Re: [CAD_CAM_EDM_DRO] Why don't we use ferrites??

Christopher Morse wrote:

> Would op-amp based active filters provide better
> performance and lower cost?

No. The filter I described, in my servo amp, takes rectangular
waves of varying duty cycle, 100 KHz, 80+ V and up to 10 Amps.
I don't see how you could save money, or use chip-style op-amps
to replace this. A totally linear servo amp (or stepper driver)
would pretty much avoid the problem, but it would NOT improve
performance or lower cost, that's for sure!

Jon