Electronics > Projects, Designs, and Technical Stuff
Analog Disovery as Audio Analyzer
<< < (8/32) > >>
jaxbird:

--- Quote from: fivefish on December 14, 2015, 07:31:55 pm ---jaxbird: Are you using Analog Discover or Analog Discovery 2? 

Side-Topic: What's the advantage of AD2 vs. original AD?  Will Waveforms 2015 run on the original AD?

I'm deciding what kind of AD to get to run jaxbird's software :)

--- End quote ---

Mine is the v1, but even v1 got different hardware versions, mine is revision C or D I think. But they are all compatible afaik, even with version 2. From a quick look I believe the major differences is that v2 got more analog bandwidth (30MHz+ vs 15MHz+) and a variable output power supply (v1 is fixed +/-5V, 50mA limited). Waveforms 2015 runs just fine with my v1.

I'd get a v2 if I need to get another one.

If you get one you might be interested in this other project I did based on the Analog Discovery:
https://www.eevblog.com/forum/projects/impedance-analyzer-build-and-experiments/135/

jaxbird:
And just for fun, why not :) ... this is a single ended mono amplifier, need two for stereo, capable of something like 5-10W output. Analog Discovery for scale and my little class D test amplifier board next to it.

I don't actually use these amplifiers as they don't produce much watt and I don't have any appropriate high efficiency/gentle impedance speakers for them, but to be honest, their coolness factor is hard to beat, so they do have a prominent display in my living room. I originally got them quite cheap as they were not working well, so I've done some work and modifications to get them into good working order. It was during this repair work I thought I needed something to easily measure and diagnose an amplifier resulting in the software I'm now doing for the Analog Discovery.



mtdoc:

--- Quote from: jaxbird on December 15, 2015, 06:33:17 am ---
--- Quote from: fivefish on December 14, 2015, 07:31:55 pm ---jaxbird: Are you using Analog Discover or Analog Discovery 2? 

Side-Topic: What's the advantage of AD2 vs. original AD?  Will Waveforms 2015 run on the original AD?

I'm deciding what kind of AD to get to run jaxbird's software :)

--- End quote ---

Mine is the v1, but even v1 got different hardware versions, mine is revision C or D I think. But they are all compatible afaik, even with version 2. From a quick look I believe the major differences is that v2 got more analog bandwidth (30MHz+ vs 15MHz+) and a variable output power supply (v1 is fixed +/-5V, 50mA limited). Waveforms 2015 runs just fine with my v1.


--- End quote ---

I suspect there is no significant difference between hardware versions.  Scope bandwidth on V2 is advertised as 20 MHz with BNC adapter on the NI website and 30MHz on Digilent's site. The spectral characteristics diagram for V2 on it's wiki page is the exact same as the one on page 16 of the V1 technical reference manual. In fact the V2 wiki looks to just be a web adapted version of this manual.  Digilent made a silly marketing decision with V1 to market the scope as 5 MHz because they "did not want to confuse students" who might not understand the concept of a -3dB bandwidth.  You can read this on page 16 of the technical reference manual.

I think once Digilent was bought by National Instrument, NI decided to put the AD in a new case and call it V2 with a more accurate bandwidth advertised. (though I question the 30 MHz bandwidth given the 100 MSPS for both scopes ADC, regardless of the -3dB measurement) 

I'll be happy to be proven wrong but I think the only additional hardware of note is the addition of external power input to augment the power supply - the least useful feature of the AD IMO.    Basically I think V1 = V2 just without the fancy case, ext power input and marketing fluff.
fivefish:
jaxbird, big kudos to you on this project.

More questions: I assume the software will work with line level signals?

How about what if I need to measure DUT gear with balanced input/output, I'm thinking I'll need to convert the signals from the AD to balanced and vice versa before feeding it to the DUT gear. Have some kind of breakout box with the balanced converter circuits before the AD box? will that screw up the readings?

-- how about a "normalize" function, say measuring freq response, have the software automatically normalize the resulting curve to 0dB reference.

bson:

--- Quote from: jaxbird on December 15, 2015, 06:26:25 am ---In essence what you are saying is that there is no point in standardized testing of amplifiers as using resistive loads are not equal to speaker loads.

--- End quote ---
Yes.  Did you follow the suggestion to run a simulation with different kinds of loads?
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod