Hey ya'll, thanks in advance for taking a look at this.
I'm using an hbridge/solenoid to whack something. The circuit is working fine. 
When I use PWM to control how hard the solenoid hits, I can hear it as an audible tone out of the solenoid. It's quiet, but loud enough that it sounds like I have a squeaky solenoid, and that doesn't fly for this application.
Anyone know of a way to mitigate this? I've considered:
a) putting in an analog low pass filter to filter out the audible portion of the frequency
b) changing the PWM timing on the Arduino (somehow getting it above 18-20kHz?)
c) a brilliant solution that I haven't thought of that you will share with me
Thoughts? Thanks a bunch!
-Nate
