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I decided to apply full voltage to one of my two MOT's today and noticed that above 80 volts, I could feel the variac dial vibrating as I adjusted the setting. Clearly at that point, the current draw begins to ramp up substantially. I decided to measure and record the idle current at various...

I'm not planning on drawing any arcs, at least not beyond a couple for shits and giggles. I want to cut out the HV secondaries and rewind them for low voltage and high current. I want to remove the shunts to remove the limitation on maximum current that the shunts otherwise impose. Regarding...

So, the college kids are all moving away for the summer and/or for good, and they're leaving behind tons of stuff, which includes microwaves. I managed to score me an old one, which must be at least 30 years old by the looks of it. Didn't have time to actually take it home, so I stripped it...

Hi all, I'm looking to buy one or two microwave transformers designed for the 240v/50Hz mains supply in the UK and Australia. I live in the US and will be running the MOT's on 120v/60Hz, with the idea that core saturation will be less of a problem due to UK/Euro/Aus units having to handle...

I pulled this UPS (Powerware 5115 750VA 500W 120V) from the junk bin at the local university and figured it would have some nice things in it. I took it apart and found out why they got rid of it. Looks like vapors from the battery corroded the heatsink and leads of one of the switching...

Maybe this is yet another reason I need to move elsewhere. I live in a community where alternative-energy pseudoscience and anti-oil propaganda abound, and apparently I'm over-accustomed to debating with the eco-whackjobs. They haven't caught on to "over-unity" yet, but the bullshit is still...

Have a look at this listing: "DC wind generator" That is NOT a generator. That is a battery-operated electric fan that's missing its casing and handle. The orientation of the fan blades, as well as the shape of the fan blades, makes this patently obvious. The fact that the permanent-magnet...

A while ago, I obtained a Superior Electric Type 136BU. This is rated at 22-amps and about 3.1kVA. I knew something was wrong with it when I got it, but the other day I finally took it apart and found that the damage was much worse than expected. The coil originally had 180 turns, but on both...

There is already a "ban" on the sale of green laser pointers and it doesn't accomplish anything. It does figure that he's a liberal, anti-gun piece of trash though. I wish nothing good on him. *shrug*

The guy is an idiot but the article, as expected, contains propaganda. Or if not propaganda, they are being intentionally vague. They mention "eye injuries" but don't specify what kind. Retinal burns? Momentary flash blindness? What? Given the distance from the airport (8 miles) and usual...

Crappy Ultrafire? Is there another kind? See the link in my sig, assuming you haven't already! UltraFire? UltraFAIL, more likely. The only way to win at this game is to not play. Get some LG's or Panasonics. Ultrafire will just make you feel ultra-shitty when it detonates in your face...

I want this so I can hold your planet for ransom. You better pay up, son. Or else I'm going to toast your bitches. And your mom. It's going to get real, because I'm going to toast your mom. Unless you fork out cash. Start forking it out! I'll send you my Paypal info. You better pay up or...

Chemistry lab stands are great for doing the laser rainbow. You can hold and aim the lasers individually and independently. I love it for photography. Check out some of Brucemir's photo shoots; he took the idea and ran with it, to great effect. Highly recommended.

Removed it carefully? You've been watching Photonicinduction, haven't you? Acrylic lenses are crap-o. They might be good enough in a pinch, but on the whole, glass is where it's at. Scratch resistance, solvent resistance, power flux resistance. More AR options? Yep. Acrylic lenses are...

Nonsense. Clearly they are transparent aluminum. McCoy would agree.

If there's a man of honor, Pman is that. I bow down to you, sir. With great respect.

Forgive me for posting another one of these. I keep googling for this, but there are a lot of "build a 240V power supply" links and that isn't what I'm going for. I'm thinking that one way of avoiding MOT core saturation would be to get a 240V/50Hz unit and run it on 120V/60Hz. Unless I'm...

And so the result of this would be that as load increases, the output voltage would fall more and more. I figured something like that would happen. I think that, at most, if I did anything with this it would be to charge capacitors, or something involving very low current. I wouldn't want to...

I imagine using a ballast on the mains/input side of it would prevent the worst if the transformer did decide to pop. 2.5 to 3 amps or so would probably do it. The step-up ratio of these units is about 4.3, so that would allow 500+ volts at ~500mA for short durations, assuming the insulation...

You don't need them for viewing the dot. Your best bet is to not look directly at the dot anyway – instead, you look very slightly above/below/to the side of it. This lets you appreciate the color better, while still having a good view of the dot, and it avoids excessive after-images and...