ATmega8 Spectrum Analyzer
posted Dec 27th 2009 5:18pm by Mike Szczysfiled under: digital audio hacks
[Manekinen] built a very responsive spectrum analyzer. The components at the party are what you’d expect, an ATmega8 does the hard work interpreting data from the LM324 op-amp. This build stands out because it is fast and configurable. In fact, the explanation of the calibration process is where this project shines.
Instead of using water, an HD44780 module displays the spectrum data. The device currently supports several different character displays including 16×2, 20×2, 24×2, and 20×2. We’ve embedded a video of a 20×4 VFD in action after the break. As the video progresses, watch for the Polish words that pop up. This corresponds to the brightness and sensitivity being adjusted with the 5-button keyboard.
i was disappointed in that, it is just some sort of wiz-bang display to put on a head-unit. I was hoping for a real audio spectrum analyzer that has dbu vs freq, adjustable BW, etc for optimizing amplifiers.