PWM Controller

[OzGrant]

G'day,
Using a DF-Robot motor shield to drive a hard disk voice coil, but it whistles when anything other than 100% PWM is applied.
Have played around with a bit of capacitor filtering, with marginal improvements.
Can anyone suggest a PWM controller chip I could use, that has a higher frequency than the PWM O/P of the arduino.
Have read a few posts about changing the frequency, but would rather buy a an purpose IC that can do the job.
Did an google and found SG3526 etc, but would be nice if someone had used a similar device already.
Tks

[OzGrant]

G'day
Found my answer that allows the PWM freq to be 100kHz:

PWM capabilities

If you need precision timing, you will probably have to bypass many of the Arduino library functions and directly control the AVR peripherals (e.g. hardware timers) yourself using the mega168 registers (then again, I have little experience with what's out there so maybe you can find some existing libraries that will suit your needs). My advice is: don't be afraid to get your hands dirty and delve into the mega168 datasheet. The following code will generate a 100 kHz pwm on pin OC2B (Arduino dig…