Gregory's Server@SwiftOnSecurity another thing that takes more than a second to settle after unplugging is a PTC resettable fuse -- basically a resistor that is low resistance, until it overheats and "blows," but letting it cool down will reset it.
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 @StompyRobot @SwiftOnSecurity PTC fuses also slowly wear out, so the cool-down period gets inconveniently-longer with each time they "blow" unlike proper trip switches. But hey, they're cheap—I recently bought a 20-pack for €0.51—and that's all capitalism cares about.  @pndc @SwiftOnSecurity well, you're not supposed to blow them in there first place.,. Replacing a glass fuse is expensive and inconvenient too! @StompyRobot @SwiftOnSecurity There are a lot of things in this industry that are not supposed to happen but do anyway. It's a good day if "replacing a glass fuse" didn't involve the user crumpling up a chewing-gum wrapper and ramming it into the fuse socket.  @StompyRobot @SwiftOnSecurity right, ok. @StompyRobot Some resettable fuses will actually gain a permanent increase in resistance after a bit of abuse. The original Raspberry Pi2 were notorious for permanently damaging the fuse after attaching a 700 mA load to it, turning the Pi into a serial killer of SD cards from that moment onwards. The Pi2 really is a $30 disposable fuse protecting a $10 load... Yup. The very first use typically adds the most resistance. But we can compensate for this in design. |
@StompyRobot @SwiftOnSecurity
Does that mean I’m a PTCD?
Positive temperature Coefficient dog