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Old 27th November 2017, 02:13 PM   #51
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Quote:
Originally Posted by soundcheck View Post
I have been trying Meanwells and MRAVLCAs TPS7A4700 modules.
We have been testing since Friday. Of course many problems...we got ripple of 1000mV :-)
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Old 27th November 2017, 02:25 PM   #52
TNT is offline TNT  Sweden
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Quote:
Originally Posted by henrylarsen View Post
Will be looking forward to that. In the meantime, to go back to Soundchecks original question. Soekris is using Mean Well supply in his dac.
http://www.soekris.dk/images/dac1541_open_1200.jpg
Any comments to his solution?
Does this give any ideas to how the Mean Well could be "tamed"?
It surely measure fantastic.

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Old 29th November 2017, 03:27 PM   #53
soundcheck is offline soundcheck  Germany
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Quote:
Originally Posted by cdsgames View Post
We have been testing since Friday. Of course many problems...we got ripple of 1000mV :-)
1000mV = 1V out of 5V !?!?

Wow. You (or your supplier) managed to build the worst supply ever.


I was actually hoping to play around with one of your devices before Christmas.

Christmas 2017...

Let see how things are developing.
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Old 5th December 2017, 04:01 PM   #54
cdsgames is offline cdsgames  Canada
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Down to 5mV...before the active noise filter . Still we need to get it down to 2mV. Its not easy..

From 2mV the active filter takes it down to 4uV (0-100Khz)
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Old 5th December 2017, 04:06 PM   #55
soundcheck is offline soundcheck  Germany
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I didn't expect anything different from you guys.
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Old 12th December 2017, 12:23 PM   #56
cdsgames is offline cdsgames  Canada
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Taming the beast.. different values for RC snubbers to quiet the emi and noise/ripple of the last diode (output side)

There is a significant difference between 1nf and 20nf *and much more whiteout any RC snubber)
Attached Files
File Type: pdf C121nF (002).pdf (143.8 KB, 89 views)
File Type: pdf C1220nF (002).pdf (136.0 KB, 69 views)
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Old 28th December 2017, 11:42 AM   #57
cdsgames is offline cdsgames  Canada
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0-100Khz 275uV
1Mhz 875 uV at 3A

Last design of the PCB has started , we hope to decrease further
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Old 28th December 2017, 12:22 PM   #58
soundcheck is offline soundcheck  Germany
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Once your're done with the finetuning and related measurements...
...don't forget to run listening tests!


While we're at it...

We already discussed that future Allo HATs should all have the same powering scheme (jacks and jumpers to disconnect power rails from lower and upper boards). Meaning. The user should be able to easily attach a single 5V supply to a complete tower or power a group of boards (e.g. Kali and DAC) or power each board separately.

Obviously the target behind it is primarily to achieve a little better performance and not boosting your product sales. (This would be a nice side-effect from your perspective though )

Enjoy.
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Old 29th December 2017, 03:09 PM   #59
cdsgames is offline cdsgames  Canada
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Are you sure that 1uV of IFI is only ripple and no SW frequency and mains ? Today we have reached 220uV 0-100Khz (switching noise included) and 600 uV at 1Mhz (2.5A tested)

Check new Boss v1.2..
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Old 1st January 2018, 10:49 AM   #60
basreflex is offline basreflex  Spain
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there are varous design choices related to the switching frequency vs the audio clock frequencies used in the system. one is to use a fixed dcdc frequency, like possible in the zvs resonant design, giving up some input range (although there are 3phasic options to combat that) and burn away some heat linearly to adapt to input voltage variations.
the fixed frequency can be set to lay either outside the audioband of interest, the harmonics will at some point conincide with clock harmonics. the next option is to sync the dcdc freq to a multiple of the audio word clock , for example 192kHz or 384khz .

the resonant designs have a considerably lower common mode noise due to weaker coupling between secondary and primary. and that is the noise that enters into the system, not the nosie across the terminal..
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