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norvbul 14th October 2002 05:53 PM

audio spectrum analyzer
:xeye: Where can I find schematics for an audio spectrum analyzer? Help!!!!

tiroth 14th October 2002 06:25 PM

A from-scratch spectrum analyzer would be astoundingly complex. There are computer programs that use a soundcard (e.g. AudioTester) or digitizing scope (bitscope) to do spectrum analysis.

norvbul 14th October 2002 06:46 PM

The type I am thinking about is of a more simple nature, more for visualisation than measurement. The type generally found in graphic equalisers that just give a graphic display of the frequency levels.

johan 14th October 2002 06:52 PM

The Elektor Electronics Magazine has made one. Schematics are available in the book 101 test instruments. I don't know if it is for sale anymore. Look in a library ;)
This is a completely analogue circuit. Lot of work to make because of the lot of filters.

Maybe if you know someone that bought the Welleman spectrum analyzer kit, and talk nicely to him, you can get the schematics :)

jackinnj 14th October 2002 07:39 PM

It doesn't have to be complex
Zetex make a chip (this was discussed in Electronics World last year) called the ZFX36L01 -- it has a mixer in it and you can configure the chip for bandpass or notch. All you need to do is make a sweep generator for the local oscillator. Will it make a lab instrument -- no way -- but it can greatly simplify construction.

Or you can get a HP 3581 analyzer for less than $100 -- and this is a great bargain. Last one traded on Ebay for $72. See the manual I put on the web at

adrianbodor 5th March 2006 06:00 PM

That circuit is not also specified somewhere in Elektor Magazines?

I can't find the book 101 from elektor.


oPossum 6th March 2006 12:06 AM

Here is a simple 10 band LED analyzer for a "light show".

Low res (603k PNG) Hi Res (4.9M TIFF)

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