LED if you got it wrong the first time.
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Old 2nd May 2016, 03:18 PM   #10
DF96 is offline DF96  England
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Make and use a lamp limiter. Ensure you know how to safely wire DPDT main switches, fuses etc.
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