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Old 07-16-2011, 05:32 PM   #4942 (permalink)
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Originally Posted by dave koller View Post
It seems to suppress the ringing (med and high frequency) and snub the oscillation from longer lead inductance up to the resistors. Like I said, just a hunch. I have some longer traces from my opto drivers and I place the beads as close to the base of the inputs on my H-Bridge as I can get them. Without them I get ring and oscillation and messed up PWM signal.
I think it works because the ferrite used in those beads is quite lossy and the "ringing" is damped out by those losses in the eddy currents.

Hey jackbauer, it'll be interesting to see how much the coolant heats up. You could measure the losses that way.
Sometimes I sits and thinks and sometimes I just sits.
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