> 20khz PWM can still have audible harmonics... there are actually spread spectrum/randomized PWM approaches to address this, and to help with EMI. !! Great..

> 20khz PWM can still have audible harmonics... there are actually spread spectrum/randomized PWM approaches to address this, and to help with EMI. !! Great.. now I have to consider Tempest shielding for all the displays; I had thought once CRTs went away, we'd be safe...