Do not build the suggested circuit which runs directly from AC wall jack. The article should be taken off your blog in my opinion similarly to suggesting that people should use EtBr at home (which also should just not be done).
Search the archives for my description of a simple current-limited power supply for electrophoresis at 220V. The description is as follows. Total cost about $22-$25 from components bought online, no electronics knowledge required, some soldering is required. Uses a 120V AC to 12V DC cigarette lighter adapter, then a 60W, 12VDC to 220V AC automobile inverter (EU version, for 220VAC), an EU wall plug (to plug into the EU automobile inverter), a bridge rectifier, and a filtering capacitor. That yields 220VDC, current limited to 1A.
Don't forget that AC voltage is listed as RMS so the actual peaks are higher (1.4x).
It would be possible to put all this together on a custom circuit board, overall though not really worth the effort since the inverter uses a switching power supply internally which would require some tuning to get right. It would be a good project for an undergrad EE as a class project though, for ex. in a Power Systems class.
## Jonathan Cline
## jcline@ieee.org
## Mobile: +1-805-617-0223
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