XPost: uk.d-i-y, alt.home.repair
From: Gothberg"@internet.co.is
On Thu, 20 Dec 2018 19:24:19 -0000, Rod Speed wrote:
>
>
> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message
> news:op.zubprsfco5piw3@desktop-ga2mpl8.lan...
>> On Thu, 20 Dec 2018 13:19:55 -0000, whisky-dave
>> wrote:
>>
>>> On Thursday, 20 December 2018 13:00:02 UTC, William Gothberg wrote:
>>>> On Thu, 20 Dec 2018 09:36:02 -0000, Jon Fairbairn
>>>> wrote:
>>>>
>>>> > "William Gothberg" <"William Gothberg"@internet.co.is> writes:
>>>> >> Agreed. All I can detect (with my digital camera) is that
>>>> >> one brand of LED light I have flickers about 5 times less
>>>> >> (not sure if it's smother or faster) than the others.
>>>> >
>>>> > Try a longer exposure and move the light rapidly relative to the
>>>> > camera.
>>>>
>>>> I wonder, if I fed the lamps with mains voltage DC, simply a bridge
>>>> rectifier and a huge capacitor,
>>>
>>> No they'd probbaly blow up, don;t forget a bridge recifir would produce a
>>> voltage of at leat 330V and the power dissapated by each LED would also
>>> increase .
>>
>> I thought about that, and the cheapest one, which seems to be just a
>> bridge rectifier straight to the LEDs, would make them 65% brighter. But
>> the others should only get 4% brighter. A switched mode supply fed by DC
>> at the peak voltage of the mains, would still have its bulk capacitor at
>> about the same voltage. It's already doing what I'm suggesting I do
>> externally. They're rated at 85-260V, so I assume they're switched mode.
>
> Not necessarily. Its quite possible to do a capacitor dropper powering
> a current regulator that way. Have a look a Big Clive's teardowns.
I've looked inside and I now know they are SMPS.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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