[sdiy] Cheap audio spectrum analyzer

Sarah Thompson plodger at gmail.com
Mon Oct 26 19:58:39 CET 2015

I can recommend picking up an older HP dynamic signal analyzer -- I have an HP 35660 that will do everything you want and more. Awesome piece of kit. They have a generator that can do sweeps, noise, etc, and have two inputs that effectively give you full network analyzer capabilities, including phase response, group delay etc. as well as the more usual frequency plots.


> On Oct 26, 2015, at 08:25, 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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