What's inside and how does it work?
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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This reminds me of a similar Harbor Freight light, which uses round LEDs in both locations. I have a couple of these, have not used them much, but did open one up to find that all of the LEDs are connected in parallel. The same holds true for their smaller round flashlights, and using one of those for a while I ended up with 3 of the LEDs failing. Not my idea of a good design! 🙂
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The OΩ resistors seem to just be acting as jumpers and nothing more.
When trying to identify a controller from its power and return lines(legs) you should check for under chip traces with a back light or continuity. Pin 3 looked like it had a trace running under the chip ? This chip isn't a PIC or Tiny.
Oh, and according to the B & Q description the 20 LEDs are 0.09 Watt each, so the total power is 1.8 Watt. So if we assume the voltage of the battery is 4.5 Volts then the current they pull out is 0.4 A. That is a pretty hefty load on a poor AAA cell (the 3 of them are in series, so the same current through all). I think we can safely assume that the LEDs will be OK regarding potential overcurrent, the internal resistance of the three AAA cells in series will be plenty of protection, no need for PWM. But as commented below, if someone suddenly has an engineering brainwave to replace the AAAs with 18650 the results may be interesting ….
Strange. At 6.20 you can see the emitter of the left-hand-side transistor is indeed traced to +vcc. But the right-hand-side transistor seems to have its emitter either hanging or traced to the collector! Optical illusion?
Did you check to see if it was PWM to the LEDs?
It is not a microcontroller there. It would be a nonsense. This might have been a dual jk flip flop or something similar.
Why a micro controller just for taking input from a button? One can achieve the same thing with a flip-flop… In fact I'd be rather annoyed to have a MCU sipping away the juice even when it's not in use…