Recent content by jack_flash

Gather App
Inventry
Candle Power Forums

Help Support Candle Power:

  1. J

    German Members : 1 W Luxeon Light @Conrad

    First fool? This must be my part... - really white beam color - typ. low dome beam - maybe Chinese origin, but never seen there - convenient belt clip - dirt cheap, abt. 33 US-$ - clickie switch - regulated, claimed 2 hrs constant output
  2. J

    came across this 25 lumen led light, xenon too!

    Re: came across this 25 lumen led light, xenon too Looks really like an ARC plagiarism, esp. the PCB! Don't forget to add tax & custom fees. I'm in for a X11 for my collection. Ulrich
  3. J

    New 2-Transistor Current-Regulated Boost Circuit

    Re: New 2-Transistor Current-Regulated Boost Circu This is the "EDN"-circuit, built some time ago in mixed SMD-wired(weird?) technology, with rectifying. It contains SMD parts, but is never SMT... It works, and it fits in a bulb base.
  4. J

    New 2-Transistor Current-Regulated Boost Circuit

    Re: New 2-Transistor Current-Regulated Boost Circu Hello defremov, thank you very much! Somebody uses the 2SC2500,too - fascinating! I found this part searching catalogues for availability and data books at the same time. tomschrot, thank you for your schematic. However, push-pull means a...
  5. J

    New 2-Transistor Current-Regulated Boost Circuit

    Re:Original source for blocking oscillator design I'd like to see a regulated low power high eff two transistor push-pull converter, too... What kind of full wave rectifier? Bridge? In the meantime I'll give Tys design a try. Seems to be remarkable easy, so total eff (effort/benefit) will be...
  6. J

    New 2-Transistor Current-Regulated Boost Circuit

    Re: Original source for blocking oscillator design I really appreciate every circuit design with common available parts. For own projects, I have enough Zetex components, but it is not even easy to get them. This may be a concern for other skilled Flashaholics, too. However, for this circuit I...
  7. J

    Batteries in Europe

    I'd like to recommend Reichelt: http://www.reichelt.de/Info.html?PjfZ98N87IIAAFDImnE+Suche+0+50+NH%20MIGNON%20200 0+2000%20mAh 2000 mAh NiMH Mignon = 2.75 Euro For my own I prefer lower capacities, much cheaper and more experience...
  8. J

    Does anyone have this light?

    Novatec: I have it... Pros: + sturdy housing (stainless steel) + 1 AAA operation (alkaline: runtime up to 5 hours) + Easy to modify + perfect one key operation: * Pressing button short: Light stays on for 15 min max. (auto power off after warning) * Pressing button short 2nd time: Forces...
  9. J

    Simpler Constant Current Zetex Circuit (ZLT-CCR-2)

    Al, as mentioned earlier, there is a possibility wiring up the load in an other way: The common concept says, put the load (with or without diode...) between the connection from transistor Q and inductor L and ground. This has the benefit adding supply voltage and with L generated voltage...
  10. J

    Simpler Constant Current Zetex Circuit (ZLT-CCR-2)

    remuen, renouncing R1 from original ZLT-CCR circuit may cause a big problem: The ZXSC300 will never know current flow through the inductor and the right time to turn it off. IMHO this will not work. By the way, ZETEX offers a new part, the ZX3CDBS1M832. It includes T and D and seems to be...
  11. J

    Simpler Constant Current Zetex Circuit (ZLT-CCR-2)

    Thanks, remuen, exactly this was, what I liked to ask. Sure, range of V(in) is limited because of V(max, ZXSC300). But the big question is about efficiency in this case. And efficiency (risks) with (without) D and C(out).
  12. J

    Simpler Constant Current Zetex Circuit (ZLT-CCR-2)

    MrAl, I would try it, but at this time I have no demand for such a circuit: The 5 W emitters seem to be a ... (censored). They now claim a lifetime of 1'000 hrs. What's that? Is that the old value transformed to 50%*50% = 25% of it's initial brightness? Unbelivable... IMO, the big magic of this...
  13. J

    Simpler Constant Current Zetex Circuit (ZLT-CCR-2)

    IMHO an own emitter-resistor (R1) for every of the two transistors in parallel would be usefull. But in this case, only one of the resistors could be sensed. Thermal coupling of the transistors may help preventing run away currents through one of them. Small solder pads should do enough for this...
  14. J

    Efficiency of incandescent bulbs

    This $%#*$§$%#!! fortunecity webspace exchanges my pictures! That's kind of counterfeit. Any ideas avoiding this? If somebody is interested, I could email the chart.
  15. J

    Efficiency of incandescent bulbs

    camisdad, I'm sorry, but I'll use this chart in Germany... but you understood it very well ;-) Indeed, according to the above mentioned thread Alan marked these as obsolete: HPX22 2.2V 0.61A 12.3 Lumens HPX23 2.4V 0.70A 15 Lumens HPX42 4.7V 0.40A 27.5 Lumens HPX50 6.0V 0.47A 49 Lumens HPX51...
See more

Latest posts

Back
Top