My spectrum analyzer is a bit unconventional. I use a SuperSID monitor I got from Stanford.edu (think I paid $60 or something) and built a coil maybe about 30 inches square with magnet wire. Can't recall how many turns (400 feet of wire), but whatever they say in the instruction manual on-line. Then I run this through the Spectrum Lab software. Since my laptop does not have an internal sound card I got the SD-AUD20101 which has 24 bit 96 kHz. You can get by with less if you don't want the higher frequencies, but it's cheap enough. Anyway I just place the LRL near the coil in line with the windings. There are other DIY SID monitors on line. I was going to build the Gyrator III. Got the board but...
|