How do I take the bite out of a chopped sine wave?

yes  only one way don't buy a chopped wave transformer, only way I know. they are designed the way they are and can,t be changed other then  reassign one all over again from scratch.

Alan

Here's some discussion about using capacitors.

https://ogrforum.com/...26#74073050771031626

Thanks Roy. I am going to try introducing a non-polarized capacitor and see if that helps.

The NP cap sometimes helps, but truthfully there is not a total cure for the chopped waveform issues short of using a different transformer.  The issue is you're trying to alter the waveform of a high power output, that take high power components.  

The NP cap will knock some of the sharp edges off the chopped waveform, and frequently helps with the issues of older QSI and PS/1 boards not operating correctly with chopped waveforms.  I Don't know how good it's going to be for quieting the motors and E-Units.

If the major issue is that the E unit is buzzing too loudly, that can be fixed easily. Just power it via an on-board rectifier.

It's a bit more complex than that.  You also need a capacitor to eliminate the buzz.  In my bench test with a typical E-Unit and a diode, it took 1000uf to quiet it down.  470uf was close, but there was still a buzz.  I considered a bridge rectifier for about a millisecond, then I realized with the end of the E-Unit coil grounded that can't work, so the diode is it.