[sdiy] Cheap audio spectrum analyzer.. finally..

[Tim Ressel]

I have used the 35660 extensively. It is an excellent box for its age. 
It has a mode where you feed a chirp through the DUT and it magically 
smooths out the FFT results and gives a clean line. Very nice!  Wish I 
had one.

--tr


On 10/27/2015 10:28 AM, Jean-Pierre Desrochers wrote:
> I finally decided to go for this:
>
> HP 35660A (with option 001 memory installed)
> http://www.sglabs.it/public/SgLabs_HP%2035660A.pdf
>
> It was not cheap but around one third of eBay's mean prices
> for those working condition HP testers..
> and the dealer was 1 hour car ride from my home.
> I think it's a good investment.
> Ooooff !
>
>>>>>
>>>>> 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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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com