Timeline for led resistor calculation, and resistor wattage?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 8, 2018 at 1:18 | comment | added | jonk | @DavidScheiber I should add that part of the complications come from safety issues and some from the usual power supply you are using, relative to the power supply needs of an LED. | |
| Jan 8, 2018 at 0:29 | comment | added | jonk | @DavidScheiber The resistor is used like a fuse and should be on the hot side. The capacitor needs to be designed to fail "short" so that it will cause the resistor/fuse to open up in case the capacitor does fail for some reason. It's just a protection scheme. If you place the capacitor on the hot side, I suppose you could use a Y2 type that should fail "open" and achieve it that way. But it is perhaps better to have the capacitor cause the resistor to open, and for the failed capacitor to ground the circuit too. | |
| Jan 8, 2018 at 0:19 | comment | added | David Scheiber | or wait is it just to limit the current? i'm getting confused over the simplest of circuits :( | |
| Jan 8, 2018 at 0:12 | comment | added | David Scheiber | I think Im kinda getting it, but why have the capacitor on the ac side, why not after the bridge rectifier, or does it not matter? | |
| Jan 7, 2018 at 23:52 | history | answered | jonk | CC BY-SA 3.0 |