[sdiy] Cheap audio spectrum analyzer

[Rick Jansen]

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

> 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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