How with heatsink?

itsmei · Apr 17, 2011

Hi I a making about a 1.5W laser, I just want to know what size heatsink I should have for a long duty cycle. I want it to be on at 3min at a time. I am currently using an aluminium heatsink which is 10cmx4cmx4xm. I think this is too small. What size do you think I should have???

Thanks a lot for all ur help

DJNY · Apr 17, 2011

Also depends on the host you´re using.

If you wanna get long duty cycles, you should consider a copper heatsink. Mohrenberg has them cheap right now.

There are also a few tricks to get longer duty cycles, search for "coin mod" for example.

alf638 · Apr 17, 2011

Try this. If it is not enough you can sit it on a cpu heatsink or an alluminium/copper block.
The only problem with this is that it a labby heatsink. If you want a handheld try a guidesman. It can provide a 6 minute duty cycle.

itsmei · Apr 17, 2011

I am currently building a "lab Style" laser, so space is not a problem. I may actually have some copper lying around. What size do you recommend, i am using a LM317 driver so i will need to heatsink that too.

What size heatsink?

Thanks

BennyF · Apr 17, 2011

an old heatsink for a Computer power supply works great for me for my LM317 and I'm pushing about 1.2W so I'm sure it will handle 1.5W. It gets a little warm but works like a champ.

alf638 · Apr 18, 2011

itsmei said:
I am currently building a "lab Style" laser, so space is not a problem. I may actually have some copper lying around. What size do you recommend, i am using a LM317 driver so i will need to heatsink that too.

What size heatsink?

Thanks

Well as far as size and labbys goes, the bigger the better

.
I like to use a small to medium heatsink like the one I linked to and then sit copper or alluminium on and around it for extra heatsinking, and as was said earlier CPU heatsinks are great.

NetGod3Com · Apr 18, 2011

One of the large round CPU heatsinks from around the pentium iii era will work. They can often be found at any place that accepts computers to recycle. I recently acquired 2 for 5 dollars at a surplus computer dealer near me. One is copper core with aluminum fins the other was all aluminum.

itsmei · Apr 18, 2011

Ok thanks, I will see if I can get a nice finned heatsink off thesump or somewhere like that

How with heatsink?

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