Recent content by rgbphil

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    Energizer 2AA ELMCL21L Cree Flashlight

    Hi, I just got one of these today, nice little torch. It'd be better if it remembered the brightness setting rather than always starting at max...but it's my first with a continuous adjustment, so I'm happy. Interestingly out of the box the beam was a little off center (not much, but enough to...
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    LED Rope Lights+Dimmers? XMAS time fun

    Hi, Now Christmas time is coming, stores have been stocking LED Rope lights. A red/green/blue/white/yellow set of ropes plus dimmers will make a nice simple colour changing setup. The question is will these simple ropes have problems in the long term with dimmers. I've seen people having...
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    New true free floating 3D Display Technology

    Be interesting to know to power consumption of that device.....0.1T for 100fS per pixel. And of course miscellaneous bits of particulate matter in the air being zapped will cause some sort of pollution. Still, it's pretty cool, though that picture of the guys head under the display must be a...
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    EULUMDAT, IES, LDT file creator wanted for Dialux modeller

    Hi all, I'm looking for a utility to create files in ies/ldt or dialux plugin format for the dialux modeller. I have the ies_gen3 program by Karba...however it only creates symmetric ies files. I need to model an Optiled 2W Dimmable with 60x10 degree optics. Any ideas? Thanks Phil
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    Regulation circuitry in LiIons

    re regulation v protection.....thanks for the info guys, I didn't know there were regulated batteries out there. I should have looked at the links the others provided. Sorry about the 'scare' tactics, like I said I've just gone through the process of selection for lion batteries for a...
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    Regulation circuitry in LiIons

    Hi Fallingwater, I've just gone through the process of selecting a lion battery for a design, and have a few things I've found. Firstly don't chop off the regulation circuitry, it's better described as protection circuitry. You're average phone or prismatic battery will have over/under...
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    Need help making LED driver unit v. automotive

    One important thing to do for automotive or in fact any long line driven app is to include transient protection. The automotive supply will have all sorts of little lightning bolts surging through it. Preferably transorbs or varistors (slightly cheaper) should be the first thing added, well...
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    RGB led baloon light ( large baloon )

    Oh....forget to mention in the previous post. If you have a wideish area under the balloon for the LED setup you might consider an array of superflux (or spider) LEDs as a cheaper alternative. About 3-4 of each colour (for 12-16 total) LEDs should be easily sufficient. Get the 120 degree, 100mA...
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    RGB led baloon light ( large baloon )

    Parrallel v Series....mmmmmm The reason some units operate in series is that they would probably be constant current converters....which is the preferred way to operate LEDs. Check carefully the type of controller you get matches the setup you want. If you connect a constant current...
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    RGB led baloon light ( large baloon )

    Hi Amonra, If you want each balloon to just have one colour at a time, you're probably better off with one of the other controllers the others have mentioned here. The chip I mentioned provides 5 channels of RGB...I was thinking of having a rotating pattern cycling of colours around each balloon...
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    RGB led baloon light ( large baloon )

    Warning....self plug! How high will the balloons float? This device: http://www.rgbsunset.com/cart.php?target=product&product_id=2&category_id=2 would be controllable via an IR remote and give multichannel control for some very interesting effects. A very small PCB with the chip, 5 RGB LEDs...
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    Lithium phone battery charger design....info needed

    Actually I was somewhat worried myself about how dodgy the result would be, but was pleasently suprised. I one of those magnifiers with lenses for both eyes, a head lamp on top (of my head....duh!) and a bright desk lamp. Looks like a borg when decked out, but you don't need a degree in...
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    Lithium phone battery charger design....info needed

    Thanks for the replys... The 10k device in question was on a cct board indeed placed jam packed close to the battery and right in the middle where thermal monitoring would be expected. None of the other SMD 'resistors' changed value with heat/cold at all, so I discounted them. The one in...
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    Lithium phone battery charger design....info needed

    Hi all, I was wondering if you could help out with a non-LED question. I'm designing a small device for a client and they want to use a Motorola Razr battery type BR50 internally. Current draw is quite minimal, but the device is semi-sealed so replacable batteries aren't an option. I've found...
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    Electro-osmotic micropropulsive LEDs

    An article from New Scientist on using LEDs to power microrobots around the body. http://www.newscientisttech.com/article/dn11386-diode-propulsion-could-power-microbots.html Imagine if the Red October had something like this.... PS: Really just wanted to put some fancy sounding words in the...
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