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Old 03-16-2012, 01:43 AM #1
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Default Micro Boost Driver Calibration help

I am currently trying to build a 405 laser pointer I have a

Micro BoostDrive DC/DC Converter Portable Laser Driver
Ultrafire 14650 battery

I am yet to order the diode or the lens. I wanted to make sure I could calibrate the driver properly before spending a good portion of money on a diode.
Thus we come to the problem. I hooked up the driver to a test load of six lN4001 diodes and a 1 Ohom resistor in series to my driver. The driver is set to 390-750 mA. When I attach the 14650 battery the reading I obtain across my load resistor is 20-40 mA depending on where the pot is turned to.

Any suggestion as to why my output current is low. I'm sorry I cannot supply any pictures I do not have a camera that would be able to take a picture worth posting.

Thank you for any suggestions you may be able to offer.


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Old 03-16-2012, 01:55 AM #2
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Default Re: Micro Boost Driver Calibration help

There are some set resistors in the back and you must solder a bridge corresponding to the output you want. Make sure you do a good job soldering that as those are tiny resistors that could easily come off with your soldering iron. Check the boost drive datasheet for the correct solder bridge
Hope I could help

And I see it's your first post too so,
Welcome to the forum enjoy your stay, learn something new and be safe

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Old 03-16-2012, 02:07 AM #3
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Default Re: Micro Boost Driver Calibration help

You won't need to solder on the smaller resisitors as the previous post suggested for that range. It is a really easy one. There is one large resistor on the back and a contact area next to it. Bridge it with solder according to the yellow line in this picture.


Last edited by DTR; 03-16-2012 at 02:08 AM.
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Old 03-16-2012, 02:13 AM #4
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Default Re: Micro Boost Driver Calibration help

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Originally Posted by DTR View Post
You won't need to solder on the smaller resisitors as the previous post suggested for that range. It is a really easy one. There is one large resistor on the back and a contact area next to it. Bridge it with solder according to the yellow line in this picture.

I'm not too familiar with that driver so you should take DTR's suggestion. Sorry for giving you the wrong info..... Thanks for correcting me now I know


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Old 03-16-2012, 02:37 AM #5
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Default Re: Micro Boost Driver Calibration help

I have soldered the bottom resistor shown in your post and yet it is still only giving me a range of 20-40 mA. Thank you for the suggestion DTR and AnthoT.
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Old 03-16-2012, 02:42 AM #6
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Default Re: Micro Boost Driver Calibration help

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Originally Posted by ncm View Post
I have soldered the bottom resistor shown in your post and yet it is still only giving me a range of 20-40 mA. Thank you for the suggestion DTR and AnthoT.
It could be the test load but that sounds like it is still in the first mode. You are sure the solder bridge is making good contact?
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Old 03-16-2012, 02:56 AM #7
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Default Re: Micro Boost Driver Calibration help

It seems to be a good connection but I will try to borrow a camera tomorrow so I may post some pictures of both the test load and the driver, Thank you again.

Last edited by ncm; 03-16-2012 at 02:58 AM.
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Old 03-16-2012, 04:32 PM #8
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Default Re: Micro Boost Driver Calibration help

With a closer inspection using a magnifier one of the resistors was shorted to ground with a small speck of solder causing the micro boost driver to look as though it was in the first mode. Thank you again for all your help
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