setting a driver

[midnighttattoo]

I have a Cajun lasers dummy load.
If I need to set a driver for a 405 diode that needs 5.5v would I put the jumper on 5 or 6? because the mv out put is different for either one.
I hope im not getting this totally wrong..

 

[scumbagatheist]

Hey, MT. Do you have one of the Jufran loads? (the purple one w/10 diodes)
What output are you wanting to run the 405nm at?

You want your voltage reading, when measuring at the test load leads to run as close to, or just over 6V. I seem to remember using jumper number 7 or 8. I cannot remember.

Just make sure your voltage to your diode leads is as close to 6V as possible. Then, you can adjust your voltage accordingly.

 

[midnighttattoo]

thanks mate I wanna set it at 450 m/a
this load have voltages printed on it
Purple with ten diodes cliff said the numbers were the voltage .Im not sure if its the same as a Jufran one.

 

[scumbagatheist]

Ok, I'm not seeing it listed on the site anymore.

The numbers printed are not voltage numbers, but diode numbers.

There is only one accurate way to set them, while accounting for load, heat, etc., and that is to measure the voltage at the LD leads on the test load. Only then can you accurately set your driver's current.

 

[midnighttattoo]

Ok, I'm not seeing it listed on the site anymore.

The numbers printed are not voltage numbers, but diode numbers.

There is only one accurate way to set them, while accounting for load, heat, etc., and that is to measure the voltage at the LD leads on the test load. Only then can you accurately set your driver's current.

ok nice one thanks
nah the advert is gone it said on there how many diodes to use for what

 

[scumbagatheist]

I seem to remember it being Jufran's (member here). It's a very sexy test load, and mine has been used dozens of times.

It took me a while to get accurate readings. It was Lazereer that helped me with that missing piece of magic that made my driver setting days sooo much easier.

Now days, I'm either using a PSU and DMM to do my settings, or just 2 DMMs and a charged set of batteries.

 

[midnighttattoo]

are u testing in series with the live like that. with the diode connected?
diode side?
Honestly I think I may be too thick for this hobby lol
so measure the voltage where the leads go into the test. then move the jumper till it reads the required load voltage.
so I need to power it down every time I move the jumper.

 

[scumbagatheist]

Never ever adjust a driver with a diode attached to it!

Hook you LD out leads from your driver to the appropriate leads on your test load. Apply power.
Then use your DMM to measure voltage at those leads. You want 6V. You can adjust the jumper settings whilst applying power.
Once you find your voltage reading, you can then attach your DMM to the measurement leads to get your driver's output current readings and adjust accordingly.

I know it's daunting at first, but once you get it, you'll know it and wonder how you were so dumb before. This method solved all of my woes.

 

[midnighttattoo]

Never ever adjust a driver with a diode attached to it!

Hook you LD out leads from your driver to the appropriate leads on your test load. Apply power.
Then use your DMM to measure voltage at those leads. You want 6V. You can adjust the jumper settings whilst applying power.
Once you find your voltage reading, you can then attach your DMM to the measurement leads to get your driver's output current readings and adjust accordingly.

I know it's daunting at first, but once you get it, you'll know it and wonder how you were so dumb before. This method solved all of my woes.

I get you and that's what I thought you meant
thanks you are a legend