Old 09-09-2014, 01:17 AM #1
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Default need help! 300mw 635nm

:wave so recently I made a host for a 635nm 300mw laser I have coming I don't have the diode yet only the driver when I powered up the driver with a 3.7v lithium ion I measured with the multimeter and it said it was outputting 6.94v, is that right? I asked the seller on ebay he said the voltage would drop when I connect it to the diode I know it will but will it drop enough? or will the diode break?


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Old 09-09-2014, 01:30 AM #2
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Default Re: need help! 300mw 635nm

that is why we use test loads, The diode itself is a source of resistance. Make sure you short out the diode contacts on that driver before you connect the diode. Most drivers hold a charge and not doing this will instantly blow out your diode.
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Old 09-09-2014, 03:33 AM #3
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Default Re: need help! 300mw 635nm

thanks for your help
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Old 09-10-2014, 05:49 AM #4
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Default Re: need help! 300mw 635nm

You can kill your driver by running it without a test load btw, especially if it's a boost driver. The driver will boost to whatever voltage it needs to in order to drive the current through the load's resistance. If the resistance is very high (e.g. air open circuit or DMM set to measure voltage) then the voltage boost can be so high that it basically fries the components from the inside out.
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