[sdiy] Cheap audio spectrum analyzer

[Jean-Pierre Desrochers]

Le 2015-10-26 11:51, Rick Jansen a écrit :
> http://www.cnx-software.com/2013/07/24/359-red-pitaya-board-combines-an-oscilloscope-a-spectrum-analyser-a-waveform-generator-and-more/
> 
> ~360 US$
> 
> rick
> 

Thanks Rick but,
This still needs a PC to run...




>> On 26 Oct 2015, at 16:25, Jean-Pierre Desrochers <jpdesroc at oricom.ca> 
>> wrote:
>> 
>> 
>>> Again, what do you mean by "cheap"...? What is your budget, and what
>>> level of performance do you want to measure?
>> 
>> Lower than $500.
>> 
>> 
>> 
>> Le 2015-10-26 11:18, Neil Johnson a écrit :
>> 
>>> Jean-Pierre Desrochers wrote:
>>>> Do you know of a cheap audio spectrum analyzer I could buy to check 
>>>> 20-20khz frequency response on audio stuff ?
>>> Define "cheap".
>>>> That would includes sinus generator + analyzer in the same box.
>>> Ok.
>>>> I checked on eBay and most analyzers are RF band based and are so 
>>>> $$$$$ expensives. But 2 things:
>>> You're looking for the wrong kind of thing.
>>>> - I don't want to use analysis software on a separate PC - Any DIY 
>>>> projects with micro/graphic LCD would do.. I want a standalone 
>>>> analyzer.
>>> Well, for a complete standalone box I would recommend an HP Dynamic
>>> Signal Analyser, such as the venerable 3561A, or something a little
>>> more modern such as a 35660A. Pros: all-in-one, built-in screen, will
>>> do amplitude and phase response. Cons: dynamic range ok but won't get
>>> down to the very low levels of noise and distortion.
>>> The next step up would be audio analysers, such as the HP 8903 or
>>> something from Audio Precision. While the 8903 does have a built-in
>>> computer and can do sweeps, the display is 7-seg LED so you'll need a
>>> pencil and some graph paper. The Audio Precision kit needs an
>>> external control computer, but can measure the very lowest noise and
>>> distortion.
>>> Again, what do you mean by "cheap"...? What is your budget, and what
>>> level of performance do you want to measure?
>>> Neil
>>> --
>>> http://www.njohnson.co.uk [1]
>> 
>> 
>> 
>> Links:
>> ------
>> [1] http://www.njohnson.co.uk
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