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).

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I’ll post some of the most important features and specifications here:


  • motherboard: 81×88 mm.
  • matrix: 236×72 mm.


  • 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.

Dc power adapter for the spectrum analyzer

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.

RCA-Stereo Jack 2 m cable


  • 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.

Hard-disk Based MP3 Player With USB 2.0 capability

If you’re looking for a build-it-yourself, standalone, USB harddrive based MP3 player, this may be of interest to you. Originally conceived as a replacement for a CD player, this unit sits on the shelf next to your stereo and connects via standard RCA line-out audio connectors. Features of the player include:

  • Large, back-lit LCD display
  • IR remote-control receiver port
  • USB 2.0 connection for fast song transfers
  • Functions as a USB harddisk
  • 24-bit stereo audio out
  • Support for fixed & variable bitrate MP3 files to 320 kbps
  • Supports harddisks up to 137 GB

This is an open-source project. Full hardware schematics and software source code are freely available on the project site.

Hard-disk Based MP3 Player With USB 2.0 capability: [Link]

ATmega8 Video Overlay Circuit

This circuit design is very basic, but it does the job, and thats adding something over a video. Source code and schematics are provided on the authors page.

ATmega8 Video Overlay Circuit: [Via][Link]

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