> Does the switching power supply have a transformer? No, it's a simple buck converter.
> Does the frequency change when you change load? No, just intensity. > Is the output noise within the power supply specification? The switcher's output is pretty clean, about 7 mVpp at 150 kHz. The OLED uses a +12 LDO; the oled side is pretty dirty (0.5 Vpp) but adding a huge cap to it (which nearly eliminates the noise) doesn't change the sound. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user