Blue Moon

Reefkeeping, Coral, Fish and Invertebrates.

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ShagMan
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Post by ShagMan »

NiMH's definitely rock!

alkaline batteries are something like 600-800MAH.
-Josh Murrah
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KrazyPlace
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Post by KrazyPlace »

Snakeman wrote:Krazyplace , Young grasshopper has a question. If I use 4 AA battiers to get 6 volts how many MA Is that. Is there a way to see how many MA batteries produce. I want to do some flashlight project.
Snakeman...your not a grasshopper anymore! A mAh is a mA per hour. Theoretically a "D" Duracell battery will have 1.5V each and 15,000 mAh. The battery can discharge its power at various rates depending on the power consumption of the electronics. What that means is if you run 1 LED at 30mA then your battery will last 15000/30 = 500 hours (theoretically). More realistic is if you use 6 LEDs with 4 "AA" batteries (4x1.5V=6V, 3x2850mAh=11.4Ah) you should get 11.4Ah / (6x30mA) = 63.3 hours of run time. Not bad for a flashlight!

Try this link for a list of battery size vs mAh:
http://www.batteryspecialist.com/Mercha ... e=duracell
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Snakeman
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Post by Snakeman »

That is what I was looking for. Thanks Krazyplace.
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KrazyPlace
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Post by KrazyPlace »

How many LEDs are you going to use? There is a limit.
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KrazyPlace
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Post by KrazyPlace »

KrazyPlace wrote:I just received 50 white LED for $13 shipped. The same company sells the blue ones too. I'll post the email address tonight after I get home. You guys ought to go in together...save some money. Radio shack has a 12.6V 450mA transformer for $7.99. The higher amperages (1A, 2A, 2.5A) are about the same price. They also have a 25.2V version that allows up to 6 LED in series....makes wiring easier.
Scott wrote:Your running 3 in series on two parallel circuits? Have you measured the voltage output of the transformer?
Voltage is not split when the line is split. What I mean is that if you have a 12.6V source and you have 10 parallel lines, then each line will have 12.6V available. Now you have to subtract "used" voltage if you place the LEDs in series, that is why SnakeMan used 3 LEDs (3.4Vx3=10.2V + resistor).
Snakeman wrote:no. Every thing that I read said it didn't matter how my circuits you run as long as you do not go over your MA output. I think the Leds I got run on about 25-30Ma my tranformer can handle up to 600ma.
SnakeMan was 100% right...the limiting factor is the amperage of the transformer. Most LED use between 10-30mA depending on how many volts you run through them. If you assume 30mA then a 450mA transformer will power upto 15 LEDs. A 2A transformer will power about 66 LEDs.
The email address is cwithk@netvigator.com. I think they only sell 25, 50, 100 or more at a time, but email him and tell him what your looking for and ask for a price. The blue should be alittle more expensive, but not much.
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Snakeman
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Post by Snakeman »

I'm not sure, what is the limit?
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KrazyPlace
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Post by KrazyPlace »

I'm not sure! On that website it shows an approximate drain of 28mA for each battery, but that would be at the started mAh, therefore if you ran more the curve would be different, but I wouldn't think it would be much different. I think you can probably run twice the rating and still be OK. I think. Maybe. uuummmm? Not sure.
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Xster
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Post by Xster »

Hey Jason, i was wondering if you received any of the LED's yet? Just wondering...and absolutely in no hurry.
John
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Snakeman
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Post by Snakeman »

Haven't come in yet. It took a good week for my last ones to come in. I haven't checked the mail today so maybe they are in.
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Xster
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Post by Xster »

Hey Jason, how many LED's came in today?
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Xster
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Post by Xster »

Question answered, didn't see PM, duh.
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snoopdog
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Post by snoopdog »

Yeah my popup killer never lets me see my PM's. Ack....
"When they was no meat we ate fowl, when there was no fowl we ate crawdad. And when there was no crawdad to be found, we ate sand."--Cellmate
"You ate what?"--H.I.
"We ate sand."--Cellmate
"You ate sand?"--H.I.
"That's right."--Cellmate
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Snakeman
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Post by Snakeman »

Xster I just finished your lights. I hope they will not be too bright but if they are you can just put some duck tape over some of the leds. I'll try to get them to someone that can bring them to the meeting. Maybe you can try them out on Terrys tank so everyone can see how they look.
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Xster
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Post by Xster »

Thanks for everything Jason. :D Did I mention that "YOU DA MAN!" But anyways, hopefully you can send it via someone tomorrow to the meeting. Looking forward to see what it looks like. No doubt I am going to try it out on Terry's tank. :P :D

Whoever brings it, gets a free frag!! (my choice) :)
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tbmoore
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Post by tbmoore »

I hope so..I want to see them. I need to wk on mine and might build some...Wish you could bring them yourself.
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