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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



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Old 07-23-2010, 04:05 PM #1
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Default Using an 'old' LD as a test load.

Hi All,

I thought that if an LD was still conducting (forwards) or is now an LED, then it could be used as a test load.

Whilst experimenting with DrLava's new microboost v1 driver, I was using an old GGW-H20 as the load, the solder blob 'jumper' set the range to 540 mA - 1000 mA.

The minimum to which the pot would set the output at first was 498 mA, but then it jumped to 660 mA and stayed there whether the pot was turned all the way to the min, or the max.

I thought that I had broken the microboost drive. So I put a Rkcstr test load on the output, and the reading was now 320 mv (= 320 mA). I was able to turn it up to 9xx mA, so the driver was OK...

I have ordered a 12x sled from Rayfoss, and was setting the drive and host up to receive it. The driver is now set to 418 mA, this reading was confirmed by a multimeter reading the current in series with the test load, and another multimeter reading the mv across the 1 ohm resistor at the same time.

I wont be trying that again. The GGW-H20L was in a module at the time.

Best wishes

David


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