Cool other people have also thought of this so I know that it should be really usable.
The 120V-> 220V converter is a good idea! Connect that to a higher voltage bridge rectifier and a voltage divider output like 175V run your gels in 20 minutes for like $15 or $20.
Is this still unsafe even with the 1A load limit?
I mean obviously it is unsafe not being enclosed.
On Wed, Jul 3, 2013 at 3:45 PM, Patrik D'haeseleer <patrikd@gmail.com> wrote:
Here's an older article that does exactly that: dimmer + fuse + rectifier = 120VDC variable power supply for $20:
http://www.science-projects.com/PowerSupply.htm
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As you mentioned, this is horribly unsafe, but it does work. One upgrade would be to add an isolation transformer. Or better: get a 110->220V travel transformer (or a 220->110V one, and reverse it), so you get isolation from the mains *and* voltages up to 22VDC.
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