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-   -   Autoranger for soundcards (http://www.diyaudio.com/forums/equipment-and-tools/299635-autoranger-soundcards.html)

hochopeper 30th August 2016 05:35 AM

Autoranger for soundcards
 
:cop:

Thread edited to keep chronological order of moved posts.

Introductory note from Jan carried forward from old thread.

Quote:

Originally Posted by jan.didden (http://www.diyaudio.com/forums/equipment-and-tools/299635-autoranger-soundcards-post4893938.html#post4893938)
Since I started my design for an autoranging attenuator/amplifier I have been posting in other threads sometimes hijacking them. So I asked the mods to collect those posts in a new thread here.

Comments invited.

Jan

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Quote:

Originally Posted by anatech (http://www.diyaudio.com/forums/equipment-and-tools/231401-quantasylum-qa400-qa401-post4815599.html#post4815599)
Hi hochopeper,
If it's a 100 KHz source you need, an LC circuit could make an effective filter to hang after a crude sine wave source. Any of the HP oscillators like the 3336B or 3325A or B would serve quite well. Digital frequency accuracy, digital level stability. The L-C filter network would really do a number on distortion products.

Any of the XR2206 type circuits could also be used with a drop in stability, but still probably better than you need.

-Chris


Hi anatech,


XR2206 looks like the go, thanks! It's times like this that I regret not buying the -S model when I bought my Rigol scope.

Quote:

Originally Posted by jan.didden (http://www.diyaudio.com/forums/equipment-and-tools/231401-quantasylum-qa400-qa401-post4805390.html#post4805390)
Another milestone in the development of the autoranger!
Finalised and tested the cal procedure.
Especially calibrating the freq response for 0.1dB flatness out to 100kHz is a challenge if you don't have a fully equipped lab :o

I now have a procedure that needs only an AC DMM with reasonable performance and a signal generator that can output 10kHz and 100kHz, preferably up to 10V or more but that's not critical.

The procedure directs you to do some measurements and enter values in a small spreadsheet and the spreadsheet then tells you what to adjust (cap trimmer) for which DMM indication.
For -20dB and -40dB settting, in both SE and BAL mode.

It's done faster than described!

Jan

Jan,

In your note above you mention a source that can provide 10kHz, 100kHz at ~ 10V ideally for calibration. The cheapo XR2206 kits seem to be set for 2V sine wave output. The datasheet has mention of changing a resistor and increase supply voltage to 25V to get more voltage out so no worries there. I don't want this thing to cost any more ($$ or time) than it needs to, should I care about the 2.5% distortion for this purpose? Or should I look for something a bit more sophisticated?



Regards,
Chris

jan.didden 30th August 2016 07:48 AM

The calibration for the autoranger can also be done with, say, 50kHz with probably same results - it's only an octave lower.
Lower level than 10V works also well, if you have a good RMS multimeter that works down to say 20mV.
The procedure is universal, and the measurements are comparatively, not absolute.
Source distortion is no issue.

I wouldn't start buying test equipment for this yet!

Jan

jan.didden 30th August 2016 08:29 AM

Quote:

Originally Posted by Stefanoo (http://www.diyaudio.com/forums/equipment-and-tools/231401-quantasylum-qa400-qa401-post4815046.html#post4815046)
when do you think the kit will be available for purchase and what is the asking price? Any ideas yet?

I have been looking at a kit consisting of:

- Painted and labelled enclosure;

- Complete assembled and tested SilentSwitcher power supply;

- Attenuator/amplifier PCB;

- Control PCB;

- Programmed controller.

and that would probably come close to 150.

Jan

MarkS 30th August 2016 09:08 AM

Quote:

Originally Posted by jan.didden (http://www.diyaudio.com/forums/equipment-and-tools/299635-autoranger-soundcards-post4815729.html#post4815729)
...that would probably come close to 150.

I'm fine with that price, so have your first order...

jan.didden 30th August 2016 09:20 AM

Yes but that is with minimum orders of 50 for everything except the controller ;-)

Maybe do a Kickstarter?
Then I can include some turn-key sets too for those who don't want to do the soldering etc.

I don't want to make money but I also don't want to get stuck with $ 2000 worth of shiny boxes...

Jan

MarkS 30th August 2016 12:31 PM

Quote:

Originally Posted by SyncTronX (http://www.diyaudio.com/forums/equipment-and-tools/231401-quantasylum-qa400-qa401-post4815903.html#post4815903)
Maybe a board that 90 - 95 percent or more SMD completed with maybe 10 to 5 percent through hole.

As far as I can ascertain the board layout and parts list are complete to achieve the design specifications so, imho, it would be unfair to expect Jan to start redesigning anything at this point in time...

jan.didden 30th August 2016 03:02 PM

Quote:

Originally Posted by MarkS (http://www.diyaudio.com/forums/equipment-and-tools/299635-autoranger-soundcards-post4815910.html#post4815910)
As far as I can ascertain the board layout and parts list are complete to achieve the design specifications so, imho, it would be unfair to expect Jan to start redesigning anything at this point in time...

Yes that is correct. Just today talked to the outfit that did the enclosure prototype about getting a bunch made. You know, like drop the display window 0.5mm, raise the switch hole 1mm and decrease diameter 0.2mm, that sort of thing :cool:

Now I have to decide if I want to commit a couple of grand to get it going.

If any of you have plans (or make any after reading this ;)) of visiting RMAF this fall, I'll have a fully operational prototype to check out.

Jan

mroether 30th August 2016 03:18 PM

Hi Jan,

sorry for a couple of questions:-)

Have you had the chance to take some photos of the PCBs?
Is there any chance to share the schematics of the AutoRanger with us?
What are the costs (approx.) for the components needed for the full kit?

Michael

MarkS 30th August 2016 04:27 PM

Quote:

Originally Posted by mroether (http://www.diyaudio.com/forums/equipment-and-tools/299635-autoranger-soundcards-post4816033.html#post4816033)
Have you had the chance to take some photos of the PCBs?

Photos already posted...
http://www.diyaudio.com/forums/equip...ml#post4812938

Projected kit price seems to be around 150...

mroether 30th August 2016 04:38 PM

Thank you MarkS for pointing me to the pictures. I know the kit price is €150, I am asking for the costs of the electronic components which will add to the kit costs.

Michael


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