audio spectrum analyzer

norvbul · 14th October 2002, 06:53 PM

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

tiroth · 14th October 2002, 07:25 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, 07:46 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, 07:52 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, 08:39 PM

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. http://www.tech-diy.com/ZXFL01.htm 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 http://www.tech-diy.com/hp3581.htm

adrianbodor · 5th March 2006, 07:00 PM

That circuit is not also specified somewhere in Elektor Magazines?

I can't find the book 101 from elektor.

Adrian,

oPossum · 6th March 2006, 01:06 AM

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

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

14th October 2002, 06:53 PM	#1
norvbul diyAudio Member Join Date: Oct 2002 Location: Montego Bay, Jamaica	audio spectrum analyzer Where can I find schematics for an audio spectrum analyzer? Help!!!!

14th October 2002, 08:39 PM	#5
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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. http://www.tech-diy.com/ZXFL01.htm 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 http://www.tech-diy.com/hp3581.htm

6th March 2006, 01:06 AM	#7
oPossum diyAudio Member Join Date: May 2005 Location: Michigan	Here is a simple 10 band LED analyzer for a "light show". Low res (603k PNG) Hi Res (4.9M TIFF) __________________ Possum - the other white meat

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14th October 2002, 07:25 PM	#2
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	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.

14th October 2002, 07:46 PM	#3
norvbul diyAudio Member Join Date: Oct 2002 Location: Montego Bay, Jamaica	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.

14th October 2002, 07:52 PM	#4
johan diyAudio Member Join Date: Sep 2001 Location: Finland, Ostrobothnia	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

5th March 2006, 07:00 PM	#6
adrianbodor diyAudio Member Join Date: Jul 2004 Location: Romania	That circuit is not also specified somewhere in Elektor Magazines? I can't find the book 101 from elektor. Adrian,

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