Hi all, Ive bought a lot of led bulbs from China, and slowly getting some parts together to make them safer to use. So at first I was going to fit a fuse holder inside, but some bulbs sold in The UK had some 10 ohm 1/8W resistors in one of the bulbs a/c leads, so im thinking that would be a better was to add a little protection.
These bulbs have a very simple design, with a 820nf(400v) capacitor dropping the voltage before the rectifier, then a 47uf smoothing capacitor (63v) on dc side
So this was running those smd led's at full power, so I have replaced the 820nf with a 470nf and the 47uf with a 100v one.
So now the output is slightly less, but still good
So here I am undecided as to the value of the resistor inline with the 230v mains input, and its wattage rating. One the one hand I can calculate a value, but on the other hand I can see what already been fitted on the ones I bough in the UK, and I think those resistors was fitted to make them safer in the UK
10 Ohm 1/8W metal film, with heat shrink on them
I have to think about switch on current, and keep the value as low as possible so it never burns out unless there is something very wrong.
So what you think ?
I have had two bulbs go down, one went bang and blew the 47UF dc side capacitor, and another one of the led's went open, which then switches all led's off
These bulbs have a very simple design, with a 820nf(400v) capacitor dropping the voltage before the rectifier, then a 47uf smoothing capacitor (63v) on dc side
So this was running those smd led's at full power, so I have replaced the 820nf with a 470nf and the 47uf with a 100v one.
So now the output is slightly less, but still good
So here I am undecided as to the value of the resistor inline with the 230v mains input, and its wattage rating. One the one hand I can calculate a value, but on the other hand I can see what already been fitted on the ones I bough in the UK, and I think those resistors was fitted to make them safer in the UK
10 Ohm 1/8W metal film, with heat shrink on them
I have to think about switch on current, and keep the value as low as possible so it never burns out unless there is something very wrong.
So what you think ?
I have had two bulbs go down, one went bang and blew the 47UF dc side capacitor, and another one of the led's went open, which then switches all led's off