Fixing a faulty Temu light
Added 2024-04-24 00:57:44 +0000 UTCQuite an unusual fault that would have been hard to detect during testing.
These units are mass produced, extremely customisable and perfect for off-grid, power failure or apocalypse use. Or just to find your way to the toilet at night.
Comments
I've seen that video. Interesting company.
Big Clive
2024-04-24 22:18:32 +0000 UTCInteresting old neon not sure if this is the one you posted before but still worth a look https://www.youtube.com/watch?v=dVw_hitBBSs&list=WL&index=46
DC Allan
2024-04-24 17:25:18 +0000 UTCTypical voltage across the LEDs is around 2.8V so if you deduct that from the fully charged cell voltage (4.2V) it means the maximum voltage dropped across the resistor is likely to be around 1.4V which means that anything above 10 ohms can be quarter watt and lower values could be half watt. But the lights also have fairly low duty cycle too, so quarter watt should be fine for most applications.
Big Clive
2024-04-24 13:20:25 +0000 UTCSo cool. Thanks Big Clive! Such a tiny little error on that circuit board that could easily be missed by visual inspection I guess and an easy fix for your trained eyes. I like how you mention the pathway at night being lit as you walk. I have to admit here that I've been really into these things. I have four in the bedroom, three in the bathroom, one in the hall way and half a zillion in the kitchen! LOL Oh, one in the "office - clutter area" as well. It's almost like Blade Runner as I walk into the kitchen but sadly without the fade up. On a few of them, I've put a 24Ω resistor in series with the LEDs which only knock down the brightness a little bit but extend the battery life more than 3x. Quick perhaps obvious question, the current rating of the resistor is based on the overall power consumption right? I got a little buzzed and bought a bunch of 24Ω resistors ranging from 1/4 watt to 3 watts - Just, you know, to have them on hand, but I'm looking at the output and thinking 1/2 watt ones should be sufficient if I measure the power consumption of the LEDs?
Dave Frederick
2024-04-24 04:04:21 +0000 UTC
