I picked up a very nice 0-4kV 0-200 ma adjustable lab supply on eBay
for $100 (delivered...and it weighs 50 pounds) last month.
It has voltage, current, or (uniquely) power limiting available.
The search term to add is electrophoresis. Apparently the medical
community does some interesting things with high voltage and petri
dishes.
Tom Frank, KA2CDK
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