“If you can power the logic side with some +5V derived from mains, there is no point keeping the optocouplers, right?”
2) If breathing and everything seems fine, there can still be some arrythmia that will manifest only hours later. It is a good idea to visit a doctor for EKG readings, or at the very least have someone monitor you for the next few hours and if you go unconscious, be present to give CPR & call ambulance.
⢠Lightning: In fact, transients induced by lightning are not the result of a direct strike. A lightning strike creates a magnetic field that can induce large magnitude transients in nearby electrical cables. A cloud-to-cloud strike can affect both overhead and buried cables. The outcome also is unpredictableâa strike that occurs a mile away can generate 70 V in electrical cables, and another can generate 10 kV from 160 yards away. ⢠Inductive-load switching: Generators, motors, relays, and transformers represent typical sources of inductive transients. Switching inductive loads on or off can generate high-energy transients that intensify in magnitude with increasingly heavy loads. When the inductive load is switched off, the collapsing magnetic field converts into electrical energy, which takes the form of a double exponential transient. Depending on the source, these transients can be as large as hundreds of volts and hundreds of amperes, with durations of 400 ms. Due to varying load sizes, there will be variance in wave shape, duration, peak current, and peak voltage of the transients. Once these variables are approximated, circuit designers will be able to select a suitable suppressor type. ⢠Electrostatic discharge (ESD): This energy is the result of an imbalance of positive and negative charges between objects. Itâs characterized by very fast rise times and very high peak voltages and currents.
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If you had the choice between two identical-looking boards, with the same pictures, and review ratings, would you spend an extra 20¢ on the more expensive one? That twenty cents really adds up, you know- if I was buying 1,000 ESP-12 boards, for example, that would be two hundred dollars saved, and you would be pretty happy with yourself. That is, if it works. Otherwise, you feel really dumb.
I think the issue is more that 8A might be fine for a light but embedding it where another future operator will reasonably assume it is rated at 15A is not fine.
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.
>Basically, cheat until caught. I’m a high schooler in America, and my “fellow peers” pull the same bullshit- and then when they get caught, they get mad at the teachers. >And their government seems to actively turn a blind eye to all manner of this nonsense. Aaand so do peers at my school.
Current starts derating at about 82C (see page 12). But look at the size and configuration of the heat sink required for a 25A SSR, it is 100mmx100mm with lots of fins (see page 13). That will be with lots of free air, preferably mounted so the fins are vertical or with some forced air flow.
A mains isolation transformer. wdwd [GFDL], via Wikimedia CommonsAn isolation transformer isolates the mains supply from the earthing system. This does not change any of the risks inherent to the mains voltage or other high voltages in your device, but it does provide you with some level of protection should you accidentally provide a path to earth from a live component.
There are many applications that don’t require 10A switching. As long as you are aware of the power limit of the device, there’s no harm in making a version for 1A or less.
On my printer I closed the sides, took the heated bed off and fitted a relay on the driving wires connected to a travel (230 volt AC) hair dryer screwed to the back. ABS prints like PLA now, no warping or other problems other than the normal ABS shrinkage factor.
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