italianboy,Reviews(3),Post(1),01/31/2009 |
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 Good buck driver
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Strengths:I received a new version of this board, with an AX2002 IC which gives 1A current (220 mOhm R1).
Weaknesses:The circuit is pushed above the chip's limits, and the efficincy looks to be a little lower than stated: a 270mOhm resistor would be more appropriate.
Summary:This circuit works great powering a Seoul P4 from a 6V battery, and it only gets warm after 5-10 minutes of use.
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,Reviews(2),Post(1),03/25/2009 |
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Great driver!
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Strengths:This chip is NOT over driven. Look in the datasheet for the AX2002, It states max 2A, so 1A is no problem at all. With a heatsink on the chip they are stable at 1,5A (Im currently using two at 1,5A)
It is also truly current regulated. It senses the current by measuring voltage over R2 which is in series with the led.
This is done via the FB pin on the chip. (same method as the older version PT4105 chip)
The AX2002 chip is quite robust as they are temperature protected and simply shut down when over heated, then turn on when cooler again.
They can also be dimmed using a resistor and potentiometer.
Good soldering
Weaknesses:-Hard to see where to connect led.
-Only one mode.
Summary:This is my favourite budget buck driver.
You can add dimming and temperature regulation with a thermistor.
Use voltage division to "steal" voltage from the R2 by placing a resistor between the r2 FB-pin. and. Feedback voltage to chip is 0,25V.
Search for Kennan driver on the candlepowerforums for instructions.
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,Reviews(1),Post(1),06/10/2009 |
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Great versatile driver
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Strengths:1A current is lots! Great versatility, even better now with AX2002v1.2 chip that can take 23V input.
Weaknesses:PCB isn't adequately labelled, no indication of where to solder negative wire.
Summary:Don't solder the negative wire to the PCB rim, that's the negative for the whole circuit. Pick up the 1A regulated current negative terminal at the end of the 220ohm resistor (little black thing that says R220) that is _not_ soldered to the rim, but is just next to the empty space for an absent R2 resistor. To reduce the current, put a (variable) resistor between the inner end of the R220 and the negative terminal of your LED(s) - most of the action happens in the 1 to 100ohm region, but still a glimmer of light at up to 100k ohms (for my application).
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suarez,Reviews(1),Post(1),06/23/2009 |
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works with P7
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Strengths:got 4 with little different resistor config. place for Led- still the same, so "dont worry" said Jerry. ;-)
Weaknesses:where to solder?
Look: http://fotos.mtb-news.de/user/view/148078
Summary:getting little hot, but Light out of a MTE P7 is as high as the original 2A "manufacturer Rating" Haha. Good enough if cooling ist a Problem. Otherwise the P7 Pulls out much more.
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Capo_au,Reviews(1),Post(1),09/15/2009 |
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Very Versatile Driver
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Strengths:-Great Price
-Can be modded so that it is dimmable
-Can be modded so that it has low voltage cutoff.
-If heatsinked can run up to 1.2A with 1.5A peak current for up to three led's (ie XR-E).
Weaknesses:-Very poorly labeled.
-Difficult to heatsink
-Difficult to mod (small components)
-Difficult to solder to, small contact points.
Summary:If your not afraid to get your hands dirty with a soldering iron then this is a very powerful driver for the price.
This isnt a driver for someone with little or no soldering experience however.
The driver is very small, around the size of your thumb nail.I didnt realize just how small until mine arrived. So its perfect for flashlight mod'ing.
For guide's on where to solder and how to mod + pictures of this driver head over to CPF.
http://www.candlepowerforums.com/vb/showthread.php?p=2895093
If you do intend to mod this driver I highly recommend ordering 1-2 more just in case you mess something up.
Enjoy
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