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Recent content by Grunff

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    When & where did the term 'host' originate?

    I've often wondered about this, but I've never seen a satisfactory answer. I have a lot of technical hobbies (electronics, computers, RC etc) where you have to house your projects in an enclosure. This is invariably called a housing, case or enclosure. It is never called a 'host'. Hand held...
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    Green Laser shined in my eye

    A single layer tent will absorb a small percentage of the energy (how much depends on colour and thickness), and scatter the rest into a wider beam. I would not want to use tent fabric as laser goggles, even at 5mW.
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    Does this look safe to you?

    Thanks, that's the handle I needed :-)
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    Does this look safe to you?

    I don't know much about best practices for laser shows, but I am uncomfortable watching this: 1000mw LASER - YouTube I recognise that the exposure time is very short, but you're still repeatedly getting zapped with 1W of 532nm. Am I being over-cautious?
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    Running a 445nm diode at 30mW

    Thanks - good point about the battery voltage dropping.
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    Running a 445nm diode at 30mW

    Hi all, If I want to run a 445nm diode at a tiny 30mW, is there any need for a driver, or can I just use a current limiting resistor?
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    Ebay modules - are they ever worth it?

    Thank you, that's good to know. Sadly those guys only ship within the US (I'm in the UK).
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    Ebay modules - are they ever worth it?

    I can live with 150mW sold as 200mW. What I don't want is a 50mW sold as 200mW :yh:
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    Ebay modules - are they ever worth it?

    I know this has been discussed before, but I can't get a feel for the consensus. Are these 200mW modules on eBay ever anything like 200mW of green output? Has anyone tested them? These are the things I mean: 200mW 532nm Green Laser Diode Module 3.7V-4.2V on eBay (end time 30-Mar-11 01:31:40...
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    Re: O-like 400mw green - $214 (hitting 600mw) - Review I really do! :) Wohoo!
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    Re: O-like 400mw green - $214 (hitting 600mw) - Review O-like have now removed the 400mW from their site altogether. I'd really like a 400-500mW 532nm. Any recommendations? I don't mind paying a bit more, as long as the output is genuine.
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    Smallest diameter collimating lens?

    It does make sense, I'm sure you're right. I'll order a projector and see what the array looks like.
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    Smallest diameter collimating lens?

    Fiber would be nice! I did wonder about the projector arrays, I've never seen one, so don't know what they are like.
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    Smallest diameter collimating lens?

    Thanks very much. The reason I want a smaller diameter package is that I'd like to build a 20 diode 30W total output head. My plan is to machine the head from a lump of copper rod, press the diodes into the back, and screw the lenses into tapped holes at the front. I could use the AIXIZ glass...
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    Smallest diameter collimating lens?

    Hi all, Can anyone tell me what the smallest collimating lens in a threaded housing is? I need to make a 445nm 1W in a smaller package than the 12mm AIXIZ. I can machine the housing, but I need a lens to use in it. Thanks!




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