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Old 21st March 2017, 05:09 AM   #141
1audio is offline 1audio  United States
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Dealing with higher output amps-

It has a differential input on an XLR/TRS connector so why not a passive 10X "probe" to handle the higher voltages. Some resistors and a trimmer cap and its possible to scale accurately. However safety considerations need to be addressed. the days of exposed bananas and HV are long gone. Series 1 Meg resistors on each leg would actually do the job. A cap would be necessary to compensate for shunt capacitance in the cables.
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Old 21st March 2017, 08:36 AM   #142
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Early in the development I looked at including an additional 1Meg input for measurements in tube amps at high impedance points.
But getting it flat to 100kHz+ and relatively accurate made the whole thing exponentially more complex and calibration becomes also more involved.
So I let that be.

After the AR my next project may be a high impedance audio floating differential probe

Jan
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Old 21st March 2017, 08:39 AM   #143
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Quote:
Originally Posted by anatech View Post
There should be a way to break this log jam, and anything is better than nothing as far as this equipment is concerned. Best effort counts for me Jan.

So, should we expect a companion meter bridge for this, or will it be built in? Plasma meters please.

-Chris
A bridge for Bridge?

But this is a good discussion, for me to bounce my ideas of.

Jan
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Old 21st March 2017, 09:45 AM   #144
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> A transparent, wideband 60dB attenuator that can be adjusted in a typical DIY shack is no-go.

Can't you just include an additional, switchable, 10x attenuator in cascade for the few occasions one needs -40~-60dB ?
(Probably up front, since you want to have higher impedance for 100V anyhow.)


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Old 21st March 2017, 01:04 PM   #145
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The Zin is actually 100k. But if you add something in front of it, it may be OK with the -40dB setting but all others will be way off because there is a new Zin! So it would only work for one setting and I don't think that would be good.

Edit: Of course if you redesign all attrenuator steps it could work, but that makes it more complex. Currently I have a 40dB and a 20dB atten, in combination with 4dB steps. Your solution would probably double the number of relays and drivers and a lot more special value 0.1% resistors or combinations.
I don't really want to go into details of the design so you need to trust me on this ;-)

Jan
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Old 21st March 2017, 01:10 PM   #146
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This is terrific! I'll be watching for the Kickstarter
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Old 21st March 2017, 01:39 PM   #147
EUVL is offline EUVL  Europe
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Jan,

Is this similar to what you have now ?
Constant impedance relay-resistor logarithmic attenuator
(Scale up resistor values by 10x)


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Old 21st March 2017, 03:26 PM   #148
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Quote:
Originally Posted by EUVL View Post
Jan,

Is this similar to what you have now ?
Constant impedance relay-resistor logarithmic attenuator
(Scale up resistor values by 10x)


Patrick
No, not at all. To many relays and resistors ;-)
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Old 21st March 2017, 03:30 PM   #149
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Too bad.




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Old 21st March 2017, 05:56 PM   #150
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Quote:
Originally Posted by jan.didden View Post
The Zin is actually 100k. But if you add something in front of it, it may be OK with the -40dB setting but all others will be way off because there is a new Zin! So it would only work for one setting and I don't think that would be good.

Edit: Of course if you redesign all attrenuator steps it could work, but that makes it more complex. Currently I have a 40dB and a 20dB atten, in combination with 4dB steps. Your solution would probably double the number of relays and drivers and a lot more special value 0.1% resistors or combinations.
I don't really want to go into details of the design so you need to trust me on this ;-)

Jan
Jan,

Thank you for clarifying that the AR does calculate and display input voltage.

The AR displays the level being sent to the soundcard, displays the attenuation / gain setting, and from that calculates and displays the input voltage to the AR.

The DUT output voltage is not measured.

Minus any inserted attenuators, amplifiers or filters the calculated input of the AR is the output of the DUT.

DT
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