Recent content by adrianmariano

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    Headlamp for close work (AA? COB?)

    All kinds of LEDs show up in dollar store products---you can find cheap non-COB lights as well. Its presence at dollar stores just means that low cost COB exists, not that COB is necessarily a low cost solution. Since COB appears to be more efficient and hence produce less heat, why...
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    Headlamp for close work (AA? COB?)

    Yeah, also not a fan of the non-replaceable battery. In addition to the longevity issue, you can't just swap batteries if you need to keep working. I don't have the impression that chip on board is "low cost" or inferior to other technologies. Am I mistaken? It seems like COB would be well...
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    Headlamp for close work (AA? COB?)

    I was recently doing a bunch of wiring and using zebralight headlamps (I have two that are pretty old---don't recall the models) and found that their lifespan was annoyingly short when run at a satisfactory brightness. They also got really hot. Recently I've seen a bunch of ads for a COB...
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    HIGH internal resistance eneloops

    When I checked the capacity listed was zero. And the voltage was still low. I tried shorting it with the good battery for longer and the voltage went up. And then I checked again...and now my charger is complaining about high resistance again. So it's not looking good. I also noticed that...
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    HIGH internal resistance eneloops

    It looks like four of the high resistance batteries got trashed. I had the one left that I pulled out of the zebralight. I measured it's no-load voltage and got something very low, like 0.15 V. I shorted it to a freshly charged eneloop. It was fairly slow to bring up the voltage---five to...
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    HIGH internal resistance eneloops

    I don't think my meter came with instructions. If it did, they were along the lines of "Insert batteries in the correct direction and don't operate under water". It's an unbranded model. It may show a scale going down to 0.00 mA but really only reliably measure signals that are significantly...
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    HIGH internal resistance eneloops

    I keep wondering if I should upgrade my multimeter. When I attempted to measure parasitic current I selected the mA scale and because the autoranging seems slow and flaky I selected the smallest scale, which showed 0.00 mA. It matters that the light is off because when it's on I get 325...
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    HIGH internal resistance eneloops

    So can I buy a buck circuit convertor or is it something that would be a component to solder onto a board? A reason I asked the question is that I found in my searches an adjustable voltage power supply, but it's advertised as being 3A at every voltage, so evidently when you lower the voltage...
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    HIGH internal resistance eneloops

    I've been using the light as a task light. I have it mounted on loc-line so I can position it. And it's constantly running down and I have to change the batteries. Can I buy a "buck circuit" device that's easy to connect to my power supply? Does it keep max current constant as it drops...
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    HIGH internal resistance eneloops

    No, regular eneloops, not Pro.
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    HIGH internal resistance eneloops

    I was measuring with batteries installed. But to close the circuit I need the tailcap to touch the body. Note also that this light uses tailcap touches to change brightness. I guess I don't know if brief power interruptions are all that's needed to signal the electronics to switch modes. I...
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    HIGH internal resistance eneloops

    Note that my meter is autoranging and has two current scales. For this particular test I had the meter on the amp scale. My intention was to determine whether a 1A power supply can run this light or not. The tailcap has the light's power switch, so it's not clear that I can omit the tailcap...
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    HIGH internal resistance eneloops

    I tried to measure current of my light in operation (not parasitic) as follows: I connected one lead to the spring in the tailcap and pressed the other lead against the back of the battery in the light. Then I tried to turn the light on...but nothing happened. No light. No current reading...
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    HIGH internal resistance eneloops

    Is there a way to check this with a regular multi-meter? I was actually thinking of trying to run a flashlight from a power supply and wondering what current it requires when it's turned on, but it's not obvious how to measure things since the light is closed up when operating. (The power...
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    HIGH internal resistance eneloops

    The battery could have been in the zebralight for 5 years. (I thought zebralight was decent!) But is drained the same thing as having high resistance?
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