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  1. H

    People who own both, what do you think of the H501 vs H50?

    I own both and definitely prefer the simpler, less fussy interface of the H50. If the H501 could be carried without being locked out (e.g., if it had a better recessed or stiffer button), I'd probably like it better, but as it is the H50 is the one that lives in my day pack. The strobe isn't...
  2. H

    H50b or H501

    I've not taken any measurements myself, and base the efficiency entirely on the manufacturer's specs: 2.3 hours at 66 vs. 96 Lumens, 3.5 days at 2.6 vs. 3.3 lumens.
  3. H

    H50b or H501

    I just got an H50 (not B) and an H501. I definitely prefer the narrower beam of the H501 and the (simpler) user interface of the H50. The H501 button is too sensitive to not lock it out when carrying it around, so in practice you have to twist the tailcap to turn it on anyway. The button...
  4. H

    Titanium Arc-AAA

    When I try to add the special CPF version of this this to my cart, it shows the $165 price. ??? Also, on Sunday I ordered an ARC6, with overnight shipping. It seems not to have shipped; can you advise whether you'll be able to get it out tomorrow (I leave for a trip on Thursday afternoon...
  5. H

    Puke inducing flashlight

    Not sure why, but I want one... http://blog.wired.com/27bstroke6/2007/07/homeland-secu-3.html
  6. H

    Worlds largest battery...

    Cool! I recall a getting a tour of the national fuel cell research center in Irvine a few years ago (which at the time I believe could claim the largest fuel cell array in the world). Even the resistor banks were a sight to behold. I love macro engineering.
  7. H

    L91, 14500, CR123 on a plane?

    I fly with similar stuff (usually an SF-CHROMA-MIL and lots of 123 type batteries and Li-Ion rechargables) in my carry-on, never gets a second look, even when it's entangled in a rats nest of cables. In fact, the only thing that seems to get their attention is (occasionally) is PC boards not...
  8. H

    Opinions on rechargable batt for GPS

    Man, everyone has one of those 60csx's (me, too). Great GPS unit. Another vote for Eneloops if you use it moderately often, Li-AA cells if it's going to sit in a backpack or glove compartment for infrequent emergencies. I get about 16 hours on a pair of Eneloops, with the backlight on (at a...
  9. H

    Bench Supply Recommendation?

    CC is "constant current". It's basically a current limit for the output. If the load tries to exceed the current limit you set, it will drop the voltage (down to zero if need be) to limit the current drain to the value you set. Or you can think about it the other way; the power supply will...
  10. H

    Bench Supply Recommendation?

    Well, the specs seem comparable to what you'd want in a good supply. I've never seen one (the HP/Agilents pretty well are the standard in these parts), so can't speak to how well they hold up. The smaller and lighter package is nice, assuming its rugged. One thing that seems to be a slight...
  11. H

    Carbon-Zinc Batteries - Still Useful?

    Actually, it's not clear to me if carbon-zinc chemistry is inherently more likely to leak that alkaline, but certainly I remember lots of "heavy duty" D-cells ruining the flashlights of my youth. None of the weird industrial carbon-zinc batteries I use have leaked, on the other hand/
  12. H

    Carbon-Zinc Batteries - Still Useful?

    In some very low-current applications, carbon-zinc cells can outperform alkaline in terms of energy density. (Though Li probably would outperform either, although that's available in fewer form factors). There are some battery form factors that to this day are only available in carbon-zinc...
  13. H

    Bench Supply Recommendation?

    Also, I'm not sure why you think the HP/Agilent E361x supplies are made in China. It's possible some of them are, but of the nine that are in my field of vision at the moment six are labeled as made in Korea and three are labeled as made in Singapore. Neither of those places, last I checked...
  14. H

    Bench Supply Recommendation?

    I have a stack of HP and Agilent bench supplies, mostly E3610As and a few 3611A's. Several have been powered on and under load almost 100% of the time for something like 12 years. I've never had anything go wrong with one. The 3610A is THE industry standard workhorse electronics lab DC bench...
  15. H

    Recommendations for good electronics books?

    My two favorites: The in-depth classic is Horowitz and Hill's Art of Electronics. The digital stuff is out of date, but it remains the best practical introduction to analog circuit design in print. Not for the squeemish, though. This is a serious, big, no-nonsense book aimed at engineers...
  16. H

    3M vs. Batteries.com Li battery patent case

    Ah. the story seems to have been updated since I posted it. Originally is said lithium, not lithium ion, and didn't say anything about laptop batteries. I guess this is more limited that I had thought it might be, and probably doesn't affect many of the cells we use here.
  17. H

    3M vs. Batteries.com Li battery patent case

    According to this Reuters story (which probably requires an NY Times free account to read), batteries.com just agreed to stop infringing a patent owned by 3M on some sort of Li battery technology. No idea what specific product(s) might be involved or what they are branded under...
  18. H

    Solar LED flashlight

    I see nothing contradictory here. Obviously the runtime depends on the capacity of the batteries and the depth of the charge. The web site says an 8 hour charge delivers 4-5 hours of light (but doesn't say what, if any, batteries are included in the lights shipped to consumers). 8 hours of...
  19. H

    Solar LED flashlight

    Haven't seen these discussed in a while, but I just noticed this NY Times article on the BoGo Light solar LED flashlight, engineered for extended use in areas without electricity. http://www.nytimes.com/2007/05/20/world/africa/20lights.html www.bogolight.com
  20. H

    Lithium D's...anyone use?

    Heating is a consequence if high (relative to other battery technologies) internal resistance. But I believe your cell is different from the cells in the original post (which are the ones I've used), and yours advertises LOW internal resistance, so this is clearly not an issue here. Edit: it...

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