Old 12-13-2012, 01:53 AM #17
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Default Re: A little help with this

Rechargable lithium ion batteries.

Ofcourse, they'd neccesitate the use of a flashlight body to hold it all together since I didn't see any square looking, or desktop friendly lithium ions around.

But they are rechargable, last brutally long, charge in no time, excellent current capabilities.


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Old 12-13-2012, 02:21 AM #18
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Default Re: A little help with this

Oh hey and about the aixiz module, there are two sizes 3.8mm and 5.6 which suits me best?
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Old 12-13-2012, 12:19 PM #19
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Default Re: A little help with this

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Oh hey and about the aixiz module, there are two sizes 3.8mm and 5.6 which suits me best?
The LPC-826 fits the 5.6mm aixiz module. What do you plan on using as a host?
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Old 12-13-2012, 03:35 PM #20
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Default Re: A little help with this

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And i would like to get around 250mA for 150mW so V=I/R
R=5
The formula is V = IR ! (or I = V/R, or R = V/I) Im guessing it was just a typo though, as you calculated the resistance correctly?
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Old 12-13-2012, 08:13 PM #21
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Default Re: A little help with this

I dont know what im going to use as host but i think ill just put it inside a flashlight or just a little box/case.

And yeah the V=I/R was a typo, forgot to edit it

OH and how do i short the driver? i just read that if i dont there is a chance it might die

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Old 12-13-2012, 11:04 PM #22
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Default Re: A little help with this

I suggest a ceramic capacitor, they won't burn your diode if you don't short the leads before running it. They have a very low charge.


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Old 12-13-2012, 11:29 PM #23
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Default Re: A little help with this

What you probably mean is,

Shorting the output capacitor.

It's as simple as crossing the leads that are supposed to go to the diode for a second.

This is to discharge any residual charge left in the capacitor, and make it safe to connect your diode to the output.
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Old 12-14-2012, 07:00 PM #24
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Default Re: A little help with this

Oh I forgot to ask the lens on the copper aixiz module is it okay for this laser?(won't melt or anything)
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Old 12-15-2012, 12:05 AM #25
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Default Re: A little help with this

You don't need an output capacitor, and it can even hurt your circuit as it'll affect your circuit as a constant current source. That diagram is very old and the idea at the time was that you'd be filtering transients at the output; however, the voltage regulator does an excellent job of rejecting problematic voltages/currents. If you put the capacitor anywhere, put it before the voltage regulator.
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Old 12-15-2012, 02:28 AM #26
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Default Re: A little help with this

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What you probably mean is,

Shorting the output capacitor.

It's as simple as crossing the leads that are supposed to go to the diode for a second.

This is to discharge any residual charge left in the capacitor, and make it safe to connect your diode to the output.
exactly, thats what I meant to say, mabe english fail.

No need to do that with ceramic capacitors
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Old 12-15-2012, 02:32 AM #27
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Default Re: A little help with this

If it's a capacitor in any way,

Yes, you need to do that. If you didn't, it wouldn't a capacitor.

But I'd go with the other advice of even ditching the capacitor altogether if it's a problem.
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Old 12-15-2012, 03:41 AM #28
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Default Re: A little help with this

their capacitance is too small to burn a diode. I bet all my m140s, they wont burn
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Old 12-15-2012, 08:10 AM #29
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Default Re: A little help with this

You can never be too careful. Better safe than buying another diode.

Besides, I've seen some really high capacitance small ceramic SMD caps, like 10uF, two in parallel was all I needed in some switching driver design for the output cap.
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Old 12-15-2012, 09:16 AM #30
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Default Re: A little help with this

@OP What lens and module are you going to be using? And if you need more ideas on easy to build laser drivers here is a nice PDF with some (see attachment). The LM2941 driver in the PDF works great with two Li-Ions, running my lpc-826 at 510mA with 7.2V!!!
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Old 12-16-2012, 01:27 AM #31
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Default Re: A little help with this

I am planning on buying a 5.6mm copper aixiz module and no idea what lense
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Old 12-16-2012, 06:23 AM #32
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Default Re: A little help with this

Go to DTR's site and buy the lens that says "635nm-660nm AR Coated Three Element Glass Lens". If you are sure that the module you are using is an aixiz module then this lens will work great!
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