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Posted to www.diyPhysics.com:d.i.y. 250 kV High Voltage DC Power Supply with Neat Trick for Switching Polarity

I just posted at www.diyPhysics.com detailed instructions on the construction of a 250 kV DC high-voltage power supply.  Although my hack for switching the polarity (referenced to ground) is simple, I am very surprised that I’ve never seen it elsewhere! The hack consists of adding one more capacitor to the Cockroft-Walton multiplier so that it can

 
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d.i.y. CO2 Laser Power Meter

In my prior post I told about components in my CO2 laser’s RF power supply becoming unsoldered when they overheated.  After the repair, I needed some way of  retuning the RF output stage for maximum laser output.  This motivated me to build the power sensor shown in the picture above.

 
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CO2 Laser Engraver/Cutter Addition to a CNC-Retrofitted Sieg X2 Mini Mill

I was thinking about buying a laser engraver/cutter for home, but after retrofitting for CNC the Micro-Mark mini mill that my wife gave me for my birthday, I figured that I could simply add a CO2 laser to the X2 mini mill. Before describing the mod, I figured you would want to see some results. 

 
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