No edit, so addendum: glancing at comments below, one thing to note: go take apart a toaster and examine the safeties in place there. That may give you some insight into commercial (safety certified, most likely) implementation of a similar technology in the consumer market.
I am glad, that finally someone posts this, because this is also my information about dangers of electricity. I just have not been sure enough, if I had missed something. I also heard, that a DC accident can kill you hours later even if you are not burnt that heavily, because DC is able to cause electrolysis in your body which upsets the delicate balance of electrolytes in your blood and tissue.
I would also use a solid state relay. And I would think about gluing the glass plate with high temp silicone to the PCB. This vastly improves thermal contact and so heat transfer which reduces peak temp and thermal lag in the control loop. Also it prevents exposed live wires even in case the glass breaks.
If you’re worried about activists using media to promote fear and doubt about science and medicine,you’re in the right place. At Science 2.0, scientists are the journalists. with no political bias or editorial control. But we can’t do it alone so please make a difference.
This time, though, he says he’ll only change course once the Senate votes on a binding bill. Now, it’s up to McConnell.
But I don’t like the mains powered heater in this case: If you take 120W @24V its just 5A. No problem for a switching transistor or wires with 0,5mm² and you keep the mains voltage in the PSU box. Which I prefer in this case. Mains rated cabling (230V here in Europe) are not thinner and need thicker insulation. In the worst case you have to have PE connection to any metal part of the construction.
FreeSync is available on the NU8000, Q6FN, Q7FN, Q8FN, and Q9FN. Once you’ve installed the latest firmware on one of those TVs, you can find it under Game Mode in the settings menu.
I’m always a little torn over really small camera bodies, as it can be uncomfortable to twist my longer-than-average fingers around a small handgrip. That said, I really didn’t find the smallish grip on the Sony A55 too objectionable. The design of the front grip naturally encourages my middle and third fingers to curve downward, my pinkie to fold underneath the body, and to carry the weight of the camera on my middle finger, between the second and third knuckle. My customary two-handed SLR grip, with one hand on the lens’ zoom ring made for a comfortable and secure hold.
I’ve spent four to eight years in apprentice school learning how to plan, install, inspect, and repair electrical products. Don’t insult my intelligence by implying otherwise.
You don’t need a big contactor to switch 1A at 120v, you can get little “ice cube” relays that switch up to 10A at 120V and they have a plug-in base so easy to change out when they inevitably fail. Most of them, in new perfect condition, make barely any sound. Nothing compared to the noise of fans and stepper motors. The only issue I can see is running AC mains voltage through wiring that is going in parallel with low voltage. Would need to use thick jacketed, shielded cable to prevent too much EMI. Maybe it’d be better suited using a separate transformer just for the heated bed, rectified/regulated but still a higher voltage for better efficiency. Speaking just from my experience as an electrician and hobbyist level electronics/3d printing experience.
This is true in a certain temperature range, I think between 70 and 90% of their nominal power. And in spite of that there are so many lamps with halogen bulbs, which are fitted with dimmer circuits. And you know why? Because the bulbs are very cheap, so nobody cares 
And they are often used as heating elements: in a professional reflow oven (3000,- euro class) and in laser printers. But in the end I think for the heated print bed you do NOT want a radiative heat source, it complicates the things
Yeah or you could just make an idiot-proof low-voltage one, probably cheaper and easier. That’s the argument, low voltage is much easier to do safely.
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