What best value PSU for WaveIO USB=>SPDIF board - Page 2 - diyAudio
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Old 28th September 2012, 04:37 PM   #11
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Quote:
Originally Posted by hochopeper View Post
salas reg Q101 heat is dependent on full CCS, in this case I'd be designing for 550mA. Q106 heat will fluctuate with load current changes, impact of this is less. With a rough quick calc using the SSLV spreadsheet, I've just done you have ~8-9W of heat between the two to supply WaveIO. In many cases this is ok, and a price well worth paying.


Chris
Just found my mistake. I had too much voltage on input. Revising down to 11V DC out of the filter gives more like 3.5 -> 4W of heat. More manageable but still requires consideration.
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Old 30th September 2012, 08:26 PM   #12
JLOP is offline JLOP  France
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Thanks guys

Quote:
Originally Posted by Jogi View Post
I can also vote for Salas reg. ...
If possible, I would use those to power even my toothbrush
that will be the result : not HIFI but HI GLOSS

So i get a unanymous answer ! I will go for it and try to fit everything in the used TV decoder case I found in the garbage can

Just three points

- Is 9v trafo enough or should i go to 12v ?
- do i need a plug with ground ?
- Is it ok to build the circuit on perforated board or is it better to make a PCB ? The group buy looks interesting but ends far away end of october

Jean-Louis
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Old 1st October 2012, 07:10 AM   #13
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9V transformer should be enough as long as it is rated for 9V at the full current that it will see (500-600mA).


Yes you need an AC lead that includes Active, Neutral and Safety Earth connections. Safety Earth should be connected to the enclosure that you mount the regulator in.

Both perf or pcb will work, though I think the layout of the PCB gives a touch extra improvement in performance, especially for noise performance.
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Old 1st October 2012, 11:36 AM   #14
Ryssen is offline Ryssen  Sweden
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Quote:
9V transformer should be enough as long as it is rated for 9V at the full current that it will see (500-600mA).
what is the currentdraw of the wave I/O card?
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Old 1st October 2012, 02:54 PM   #15
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Quote:
Originally Posted by Ryssen View Post
what is the currentdraw of the wave I/O card?
I believe it is just a touch under 500mA at 24/192, I am not sure of the exact numbers. For lower sample rates the current requirement is less than that. So I had guessed a shunt for 550-600 gives enough headroom.

Last edited by hochopeper; 1st October 2012 at 02:59 PM.
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Old 1st October 2012, 07:18 PM   #16
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My friend measured it with NDK oscillators and it was about 320mA. Lorien told he will test it again. Maybe he will answer as Im very curious for his statement.
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Old 1st October 2012, 07:25 PM   #17
qusp is offline qusp  Australia
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what FS (sample rate) did your friend measure at? this impacts directly on the current consumption
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Old 1st October 2012, 07:41 PM   #18
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24/192 files and it was only 10-20mA more than from 16/44 files if I remember. One of users also confirmed that value in XMOS thread - exactly the same.Im still waiting for official statement from Lorien as I forgot about it)
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Old 2nd October 2012, 12:57 AM   #19
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Thanks for the info zibra, I will try measuring mine once I have a DAC connected to it again, later this month.

Maybe we should prompt Lucian again, he has revised the firmware to more accurately communicate with the computer the power required by the interface so maybe he measured it again as part of that process?
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Old 2nd October 2012, 08:35 AM   #20
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I want to run few measurements but my crap chinese-multimeters got me into some sort of trouble by supra-evaluate the power consumption of WaveIO. My initial readings were somewhere close to 470mAmps and I thought this could be closer to a real value. I didn't took it too seriously from the first place as I had few issues with measurements using cheap chinese multimeters but this one has crossed the line. Moreover, the thermal dissipation on WaveIO PCB also kept me in this error.
But thanx to Jakub's (zibra) help and persistence (quite annoying some times ) my new measurements are closest one so far to what he and other WaveIO owners have posted on diyaudio 340-380mAmps. Again, I do not trust in what I saw. I've already start looking for a decent multimeter just to have a *real* reference on measurements and avoid this awkward situations (for me) and I found Agilent OLED series but after looking at one review on youtube I remain not too convinced about it.
So, I'm in a position of asking for anyone that has a precise multimeter and a WaveIO around to post some measurements... at least until I'll find some money to buy one of my own.
I apologies for any inconvenience created by this situation,
Lucian
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