Spectrum Analyzer

Overd0se · 9th July 2004, 10:15 PM

I'm looking for a schematic or kit to build a spectrum analyzer. I really like the velleman k4300 kit pictured here, but that kit has been discontinued. I have been unable to find any stores with residual kits laying around. The analyzer will be mainly for aesthetics. If I can't find a schematic, I've considered buying a cheap led spectrum analyzer/eq on ebay, and removing the analyzer circuit.

fermaciel1771 · 3rd June 2011, 02:50 PM

Hi,
I´m want to build a SA too. The circuit is based on LM 3915 from National Semiconductor. You can use Led or Led bar with 10 segments, or, in my case a VFD from Futaba, but if you are intented to use VFD you must have to multiplexing. The Led schematic is more easy and multiplexing is not an obligation using 1 LM 3915 per 10 leds. The frequencies for each bar i´ll use an op amp such as TL 084 as frequency filters.

regards,
Fernando M.

LAJ · 3rd June 2011, 03:06 PM

on a PC with a sound card.
If you have a low end PC you can run Win ME which has a built in SA.
Its under the visualizations called bars and graphs.
And there is some third party software out there as well.

djQUAN · 3rd June 2011, 04:27 PM

ESP has a new graphic analyzer project:

Project 136

9th July 2004, 10:15 PM	#1
Overd0se diyAudio Member Join Date: Jul 2003 Location: .	Spectrum Analyzer I'm looking for a schematic or kit to build a spectrum analyzer. I really like the velleman k4300 kit pictured here, but that kit has been discontinued. I have been unable to find any stores with residual kits laying around. The analyzer will be mainly for aesthetics. If I can't find a schematic, I've considered buying a cheap led spectrum analyzer/eq on ebay, and removing the analyzer circuit.

3rd June 2011, 03:06 PM	#3
LAJ diyAudio Member Join Date: Mar 2008 Location: Atlanta Ga. USA	Software is the way to go... on a PC with a sound card. If you have a low end PC you can run Win ME which has a built in SA. Its under the visualizations called bars and graphs. And there is some third party software out there as well.

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3rd June 2011, 02:50 PM	#2
fermaciel1771 diyAudio Member Join Date: Dec 2010	Hi, I´m want to build a SA too. The circuit is based on LM 3915 from National Semiconductor. You can use Led or Led bar with 10 segments, or, in my case a VFD from Futaba, but if you are intented to use VFD you must have to multiplexing. The Led schematic is more easy and multiplexing is not an obligation using 1 LM 3915 per 10 leds. The frequencies for each bar i´ll use an op amp such as TL 084 as frequency filters. regards, Fernando M.

3rd June 2011, 04:27 PM	#4
djQUAN diyAudio Member Join Date: May 2004 Location: manila	ESP has a new graphic analyzer project: Project 136