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Old 08-11-2010, 12:45 PM #1
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Default Decoupling capacitor?

Looking around the site I have seen a few people solder a cap between the anode and the cathode of their 405nm laser diodes. After searching I found 47nf to be a common value with some of the drives. What i could not find was info about the flex drive. I want my 445 and 405 to last a long time so I was wondering should I add a cap? I know transient spikes can be very hazardous to the 405 but I was more worried about my expensive 445nm build.


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473nm 20mw BWB-10-OEM lab unit
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Old 08-11-2010, 02:12 PM #2
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Default Re: Decoupling capacitor?

Quote:
Originally Posted by midias View Post
Looking around the site I have seen a few people solder a cap between the anode and the cathode of their 405nm laser diodes. After searching I found 47nf to be a common value with some of the drives. What i could not find was info about the flex drive. I want my 445 and 405 to last a long time so I was wondering should I add a cap? I know transient spikes can be very hazardous to the 405 but I was more worried about my expensive 445nm build.
Decoupling caps don't do much for you except on startup transients on poorly made drivers. If you want real protection, get a Lasorb(tm)

LASORB - ESD absorber for laser diodes

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Old 08-11-2010, 02:37 PM #3
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Default Re: Decoupling capacitor?

The Flexdrive softstarts I believe, so your diode should be safe.
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Old 08-11-2010, 02:45 PM #4
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Default Re: Decoupling capacitor?

Quote:
Originally Posted by Bionic-Badger View Post
The Flexdrive softstarts I believe, so your diode should be safe.
That what I figured looking at the scope but I figured extra protection could not hurt. Is there any argument not to.
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405nm 31mw "<5mw" China Cheapie
405nm 71mw Samsung player harvest maglight build 115ma Flex Drive
405nm 223mw 6X Cree Build 210ma Flex Drive
445nm >1050mw 16850 Build 1300ma Flex Drive
445nm pen pointer ~20mw
473nm 20mw BWB-10-OEM lab unit
Way OverSpec 532nm 5mw Green (24mw)
532nm 82mw "50mw" Green
532nm 116mw Super Green Beast 100
635nm 46mw Pen Pointer with LM337 Driver
635nm 37mw Super Red Beast 006
635nm 235mw Mitsubishi Build
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660nm 109mw 16X Lab Bud Box Build 200ma LM317 Drive
660nm 249mw LOC Hotlights Build Flex Drive
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Old 08-11-2010, 02:46 PM #5
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Default Re: Decoupling capacitor?

Quote:
Originally Posted by Bionic-Badger View Post
The Flexdrive softstarts I believe, so your diode should be safe.
That what I figured looking at the scope but I figured extra protection could not hurt. Is there any argument not to?
__________________
405nm 31mw "<5mw" China Cheapie
405nm 71mw Samsung player harvest maglight build 115ma Flex Drive
405nm 223mw 6X Cree Build 210ma Flex Drive
445nm >1050mw 16850 Build 1300ma Flex Drive
445nm pen pointer ~20mw
473nm 20mw BWB-10-OEM lab unit
Way OverSpec 532nm 5mw Green (24mw)
532nm 82mw "50mw" Green
532nm 116mw Super Green Beast 100
635nm 46mw Pen Pointer with LM337 Driver
635nm 37mw Super Red Beast 006
635nm 235mw Mitsubishi Build
650nm 5mw Aluminum pointer
660nm 109mw 16X Lab Bud Box Build 200ma LM317 Drive
660nm 249mw LOC Hotlights Build Flex Drive
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Old 08-11-2010, 08:55 PM #6
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Default Re: Decoupling capacitor?

Quote:
Originally Posted by midias View Post
That what I figured looking at the scope but I figured extra protection could not hurt. Is there any argument not to?
Only if you want to modulate your beam at high frequencies. A capacitor will mess that up.
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