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Engineering
Electrical Engineering
Novice question about Relays, Capacitors, and Diodes
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[QUOTE="Rive, post: 6209421, member: 324024"] Capacitive loads are relatively easy, since any capacitor would be able to store the energy deposited after the circuit disconnect still at the same voltage: but inductive loads are different since they 'try' to maintain current without any concern about the voltage needed, and while doing this they have the backing of the energy stored in the magnetic field. Without suppression this might get pretty violent. A simple light tube choke coil can produce fat, 10kV arcs after disconnecting just a 5V battery from it... Of course real loads are usually not this thorny, but for example switching a small motor or an electromagnet needs some care. For simple cases any search for '[URL='https://en.wikipedia.org/wiki/Flyback_diode']flyback diode[/URL]' will do. For advanced studies, it is '[URL='https://en.wikipedia.org/wiki/Snubber']snubber[/URL]'. What I know about this is limited to the first part, with knowing when to call for an expert :sorry: [URL='https://en.wikipedia.org/wiki/Flyback_diode'] With a battery you have to design for the maximal and the minimal voltage too, not just for the nominal (for a 12V lead-acid battery, it is 14V, 12V, 9V... Quite a range). And in case of LEDs it is important, since those are not linear with V and A. Slight change in voltage might cook the thing. Just one more small remark on the USB charger. These are [B]chargers:[/B] things are not necessarily expected to actually [B]work[/B] when connected. You better check the output voltage and noise.[/URL] [/QUOTE]
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Novice question about Relays, Capacitors, and Diodes
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