Recent content by andersonEE

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  1. andersonEE

    Suitable LED type for saltwater aquarium?

    Like Evil said...you should replace those 15ohm resistors with 2ohm resistors. With good airflow (saw the fan) your heatsinking looks ok...it depends on how well those aluminum bars are connected to the outer housing. Monitor temps for awhile to verify.
  2. andersonEE

    Fixed Indoor lighting with Cree XM-L LED's

    You can improve the CRI of your light by mixing LED's (usually cyan and red Leds mixed in with neutral or warm whites). However, high CRI with LEDs is a fairly complex topic...do a search in this forum for "high CRI mixing LEDs" ...you'll see what I mean. It might be easier to just purchase High...
  3. andersonEE

    Fixed Indoor lighting with Cree XM-L LED's

    A few things to consider: 1. Many people prefer a high CRI lightsource in the bathroom because it renders skin tones much better. (If you have a wife or girlfriend who does makeup, hair, etc. in front of the mirror, this is especially important). The warm white XML's have a CRI of 80 I believe...
  4. andersonEE

    Where to get Arctic Alumina?

    I usually get mine from Newegg http://www.newegg.com/Product/Product.aspx?Item=N82E16835100013&Tpk=arctic%20alumina $7.95 free shipping
  5. andersonEE

    "Eco-Star" Quad XM-L U2 @ + 4000 lumens - beamshots added

    Re: "Eco-Star" Quad XM-L U2 @ + 4000 lumens I can't see the pictures...just me?
  6. andersonEE

    Technical driver question?

    If you search for "buck converter" and look at the wikipedia article about it, you can read about the role of the inductor in the buck circuit...which is what it is doing in that board you linked to.
  7. andersonEE

    Mixing Dell Bricks and Bridgelux LEDs, any thoughts?

    This is true. The constant 20V is correct for a regulated laptop power brick, but for a typical wall wart power supply rated at say 12V, you might get 15V unloaded and 10V if you load it up.
  8. andersonEE

    Mixing Dell Bricks and Bridgelux LEDs, any thoughts?

    Yes, I was just giving an example so egghead would understand how to do the calculations and choose the correct resistor.
  9. andersonEE

    LED flood light

    Multiple Cree XML's (1000 lumens each). You could also look into Bridgelux Leds. Hard to give more info without details on what the light is for, how you will power it, etc.
  10. andersonEE

    Mixing Dell Bricks and Bridgelux LEDs, any thoughts?

    I always enjoy your build threads...can't wait to see these new outdoor setups. Sounds like you understand it now. One thing to note: The 6.2Volt BXRBs are the LS series, which is currently unavailable at Digikey and Newark (they are listed but have an availability of 0). The only available...
  11. andersonEE

    Mixing Dell Bricks and Bridgelux LEDs, any thoughts?

    Haha...I read through your first post again...just to clear something up: If your power supply is 20V, you would want to run 2 10V Led's in Series, not in parallel. Similarly, if you ran 3 N1203's (19.8V) in series, you would need a power supply that could output 59.4 Volts. What you want to do...
  12. andersonEE

    Mixing Dell Bricks and Bridgelux LEDs, any thoughts?

    Ok, after reading your first post, it seems like you may be confused about circuit theory. Before you do anything, make sure you understand Ohm's law (V = IR) where V=voltage, I=Current, R=Resistance. It would also be good for you to learn Kirchhoff's Current Law and Voltage law (Search for...
  13. andersonEE

    Mixing Dell Bricks and Bridgelux LEDs, any thoughts?

    FYI, the BXRA line is now old news...you can get the new BXRB leds from Digikey. Better efficiency, >90CRI, etc.
  14. andersonEE

    Home Brew MTG Based MR16

    What 12V AC charger are you using? Are you sure it is rated for the amount of current you are trying to pull? Can you post a picture of your setup?
  15. andersonEE

    Home Brew MTG Based MR16

    The Nuventix Synjet MR16 Cooler runs off 4.75V to 5.25V (nominal 5V) and draws 360mA. The MTG Vf at 1100mA is 5.6V. You could design The LM3401 to output 1460mA and then wire the Cooler and Led in parallel on the output. You would have to add a small resistor inline with the Cooler to bring its...
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