803T help

[wesdaman14]

ok im going to purchase a 803t diode.
i have a host heat sink all the stuff,but a diode and driver. i want the laser to have at least 120mw.
what driver should i get thats adjustable output?
and what is the mA to mw ratio ?? Thanks

 

[styropyro]

For a driver go with a rkcstr driver, for ease of use I would get a fixed driver instead of an adjustable one, his site is http://rkcstr.googlepages.com/lpf
If you want 120mW go with the 150mA driver. I wouldn't go much higher than unless you want to risk diode life.
There isn't a mW:mA ratio because the diode's power in to output isn't linear. For a good representation of power look at dr.lava's and Zom-B's graphs.

 

[daguin]

If you want 120mW go with the 150mA driver. I wouldn't go much higher than unless you want to risk diode life.

Four months ago people on this list were saying the very same thing about the magical 100mA barrier. I drive these well beyond this regularly and very successfully.

Peace,
dave

 

[Bionic-Badger]

You can get the adjustable driver too, just buy one of those dummy loads that rckstr offers on his site as well and measure the mA.

Hehe, I just turned up the power on my Kryton PHR-803T a smidgen and it is a bit brighter.

 

[wesdaman14]

Where do i find those graphs at ?? also i just bought a 803T assembled modual with a driver set at 170mA. how long should i run it ? and how long will it last ?
ill only use it about 10mins a day.and my heat sink is going to be about 4 washers put together.

 

[wesdaman14]

what is a dummy load, or test load ??

 

[Bionic-Badger]

Make sure you have it well heatsinked and it should be okay. Still, it varies from diode to diode. I think danguin even accidentally drove his at a full 300mA or so and it didn't blow it out; though I'm sure it didn't help its life expectancy.

 

[Glaserfan]

Go to Rkcstr's sales page, mentioned in his FS thread about the drivers. All the info you need will be in there

 

[Jimmymcjimthejim]

what is a dummy load, or test load ??

A dummy load is used instead of the diode to adjust the current going out of the driver.. So you don't accidentally blow the diode.

 

[jaap75]

Hi

I also have a question about the Rkcstr driver. Because my blue-ray diode arrived today and I didn't have the driver yet. But I did have a spare 400mA Rkcstr driver and some spare SMD resistors.

I wanted to drive my diode as close as possible to 100mA, And Rkcstr uses 2x 25.5Ohm resistors for that. But I didn't have these. What i did have where 2x 22 Ohm SMD resistors. So i calculated the following things:

2x25.5 Resistor in parallel = 1/Rv=1/25.5+1/25.5 = 12,75 Ohm
2x22 Resistor in parallel = 1/Rv=1/22+1/22 = 11 Ohm

Then I wasn't sure how to calculate the current for 11 Ohm so I did it the following way

(150mA) 3x 22.5 Resistor in parallel = 1/Rv=1/25.5+1/25.5+1/25.5 = 8.5 Ohm

12.75-8.5 = 4.25
150-100 = 50

So 50/4.25 = 11,76 mA increase per 1 Ohm decrease ( Does it make sense?)

So 11 Ohm would give me: 100+1,75*11.76 = 120,58mA ( Correct? )

I'm not really sure if this is the right way to calculate the current so that's why I'm asking. And 120 mA is a pretty safe current for a 803-t right?

Thanks, Yoeri