Life gets in the way. No matter how much you plan, there will always be circumstances that, at the very least, interfere with that plan â if not throw it completely out the window.
Anyone know a good source of information for dummies on electromagnet math? I’d love to build one of those electro magnetic pan brakes, but blindly connecting 240VAC to a coil scares me.
About 20yr ago I changed the big noisy (*) contactor for the 400V/3 phase 1kW pool pump to a 4 pole relay similar to this one: https://www.reichelt.at/Industrierelais/FIN-55-34-8-230V/3/index.html?ACTION=3&LA=2&ARTICLE=13324&GROUPID=7622&artnr=FIN+55.34.8+230V&trstct=pol_4 because of the noise it made. It makes small sparks at the contacts, but is switching every day in summer since 20yrs. If there is no cleaning work to do, the pump is only switched one cycle per day by a timer. So, maybe 2000 or 3000 switching cycles is not much for a relay, but it is sufficient. And even if it would burn out now, it had a 20yr lifetime. *) the loud “clonk” when it pulled in and sometimes humming from the coil. That disturbed my father sleeping in a near room. We do not need remote control, it just has to work.
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
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.
Ahh, my late, late night read of the datasheet for the MOC3041M, which the schematic initially? called out but then was changed to a MOC3041 had the mains load being carried by the MOC3041/M triac, not the BT137 triac. Good catch. The triac should still be able to handle 15 amps, not just 8. And I agree, I don’t see any heatsinking.
There are lots of big name professional meters that share the same ports for both. My Klein shares them.
The previous two Mi Mix phones were both pioneering attempts by Xiaomi to reduce the bezels around the screen as much as possible, but they predated the now-ubiquitous notch and compromised by awkwardly placing the selfie camera below the screen, forcing you to hold the phone upside-down or deal with an unflattering angle. Even Xiaomi itself adopted the notch earlier this year with the Mi 8. But the Mi Mix 3 preserves the spirit of the series while seemingly fixing one of its bigger flaws.
For a more detailed explanation of how to match MOVs to applications, check out the âDC Application Varistor Design Guide.â
McConnell, however, has said he doesn’t see any threat of Trump firing Mueller, and he indicated Tuesday that he would “probably block” the bill from coming to the floor if Flake pushed it a second time. On the other hand, Majority Whip John Cornyn has previously signaled that there could be an openness to considering the legislation to keep things moving on judicial nominees, especially as the Senate seeks to wrap business up toward the end of the year.
The second upgrade to the Sony A33′s LCD is the TruBlack technology we first saw on other recent Sony cameras. This is a combination of anti-reflective coatings and a darker mask around the LCD pixels, to keep shadow areas darker. It does seem to be an improvement over LCDs lacking it, but to my eyes, the difference isn’t dramatic.
The microwave I recently tore apart had a hefty resistor connecting the capacitor to ground, to quickly drain it of power when the magnetron itself wasn’t energized. (The capacitor itself had a label saying there should be a resistor bridging the cap’s contacts for the same purpose.)
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