Reply To: edm machines

[Les Jones 1Participant @lesjones1]

I have only built an EDM based on Ben Flemming's capacitor discharge design. I have modified the servo design to allow it to work with either electrode polarity. I have done this by adding a precision rectifier circuit to the input so that it works with either polarity sense input.

This is the schematic.

This is the power supply part so you can see the attenuation and filtering of the sense signal from the electrode.

Les.