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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



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Old 04-17-2015, 02:07 PM #1
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Default Little selectable test load I whipped up...

Nothing special, but it gets the job done.



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Old 04-17-2015, 05:13 PM #2
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Default Re: Little selectable test load I whipped up...

Looks good Gadget, good heat sinking. I bet it can handle more than 3A, at least briefly. How much did it cost for all the parts? I spent $24 on mine just because I didn't want to bother with making one myself. People need to know it's easy to make these and cheap if you make it yourself.

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Old 04-18-2015, 04:55 PM #3
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Default Re: Little selectable test load I whipped up...

Thanks!

Cost? Hmmm...I'd say it cost less than $9, looking at current prices of the parts and board material. I had a bunch of the parts already on-hand from scavenging dead electronics, though. Took about an hour to put together and solder up. MAN...those header pins are A BITCH to solder!! Kept melting the black plastic retainer! I finally said screw it and pulled the pins out individually to tin 'em. Anybody know a better way?

As for power, I've only had it up to ~2.4A. If I put a fan on it, it'll keep the smoke in for a minute or so, but I didn't linger there for very long as the N4005's are rated for less than half of that. The resistor is a 2W.
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Before you get yourself in trouble, read this!

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Projector, controller, fogger
Radiant X4 LPM
Two Eagle Pair 190-540 & 900-1700 OD4+ 20% VLT

Last edited by Gadget; 04-18-2015 at 04:56 PM.
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