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The ESD protective wrist strap should not tie you to a hard ground, it usually has a 1Meg resistor included, just for this reason. But perhaps not every cheap chinese one has?

You do in fact need to be a licensed engineer/electrician to design stuff with mains voltage, or you need to have your work inspected and signed for by one. It’s not just a matter of good instruction – it’s illegal for the regular Joe to even repair mains powered circuits beyond swapping a frayed power cord.

*My* electricity is cheap (~$0.065/kW), so that 117 miles would cost about $7.61. Gas in my area is down to about $2.70/gallon, so the total fuel cost for those 253 miles would be about $16. Other areas of the country might be higher for electricity and lower for gas.

The crimp terminals I am using are rated for 24A, and I am using a ratcheting crimping tool. I have checked, and therefore I do not believe you.

As far as litigation goes? I know enough about Chinese law to know that it’s really up to Fotek and whether Fotek applied for trademarks in China or not, and whether they did the rest of the intellectual property legwork in China (which is really tricky because China doesn’t use common law like Western countries do, so it’s a harder system to navigate). If they did, then yea, the counterfeiters could probably be sued although it’s a whack-a-mole game, the counterfeiters come up faster than they can be whacked down. But if Fotek didn’t go through the China IP process to protect their brand, then the counterfeiters may have actually applied for the trademark themselves in China, gotten the right to use the name, took the likeness and everything, legally (at least in China). Best Fotek could do at that point is try to keep them from being imported into the USA (similar to the Sparkfun fluke-colored DMM’s a few years back) but again that’s a whack-a-mole game that they wouldn’t win.

The nostalgia for “classic” miniature consoles isn’t ending anytime soon, either: Sony just announced today it’s making its own PlayStation Classic console. The tiny PS1 will come with “20 genre-defining titles,” and it’s set to release this December for $99.99. Also coming this winter is the Sega Mega Drive collection on the Nintendo Switch, and the trailer for it was published today.

[Ron] does a nice job of explaining some basic concepts like using opto-isolators. However, the real value to the video is the easy way to interface to the existing controller. A little configuration into Home Automation rounds out the project.

All silly, make graphene in a blender combine it with acrylic paint, then paint it on. Making heated beds is anything but an art form. Or just use graphite.

I worked in telephony for many years, and the ring voltage can be as high as 180 bolts at various frequencies, but, rather low current. In really old telco systems it may also be a square wave.

The number on this photo is a little misleading. 337 mpg! I think I shot it after having the car for about ten minutes, nearly all of it without using the petrol engine. Still, it’s a nice little tease for any friends riding along.

Even if a business without a license can charge you less, it’s worth looking for a licensed electrician like me. Most states require professional electricians to be licensed, so a person without one is a red flag. He or she might not have insurance and could stop picking up the phone if something goes wrong. As a licensed electrician, I will be held accountable—which is good news for my customers. Check out these other 35 things every homeowner needs to know.

With the primaries wired together, the magnets are epoxy potted, the business end is faced off cleanly, and the whole thing put to the test. [MakeItExtreme] doesn’t go into control details in the video below, but the website mentions the magnet being powered off a 24V 15A power supply with battery backup in case of mains failure.