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Autoranger for soundcards
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Old 30th August 2016, 05:35 AM   #1
hochopeper is offline hochopeper  Australia
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Default Autoranger for soundcards



Thread edited to keep chronological order of moved posts.

Introductory note from Jan carried forward from old thread.

Quote:
Originally Posted by jan.didden View Post
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 View Post
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 View Post
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

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

Last edited by hochopeper; 30th August 2016 at 05:42 AM.
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Old 30th August 2016, 07:48 AM   #2
jan.didden is offline jan.didden  Europe
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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
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Old 30th August 2016, 08:29 AM   #3
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by Stefanoo View Post
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
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Old 30th August 2016, 09:08 AM   #4
MarkS is offline MarkS  United Kingdom
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Quote:
Originally Posted by jan.didden View Post
...that would probably come close to 150.
I'm fine with that price, so have your first order...
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Old 30th August 2016, 09:20 AM   #5
jan.didden is offline jan.didden  Europe
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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
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Old 30th August 2016, 12:31 PM   #6
MarkS is offline MarkS  United Kingdom
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Quote:
Originally Posted by SyncTronX View Post
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...
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Old 30th August 2016, 03:02 PM   #7
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by MarkS View Post
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

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
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Old 30th August 2016, 03:18 PM   #8
mroether is offline mroether  Germany
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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
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Old 30th August 2016, 04:27 PM   #9
MarkS is offline MarkS  United Kingdom
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Quote:
Originally Posted by mroether View Post
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...
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Old 30th August 2016, 04:38 PM   #10
mroether is offline mroether  Germany
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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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