Re: [CAD_CAM_EDM_DRO] Re: EDM GENERATORS

At 12:20 PM 8/7/2007, you wrote:

>it does seem that one should have a test for short before each pulse,
>if that can be added to the circuit.

Putting a small voltage limited current into the work (e.g. 1 mA and
0.6 Volts) after a short delay (to allow the channel to decay) should
either result in zero volts (short) or 0.6 Volts (depending on the
voltage limit.) The circuitry is pretty simple, but the devil is in
the details -- protecting the comparator from the HV spikes.


David G. LeVine
Nashua, NH 03060