View Full Version : Looking for Power Supplies...

09-27-2007, 06:05 PM
I am looking for power supplie(s) at least 50 watt. We're going to take a stab at making an LED light for the tank, and the power supply is probably the largest cost. If we could find a way to get those cheaper, we could custom make these things for way less then they are going for commercially (by we, I mean my husband).

I'm looking at you Joe.


09-27-2007, 06:23 PM
Judi, I made moonlight LEDs using cell phone power supplies. Each one powers 5 LEDs but could power more.

09-27-2007, 06:26 PM
The muffled response I got from the game room was "that won't power 1-watt LEDs, however." He's deciding between 1 and 3 watt (mumble mumble). Certainly something to think about for the moon portion, though :)

09-27-2007, 06:29 PM
any idea what voltage you want? 5v? 9v? 12v?

Trust me I have boxes of p/s here

09-27-2007, 06:36 PM
See I knew you wouldn't let me down Joe!! man he's all for giving me too much info tonight "they are actually 6.5v but don't worry about that, I can work with whatever. I prefer 12v."

I'd make him get his own account, but I'm cuter and easier to work with. And yes, that means I barely know what the hell we're talking about.

I think we'd start with one for a test, but then after that I might use you as a power supply supplier. Only you would have boxes of p/s :)

09-27-2007, 06:42 PM
Judi, I have some pages bookmarked on other computers that deal with building the LEDs. They also have sites that figure out what size resistors you need to step down the power. LMK if he needs them.

09-27-2007, 06:43 PM
Oooo yeah i'm collecting any links. Post em here and I'll force him to read them later. No hurry, just sometime when you're on the other machine.

09-27-2007, 06:45 PM

09-27-2007, 07:00 PM
if you do 12V make sure and sideline em with resistors

I can get you a box of assorted but I know I've got some 3 amps in there that should do the trick. as far as links

http://www.kaotica.com/frag/diy/moonlight/ this guy goes into slight detail but not much... uses resistors and has a schematic which helps

http://www.makezine.com/blog/archive/2007/07/fish_tank_led_moonlight_m.html yeah I read this mag, beauty is it's legit info!

http://www.cichlid-forum.com/articles/diy_moonlight.php why not go cold cathode instead??

http://www.allelectronics.com/ if it's not in my garage these guys will have it!

the cellphone charger not powering led's depends on how it's wired, what the charger is, what the LED's are. there are a ton of tricks out there. just remember I=V/R for the resistance calc and I=W/V for watt/amp/volt calcs (I is current btw) In theory before calculating the resistance into play one could power 12 1 watt LED's from a single 1 amp (1000ma) 12 volt power supply. My phone charger is 5v 890ma so you can sorta do the same math .890*5=4.45 my nokia charger will push 4 * 1 watt LED's

a nice site for helping figure what you need would be http://www.powerstream.com/Amps-Watts.htm

09-27-2007, 07:07 PM
why not go cold cathode instead??

just remember I=V/R

Thanks much, Joe! I'll get back to you on the power supply. Now you've got him all ramped up about looking into cold cathode. Says he's never thought of it because he wasn't sure of the light intensity. He's excited to read your link.

I got a grumbled "did you tell them I was an electrician" about the I=V/R. hehe. Guess I didn't :)

P.S. The variable for voltage isn't V, it's E

<- totally lost.

09-27-2007, 07:12 PM
P.P.S we're looking at high intesity LED lights to replace the entire light setup (day and night). 1, 3 and 5 watt bulbs. 10,000 kelvin. Mabye some 150watt Halides in the center. Like the bottom coral tank at Seascape, minus the $1800 price tag.

09-27-2007, 07:48 PM
finding high intensity LED's in that spectrum isnt that hard, Mouser http://www.mouser.com and Jameco http://www.jameco.com will have a huge selection in the catalog... the cost is more in housing it and making it look pretty as well as the programming, the Solaris does a lot more than light the tank. Larry knows a ton more of what the thing can do obviously.

The high intensity LED's that are used in units like that arent cheap either though, and wiring a full bank of em to work isnt as easy as one would think. If you go that route, good luck to you!

09-27-2007, 07:55 PM
I'll let you know how it goes, it's certainly a project that I know nothing about, hehe!! It sounds feasable, and you're right, the housing and whatnot are definitely more difficult, especially making it look good. I might compromise and just hide it in a canopy. I'm not sure :)

We haven't put much thought into the programming part yet. I'm not sure what he has planned for that. We probably won't do 5watts because of the cost, but I have no idea really. I was asked to start by trying to find a power supply.

I appreciate the links and might bug you about a power supply after he decides which one to go with for sure. I'm going to read up myself and try to figure out what's going on.

09-27-2007, 09:12 PM
if you decide to build take a close look at microchip and do a pic based rig, use a good quality triacs like linear tech or nat. semi.

I've got a ton of pic 16C745 chips on hand that I used for a project I was poking at a while back that have on chip USB, they've got em with on chip firewire and the whole bit. Maybe bank the wavelengths each to a separate driver maybe an allegro latched sink or something, use the RS232 from each pic to control the driver, USB to run the thing and a few I/O pins to allow them to speak to each other. Toss in a good flash disk for storage (simple cf card) and add separate voltage regulators for each bank and your golden!

(and I just noticed the pig and the "I'm looking at you joe")

09-27-2007, 09:26 PM
I threw the pig in there because he was darn cute (I just perused the smileys). Make the connection as you see fit :)

I heard some mumbling about linux and what not, so I will forward on your information. Your wealth of knowledge never ceases to amaze me. Hey! Aren't Pigs super smart, too? :piggy:

I think the piggy is mostly a substitution for not having a monkey smiley!

thanks again for all the great info. I will try to digest it now!

09-27-2007, 09:31 PM
mumbling about linux, why not go the real route and use BSD (I hate linux almost as much as I hate smileys). When we built coffeed to run the pic powered dorm bot we ended up scrapping the embedded linux and going with BSD as it just works (not to mention the fact that I've been using BSD for 12 years now... no reason there).

and for the record, wealth of something implies you have a lot of the same...

I know just enough to get by most times the reason I have so many of these stupid chips lying around is because I knew I would fry at least 6 best case and most likely 12 total building the dorm bot with my habits of jumping in blindly... We bought 15 extra...

I have 7 left....

09-28-2007, 09:43 AM
A lot of info on the LED builds and set ups over in RC.

09-30-2007, 08:48 PM
Here you go, Judi;







09-30-2007, 09:15 PM
Yay for links! We're still assessing the situation after many wise words from Joe. I will definitely look into those linkers tho :)