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diode preset on driver

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can anyone tell me what type of resistor i should use on a 20x dvd burner diode, so i do not have to use the pot ohm. and can you tell me what type of resistor i should you on a blu ray diode
 

Zom-B

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The 'long die open can' diodes, those found in *most but not all* 20x burners have a sweet spot around 420mA. Using a 3.0 Ohm resistor will give it 416.67mA. I'm assuming you use the DDL driver.

For blu-ray diodes, it's a bit more difficult. Because individual differences between each diode, they have to be measured individually. Use a pot to bring the diode just at threshold level, measure the current using a mA meter, add 10mA to it, tune the driver to this new mA figure, measure the resistance of the pot and 4 ohm resistor and that is what you need. The target current is somewhere between 35 and 45 mA (38mA average)
 




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