Mains voltage (230 VAC) is rectified and filtered with capacitor to 320 VDC, which is then chopped to 26 kHz square wave by using a H bridge of four MOSFETs, which is fed to a self-made transformer with 60 turns in primary winding and 600 turns in secondary winding. Current-limiting resistor is in series with primary winding, limiting it to about 2 A in case of accidental arcing.
Originally Posted by Photo Engineer
The result seems to be around 4.8 kV(rms), 26 kHz, and can give 200 mA of current with the series resistor, or more if it's removed. Of course using such a small electrode, it won't take this much current, but it's good to have some reserve in the power supply. In fact, I think this could supply a kilowatt or more...
Electrode is just an aluminium tube, with PVC tape in both ends to create the air gap of about 1 mm in the middle. The ground plate should be covered with some dielectric that prevents arcing if you want to treat the edges, too.
Last edited by hrst; 11-10-2010 at 04:00 AM. Click to view previous post history.