bdr-209 test load

I want to make a test load for a blu ray bdr-209. I am looking for a circuit that shows how to make it because the only circuits I found are for the lower power blu ray diodes. I may buy this: Heavy Duty Test Load Kit for Laser Diode Driver 3000mA | eBay to make the bdr-209 test load after a find a circuit for it. If anybody knows the test load circuit for this diode, I would appreciate a reply because I don't want to use the wrong test load by mistake.

If you're looking to buy an adjustable test load, look Here, this is a very good test load from a member here (Jufran88), that you can buy either as a kit, or fully assembled.
The kit version is about the same price as the one you're looking at on ebay.

BowtieGuy said:

If you're looking to buy an adjustable test load, look Here, this is a very good test load from a member here (Jufran88), that you can buy either as a kit, or fully assembled.
The kit version is about the same price as the one you're looking at on ebay.

Click to expand...

Thank you for the reply. I just don't know how many diodes to use on the test load because I don't know what the voltage drop of the bdr-209 is.

thebouljello said:

I want to make a test load for a blu ray bdr-209. I am looking for a circuit that shows how to make it because the only circuits I found are for the lower power blu ray diodes. I may buy this: Heavy Duty Test Load Kit for Laser Diode Driver 3000mA | eBay to make the bdr-209 test load after a find a circuit for it. If anybody knows the test load circuit for this diode, I would appreciate a reply because I don't want to use the wrong test load by mistake.

Click to expand...

The test load you looking at will work for bdr-209. You will need to use all diode to simulate the voltage drop of BDR209 diode. Please notice that the Vdrop of the test load and LD will varies with current so they may not exactly the same.

What is your target current of running the diode?

Assuming you are going for 600mA, the voltage should be 6.5V, use 8 diodes on the test load.

Alan

Pi R Squared said:

Assuming you are going for 600mA, the voltage should be 6.5V, use 8 diodes on the test load.

Alan

Click to expand...

Thanks Alan.

You should try it with a few different numbers of diodes set in series though. The point of a good driver is to supply constant voltage regardless of the exact forward voltage, so adding/removing one or two diodes around the nominal voltage should be possible.

Also, beware of wire-wound resistors, as they make very inductive loads. I've seen practical examples of those messing with some drivers. If possible, get a low-inductance resistor instead (they are available in this power range, but can cost a bit more. You could always put a number of 'standard' resistors in paralel if you don't have to worry about how much space they'll take up).