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Old 07-14-2011, 08:13 AM #17
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Default Re: Planned IR Handheld Build: Driver?

I could have sworn I have tried that before... you're sure that works?


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Old 07-14-2011, 04:56 PM #18
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Default Re: Planned IR Handheld Build: Driver?

Yup. I tried it with an lm317 and a LED.
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Old 07-14-2011, 07:33 PM #19
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Default Re: Planned IR Handheld Build: Driver?

Huh. I guess I will try it later and see if it works.
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Old 07-14-2011, 09:50 PM #20
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Default Re: Planned IR Handheld Build: Driver?

Hmm. So I tested it out... you are totally right, man.
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Old 07-16-2011, 04:09 PM #21
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Default Re: Planned IR Handheld Build: Driver?

i just bought 6x of these IR drivers pretty sure they are setup for case positive jobbys....will be using them on a whole bunch of 780/808/980nm diodes i have sitting here
808nm 100-500mw Laser Diode Driver Constant current (eBay item 220782110372 end time 09-Aug-11 02:40:47 AEST) : Business Industrial
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Old 07-16-2011, 05:56 PM #22
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Default Re: Planned IR Handheld Build: Driver?

Yeah, but I need 1.3A Decided to build a DIY LM1117 driver.
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Old 07-17-2011, 12:25 AM #23
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Default Re: Planned IR Handheld Build: Driver?

fair enough, im just going to run 2 in parrallel (3x space permitting) to get the desired current
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Old 07-17-2011, 07:00 AM #24
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Default Re: Planned IR Handheld Build: Driver?

That's exactly what I did!
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Old 07-30-2011, 08:05 AM #25
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Default Re: Planned IR Handheld Build: Driver?

oy i just parrelled 2 of these drivers and the current didn't double?

do you know what would be going on there?

BTW this 9mm 808nm is intense in a handheld
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Old 07-30-2011, 08:00 PM #26
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Default Re: Planned IR Handheld Build: Driver?

You have to build the circuits separately. You can't use the same sense resistor, etc. I tried that at first and it didn't work. You have to build, quite literally, a duplicate of the circuit and just connect the outputs and inputs.
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Old 07-31-2011, 01:35 AM #27
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Default Re: Planned IR Handheld Build: Driver?

hmmm fair enough, i LPM'd the build atm and it was doing like 150mW which i thought was too low for what im putting in.

Maybe them both in parrallel means that they are 'fighting' each other.

the beam is visable to my night vision at this power which is nice but i think it can be pushed a lot more with a bigger driver.

have you built one yet?
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Old 07-31-2011, 06:36 AM #28
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Default Re: Planned IR Handheld Build: Driver?

Yeah - my IR laser (with this driver) works fine.

Basically, just build two of the circuits, each with an output of 650mA (at least for my diode), and then just connect the inputs and outputs. And make sure you have enough overhead, because you are gonna need a lot of overhead for this setup.
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Old 07-31-2011, 07:16 AM #29
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Default Re: Planned IR Handheld Build: Driver?

interesting....wanna build me 1 or 2?
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RGB - 400mW (1)

In Progress:
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Old 07-31-2011, 11:19 AM #30
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Default Re: Planned IR Handheld Build: Driver?

if you use a LM317T constant current driver style:


Vref/R1 = Iout

1.25V/1ohm = 1.25A.

Look alright?

then for the power dissipation would be IxV so Vref x Iout = 1.5625W's

therefore use a 2W 1ohm resistor?

Any problem with that?
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405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
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637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
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Old 07-31-2011, 03:09 PM #31
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Default Re: Planned IR Handheld Build: Driver?

Well, the problem is that we are trying to use LM1117s and use it current sink style. Here, lemme draw you a schematic of what I mean.
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Old 08-01-2011, 05:43 AM #32
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Default Re: Planned IR Handheld Build: Driver?

yeah, i couldn't find a negative regulator on Multisim so i used its positive regulator equivalent.

if i use one of these: LM337T Negative Adjustable Regulator 1.5A

i should be sweet?
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Last edited by Fiddy; 08-01-2011 at 05:44 AM.
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