Not What Teacher Said to Do.
"Not What Teacher Said to Do."
Weird Science, Oingo Boingo.
While I would not normally use a power line GFI module as a hack, this has merit for some of you who would run your solid state projectors off bad power.
For those who do not know, a GFI is designed to monitor current in the safety ground lead of things like outlets in bathrooms, and cut the line voltage off in milliseconds if there is a short from line to safety ground, thus protecting a human from deadly shock. Required by code in modern installs, they are CHEAP and Reliable.
The circuit from Design Ideas, in Electronic Design Magazine, generates a false GFI trip if the line voltage climbs too high by forcing a current into the ground line. IT might save the odd switching power supply from a spike fault or a racing/runaway generator.
This may or may not have some merit for some whacked or dirty power lines used by laserists out to make a buck. Your mileage may very, and it needs to be built carefully and safely in a enclosed, grounded case.
No one in their right mind injects deliberate faults, but hey, if you can't afford proper protection, its a lot better then nothing.
Keep in mind you have to hit a button on the GFI to clear it.
http://electronicdesign.com/Content/...62965-fig1.jpg
If you do not know what a GFI is, or have never built anything for 110 VAC, this is NOT a project for you. Nor would I sell them, too much risk if something goes wrong. Heck, its probably a code violation to generate a fault other then for test purposes. For personal use in certain applications, it might supplement a UPS.
So it is a crude "crowbar" circuit, nothing more.
Disclaimers, 110AC is dangerous, can start fires, and can kill you.
I have not tested this, so I need to quote the other line from the song, "Why don't people understand
My intentions . . . . "
Steve
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Sir..? Got a dumb question.
Originally Posted by allthatwhichis
