DealToWorld:$2.99 18V 5W Cree Circuit Board for Flashlights (16.8mm5.5mm)

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18V 5W Cree Circuit Board for Flashlights (16.8mm5.5mm)

Price: $2.99

SKU: 3616

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- 1*Cree 5W regulated power output

- Output current: 1A with P4 emitter; 1.2A with Q5 emitter

- 16.8mm diameter base, 5.5mm overall depth

- Voltage: 3V-18V

- Fully regulated circuit design

Dimensions: 0.67 in x 0.67 in x 0.2 in

Weight: 0.07 oz

Quantity	3+ units	5+ units	10+ units
Price /Unit	$2.40	$2.30	$2.20

Reviews

Good buck driver
Posted by DrJones on 04-18-2010
Involvement: General (knows how to use it) - Ownership: 1 day to 1 week
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Pros:It is a good buck driver. Whenever you want to drive one LED with two or more cells (or some other voltage source up to 18V) and no modes, this one is for you. Efficiency is ~80%; Drives the LED at 1.2A.Might even drive multiple LEDs in series (I tried that, but not thoroughly).
Cons:Not a boost driver. Input voltage should be ~0.7V higher than LED voltage, or the current goes down significantly. So it's not suited for single cell operation.Gets warm a bit (not hot).1.2A is a bit too much for XP-E and XR-E LEDs.
Other Thoughts:The driving current can be changed by exchanging the sense resistor at the LED- wire (it's 0.20 Ohm; a higher resistance will result in a lower current).
Bottomline:Nice buck driver. I'll get some more.

Cheap led driver
Posted by Dofkee on 02-19-2010
Involvement: General (knows how to use it) - Ownership: 1 week to 1 month
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Pros:Item is good everything works. Even surprised that it is so small. It is very easy to connect. It is easy to change resistor if it is need. It is easy to change resistor if need to change. It works with 3 1.5 V batteries. Useful device and cheaper than building your own.* Small size fits easily into projects as well as flashlights
Cons:Probably of mail sender's side crashed the top of the coil sides. But this is nothing. Only problem is that the card is heating.
Other Thoughts:Diameter is 16.5-17 mmHeight is 3.8 mm
Bottomline:Value for money is good and really is a better option than the same solder such small details.

Super cheap driver
Posted by ecotack on 02-14-2010
Involvement: Novice (still getting used to it) - Ownership: more than 1 month
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Pros:It works on a single Li-ion or a 12v battery.It drives between 1 to 1.2A (depends on LED and power source)None have failed yetBoard diameter fits P60 drop-ins.
Cons:Gets a little warm
Other Thoughts:I have used these on a single Li-ion torch and also in out side lighting on 12v (for our stables). Since buying my first last year, none have failed. None of my Cree Q5s have burnt out yet either, but good heat sinks are needed at 1.2A.
Bottomline:Its a good cheap driver just to have around. I always keep a few in stock for those quick projects.If you do any torch mod-ing or are into efficient LED lighting, try these. Don't want to drive your LED at 1.2A, simply use 2 LEDs in parallel for 600mA each.

Good regulator PCB for 1-2A loads
Posted by isotco on 01-18-2010
Involvement: Expert (understands the inner workings) - Ownership: 1 week to 1 month
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Pros:These are good boards based on AX2002 step down converter chip.It is easy to modify their output current, just change the value on the largest resistor on the board or replace the same sense resistor with a pot.Uses adequate components like a SS34 for rectifying diode.Soldering is notably better than what I've seen on many other cheap regulators.
Cons:From what I've seen all AX2002 based converters lose efficacy if output current is set to less than 1000mA
Other Thoughts:Diameter is 16.5-17 mmHeight is 3.8 mmPreset current is 1.25A (0.2 Ohm sense resistor)PWM dimmable through pin 2 (EN)Really easy thing to do actually, just desolder a single SMD resistor and solder a wire for PWM inputTo calculate sense resistor value for a specific current you use the formula 0.25/I = RExample: If I want 1.5 A output current I calculate the sense resistor value like this, 0.25/1.5= ~0.17 ohm sense resistor.Datasheet:http://www.axelite.com.tw//Products/AX2002-V1.4-20090212.pdf
Bottomline:Excellent regulator, very easy to use and offers efficient, robust operation.