A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 38 - diyAudio
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Old 21st May 2013, 08:21 PM   #371
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Hi Doede,

will the change from 3,3v to 5v for the supply of the motherboard also benefit when using 4 boards?
How much current will the motherboard draw?

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Old 21st May 2013, 09:00 PM   #372
dddac is offline dddac  Germany
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Not sure if it will be that audible... of course you can run any nr of boards with the 5 volt supply. supply current for the main board is roughly 110 - 130 mA, depending on the sample frequency and nr of LEDs "on"

I made my test board now with a red LED between common and GND ( parallel 1 uF ) and make it selectable with a switch. no time to seriously listen so far....
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Old 23rd May 2013, 03:07 AM   #373
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very good work,

I understand how to bypass internal filter, but it only accept 24 bits right justified format, if I only have 16 bits data, can tell me how to config pcm1794 so it can accept 16 bits data, read from pcm1792 datasheet, it is very clear, we can bypass internal filter and choose 16 bits 20 bits and 24 bits
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Old 23rd May 2013, 07:42 PM   #374
dddac is offline dddac  Germany
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Quote:
Originally Posted by maxwang View Post
very good work,

I understand how to bypass internal filter, but it only accept 24 bits right justified format, if I only have 16 bits data, can tell me how to config pcm1794 so it can accept 16 bits data, read from pcm1792 datasheet, it is very clear, we can bypass internal filter and choose 16 bits 20 bits and 24 bits
16 bits data or 24 bit data does not matter. wat matters is that you adapt to the dac chip set up. in This case 24 bit, so you know how many clockcycles you need to delay... for the circuit, see my website, it is all there..
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Old 1st June 2013, 11:25 PM   #375
dddac is offline dddac  Germany
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Default LCD panel for WaveIO

Just for fun, I worked out a LCD message indicator for the WaveIO Board. It can be used with the DDDAC, but of course with any other WaveIO as well...

It is based on an Arduino UNO and 16x2 dot matrix display.
You can find it all on my Website under "other projects" (code included)
click here to go the LCD Project page

and... here are a few teasure pictures
Attached Images
File Type: jpg DDDAC1794 LCD 01.JPG (476.0 KB, 817 views)
File Type: jpg DDDAC1794 LCD 04.JPG (670.3 KB, 795 views)
File Type: jpg DDDAC1794 LCD 17.JPG (257.9 KB, 769 views)
File Type: jpg DDDAC1794 LCD 05.JPG (297.5 KB, 754 views)
File Type: jpg DDDAC1794 LCD 09.JPG (197.4 KB, 731 views)
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Old 2nd June 2013, 08:38 AM   #376
IanS1 is offline IanS1  United Kingdom
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Very nice... good work Doede.
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Old 2nd June 2013, 02:56 PM   #377
Almeg69 is offline Almeg69  United Kingdom
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Uh Oh ! I have a calling telling me to get 4 more Dac boards. I must resist. I must resist.
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Old 2nd June 2013, 03:26 PM   #378
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Quote:
Originally Posted by Almeg69 View Post
Uh Oh ! I have a calling telling me to get 4 more Dac boards. I must resist. I must resist.
You shall not resist! Such a thing will only get worse. You shall have nightmares about it, stop eating and your thirst for DIY will grow even bigger!

Do.
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Old 2nd June 2013, 05:55 PM   #379
Almeg69 is offline Almeg69  United Kingdom
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I cannot resist any longer, I will order some more boards later in the week.

Would it be better also to get another mother board with the 5v regulator.

Will i need a more powerful 12v power supply to run them.

The IV resistors will be 16.75 Ohm, and I guess I will need the Sowter 3575`s with the OCC wire.

I will need a taller case as well .....
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Old 2nd June 2013, 07:05 PM   #380
dddac is offline dddac  Germany
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Quote:
Originally Posted by Almeg69 View Post
I cannot resist any longer, I will order some more boards later in the week.

Would it be better also to get another mother board with the 5v regulator.

Will i need a more powerful 12v power supply to run them.

The IV resistors will be 16.75 Ohm, and I guess I will need the Sowter 3575`s with the OCC wire.

I will need a taller case as well .....
Look forward to your order

I can send for free the 5 Volt Regulator with the boards, so you can change it against the 3V3 one...

If you have the dddac power supply (12V) it can feed 8 boards without any Problem...

A taller case, yes, can't help
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