January 10th, 2009
20 Band Audio Spectrum Analyzer
This is the final version of the spectrum analyzer, this is the version that will get shipped to buyers. The two boards can be connected either by cable or one on top of each-other trough pin headers. You need to specify the model you want on ordering. You can get the kit assembled or unassembled, for this there are two separate products in the shop(for assembly guide check the forum).
I’ll post some of the most important features and specifications here:
Dimensions:
- motherboard: 81×88 mm.
- matrix: 236×72 mm.
Power:
- 7,5 V 1 A DC (the maximum current draw is 600 mA).
- power is supplied to the board trough a 2,1 mm DC power connector.
- you can get this type of adapter from Youritronics shop.

Input signal:
- signal level 200 mV
- Audio input is supplied to the board trough 2 x RCA connectors.
- you can get this type of cable from Youritronics shop.

Features:
- 20×20 led bargraph display (red or green).
- 9 display modes selectable trough button 2 present on the display board.
- on/off (standby) control selectable trough button 1 present on the display board.
- ISP (in system programming, if you have an AVR programmer that supports this feature, you can update the firmwire if new version is released)
First units were shipped, and I’m curious about what you think related to the project so visit the Youritronics forum and share some of your thoughts also if you have any questions you can ask them there.









January 30th, 2009 at 5:31 pm
great kit! works awesome and easy to assemble!
January 30th, 2009 at 10:06 pm
I’m glad you like it.
February 2nd, 2009 at 1:39 pm
large 20 x 20 Matrix LED? thats inspire me to build, one decade ago i saw this thing use LM3914, several filter opamp, multiplexer signal and 4017. but it lost
February 5th, 2009 at 5:36 am
DO YOU KNOW THE SONG WHAT NAME IS
February 5th, 2009 at 9:13 am
the name of the song is Ashlee Simpson – Outta My Head (Ay Ya Ya)(Dave Aude Club Mix)
July 1st, 2009 at 12:35 pm
Hi Folrin,
I have looked everywhere for the schematics and building instructions for an ASA for my car, but my efforts have mostly gone nowhere. I have given up.
If the ASA in the video is for sale and it can somehow be installed in a car, I would like to obtain one.
How can I go about doing that?
July 1st, 2009 at 12:38 pm
Hi,
The spectrum analyzer is currently out of stock. I will let you know by email when it’s ready for shipping.
July 10th, 2009 at 11:30 pm
please alert me via email when new kits are availabel:
November 20th, 2009 at 8:14 pm
Hi!
Kit is currently out of stock.
Can I buy only a pre-programmed ATmega64? Maybe just put out the sources or hex file?
November 23rd, 2009 at 11:51 am
Hi Freiwind,
the source files are not available but the kit will be back on stock on december. If you want to buy a kit you can email me (contact page) and I would get back to you once the kit is back in stock.
December 3rd, 2009 at 5:06 pm
Can you please let me know when the Graphic Equaliser is back in stock. I need one for a job that I have to deliver on the 18th December 2009. I am in the UK. Is there a microphone imput? I would need an assembled one, asap
Thanks
Phil
ps nice work
December 31st, 2009 at 6:49 pm
[...] 20 Band Audio Spectrum Analyzer [...]
February 8th, 2010 at 8:01 am
Where can I purchase one?
February 8th, 2010 at 8:02 am
And how much are they?
February 8th, 2010 at 8:37 pm
the kit can be purchased here http://www.youritronics.com/shop
May 16th, 2010 at 4:56 am
If the device is mono and has 20 columns of LEDs and 20 analyzed bands, why does the device need 2 RCA connectors?
August 1st, 2010 at 6:07 pm
Darko, there are two rca’s because true audio output is almost always in stereo. (right and left) With only one RCA the spectrum analyzer would only detect and display half of the audio input.
August 1st, 2010 at 6:14 pm
Oh wait, u say the device is mono??? Well then 2 rca’s is a bit confusing…
August 1st, 2010 at 6:27 pm
The device uses both L and R channels to get the full spectrum from both of the channels. It then mixes the two channels on-board to analyze the combined signal.
To learn more about it check the user guide.
http://www.youritronics.com/shop/pub/Audio%20Spectrum%20Analyzer%20-%20User%20Guide.pdf
Anyway, the new version thats coming out in August will have lots of new features. You should register in the online shop to subscribe to newsletters. I’ll release a newsletter when the new version is out. Or you can just add this blogs feed to your reader and I’ll post an update.