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>2A 445nm driver

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swshouse

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I need a variable driver for a test platform able to go up to 2 A for 445nm diodes. Size does not matter just function. Any suggestions? Computer interface/control would be a plus for graphing along with a OPHIR LPM.
 





ReNNo

ReNNo

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I'd recommend you LM350 and computer PSU.
It's the cheapest way.
 
kiyoukan

kiyoukan

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if you are worried about stable just add a 47uf cap and a .1uf cap to the end and that will stable the thing like a rock!
the 47 to hold back large spikes and the .1 to smooth out the small ones.
its a bit over kill but works great for everything not just lasers.
 
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swshouse

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kiyoukan said:
if you are worried about stable just add a 47uf cap and a .1uf cap to the end and that will stable the thing like a rock!
the 47 to hold back large spikes and the .1 to smooth out the small ones.
its a bit over kill but works great for everything not just lasers.
Click to expand...

thank you sir, I knew my $500 psu would be useful at some point.
 
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swshouse

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kiyoukan said:
if you are worried about stable just add a 47uf cap and a .1uf cap to the end and that will stable the thing like a rock!
the 47 to hold back large spikes and the .1 to smooth out the small ones.
its a bit over kill but works great for everything not just lasers.
Click to expand...

If a few caps to kill ripple and a bench psu work why does the following bother with a driver(has bench psu in one of the latter pics) http://laserpointerforums.com/f51/how-set-up-flexmod-p3-handheld-laser-56572.html#post798901
 
kiyoukan

kiyoukan

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well most of the users would not want to lug a nice large bench psu around. we use them to calibrate the output for the "best driver conditions"
Also bench psus are not that bad as far as their output goes.
Some have on and off spikes but they can be fixed and are generally the very old models.
Truth be told you dont even need a cap on a lm317.
I have one with no cap and its been running strong for over 7 months.
Heck if you want to be "stupid" i know a few people who direct drive their laser. with just 2 aa and their lasers is running just fine... for now. i still call that stupid but leaving a cap of the 317s is not bad.
 
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swshouse

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kiyoukan said:
well most of the users would not want to lug a nice large bench psu around. we use them to calibrate the output for the "best driver conditions"
Also bench psus are not that bad as far as their output goes.
Some have on and off spikes but they can be fixed and are generally the very old models.
Truth be told you dont even need a cap on a lm317.
I have one with no cap and its been running strong for over 7 months.
Heck if you want to be "stupid" i know a few people who direct drive their laser. with just 2 aa and their lasers is running just fine... for now. i still call that stupid but leaving a cap of the 317s is not bad.
Click to expand...

ok I think I have my answer now thank you. Now I just need to find a host for my LD that is easy to get at because I got a few hundred diodes to test..... any chance you got a suggestion for that as well?
 
HIMNL9

HIMNL9

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3355-himnl9s-crazy-generical-lab-type-current-sink-analog-modulable-laser-diode-driver-p.jpg


Adapt the values, and you can push it til 20A without problems ;)
 
kiyoukan

kiyoukan

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1nf is that the same as .1uf?
do you have a pcb for that. i have had problems with my stan ham drivers....
 
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HIMNL9

HIMNL9

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Right ..... 1nF = 1 nanofarad ..... 1uF = 1 microfarad (= 1000 nF)

I don't have a specific PCB, cause i made them with the shape i need, time by time ..... if you have dimensions and component types (SMD or discrete) i think i can draw one for you, if you need .....
 
millirad

millirad

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And even deeper into conversion factors...........

10−3 milli
10−6 micro
10−9 nano
10−12 pico
10−15 femto
10−18 atto
10−21 zepto
10−24 yocto

Never buy capacitors rated at one yocto farad.
:)
 
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