I was playing with one of those "filament" LED lamps. I noticed it seemed to flicker a bit...so I tried powering it with different things to try to extract information about it - noticed it seems to be 100% LED - no droppers, no PSU, no rectifiers, nothing - the LED "filaments" are hooked straight to the contacts!
Wondering what's the distribution of how "filament" LED lamps are driven? Do any have capacitive droppers? rectifiers? CC PSUs?
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Found another "filament" LED that does have a PSU in it, seems to be a capacitive dropper type, possibly CC as well. Runs better than the first one - does not flicker.
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On another note, found a little multichip LED (has 24 1206(I think) SMT LEDs in it on two crossed PCBs) all in a unit about 1" long and ⅜" diameter (12VAC/DC, about 1W dissipated) that contains its own tiny switching PSU in it, can see a SOT23-5 IC(?) and a coil in it, and of course rectifier diodes. All embedded in silicone. Wonder how much these cost to make...
Wondering what's the distribution of how "filament" LED lamps are driven? Do any have capacitive droppers? rectifiers? CC PSUs?
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Found another "filament" LED that does have a PSU in it, seems to be a capacitive dropper type, possibly CC as well. Runs better than the first one - does not flicker.
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On another note, found a little multichip LED (has 24 1206(I think) SMT LEDs in it on two crossed PCBs) all in a unit about 1" long and ⅜" diameter (12VAC/DC, about 1W dissipated) that contains its own tiny switching PSU in it, can see a SOT23-5 IC(?) and a coil in it, and of course rectifier diodes. All embedded in silicone. Wonder how much these cost to make...
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