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Old 18th March 2017, 05:42 PM   #111
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by jan.didden View Post
... the ar (no capitals) ...
Jan
Thanks Jan, that is all clear now and please use AR not ar, it makes you(us) all sound like some sort of a pirate ar... ar... And, as an IT specialist, I'm obligated to use upper cast for each first source-letter in the new acronym or label.

So you could do 'AuRa' for 'AutoRanger' but AR works for me, I will never forget it (in this context).
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Old 18th March 2017, 07:05 PM   #112
jan.didden is offline jan.didden  Europe
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Originally Posted by skidave View Post
I used to be worried about seeing level into the sound card (yes, RMS) and used to hang a volt meter off the input terminals to the sound card. However, after about a day of using my setup, I became very comfortable with everything and removed the voltmeter and have not turned back. Now, I know with Pete Millett's interface, he has a RMS meter. If I were going to build an active unit, I would include the RMS meter. So long winded...nice to have, but not needed. Maybe terminals to connect an external meter if the user chooses.
The thing is when I put up a level value it will never be exactly the same as what ARTA or whatever will show. So maybe it is best to just show the sweet spot that is selected, like 'Nom: 0.5V' .
Anyway there is both a single-ended and balanced output so you can always use the unused one for metering.

Jan
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Old 18th March 2017, 08:54 PM   #113
1audio is offline 1audio  United States
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I just did a quick check with two soundcards, Juli@ and EMU 1212M The 1212M in +4 mode (Pro?) seems to want about 1V. In consumer (-10) mode its .35 volt. The Juli@ single ended input wants about .35V as well.

I don't have a typical consumer card here at the present (The Xonar DX is on its way to another project).

The steps are about 10 dB apart. It suggests 1V, .316V and .1 V may be good targets for a reference output level. I don't know what the gain/loss steps are for the AR so that's my next task. I'll take the AR set to 1V and swing the level as far as I can looking at the steps. I'll see how it handles 100V.
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Old 18th March 2017, 09:43 PM   #114
jan.didden is offline jan.didden  Europe
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The ar goes from -40dB to +16dB in 4dB steps in trying to keep the output at 1V.

Jan
Attached Files
File Type: pdf ar sweep low sens hi level.pdf (10.9 KB, 45 views)
File Type: pdf ar sweep low sens lo level.pdf (11.0 KB, 19 views)
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Old 19th March 2017, 04:45 PM   #115
blmn is offline blmn  Brazil
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Hi, Jan!

Very well done! Congrats!

When it will available for sale, if you were planning to sell that?

Regards,
Hi, Jan,

Sorry if Im missing something, but if you dont mind, can you clarify my doubt?

If it is a dumb question, I beg your pardon in advance.

Regards,
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Old 19th March 2017, 04:49 PM   #116
blmn is offline blmn  Brazil
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Originally Posted by 1audio View Post
I just did a quick check with two soundcards, Juli@ and EMU 1212M The 1212M in +4 mode (Pro?) seems to want about 1V. In consumer (-10) mode its .35 volt. The Juli@ single ended input wants about .35V as well.

I don't have a typical consumer card here at the present (The Xonar DX is on its way to another project).

The steps are about 10 dB apart. It suggests 1V, .316V and .1 V may be good targets for a reference output level. I don't know what the gain/loss steps are for the AR so that's my next task. I'll take the AR set to 1V and swing the level as far as I can looking at the steps. I'll see how it handles 100V.
Im using Xonar Essence and Juli@ and both, with Virtins, have the best performance (at least with my setup) in about -10dB level of Virtins input level indicator.

Regards,
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Old 19th March 2017, 05:29 PM   #117
jan.didden is offline jan.didden  Europe
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I think I can do a jumper-selected sensitivity of 1V, 0.5V, 0.3V or something like that without compromising transparency. It would give the balanced output a few 100 ohms Zout.

Jan
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Old 19th March 2017, 05:30 PM   #118
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by blmn View Post
Hi, Jan,

Sorry if Im missing something, but if you dont mind, can you clarify my doubt?

If it is a dumb question, I beg your pardon in advance.

Regards,
No dumb question at all! I expect to finalise and start a Kickstarter in about 6 weeks.

Jan
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Old 19th March 2017, 06:15 PM   #119
blmn is offline blmn  Brazil
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No dumb question at all! I expect to finalise and start a Kickstarter in about 6 weeks.

Jan
Tks Jan! Im very interested and Ill wait that!

Regards,
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Old 20th March 2017, 07:59 AM   #120
jan.didden is offline jan.didden  Europe
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There's something else I'd like some thoughts on.
What are the signal levels you'd expect to input to the ar? For instance, if you want to check a 300W/8ohms power amp at full power, you'd have almost 50V RMS input signal. I would think that's about the max people would use.

This is not the same as the max input level without breaking it - in my current prototype you can easily input 100 or 120V RMS and nothing will break.
But for max input level for outputting the 'sweet spot' voltage to the soundcard, it seems to me a 50V RMS max spec would be more than enough.

Thoughts?

Jan
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