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Old 08-31-2011, 03:31 AM #33
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Default Re: Buck Converter Feeler?

I've tested my personal driver (using it in a build) all the way up to 2A or so, after changing the SS diode. That's the only part holding it back! :O

EDIT: And looking back it on, that looks like what it is limited to... it seems that IC is rated for 2A. XD



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Old 08-31-2011, 03:36 AM #34
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Default Re: Buck Converter Feeler?

ahh, i see thats what I was wondering. Do you have to use those resistors or can you put any on there that will fit? even through hole ones.
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Old 08-31-2011, 03:55 AM #35
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Default Re: Buck Converter Feeler?

Naw, you gotta use those resistors :\ Hard to hand solder, I will tell ya that much.
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Old 08-31-2011, 03:57 AM #36
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Default Re: Buck Converter Feeler?

why do you NEED to use those resistors?
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Old 08-31-2011, 04:09 AM #37
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Default Re: Buck Converter Feeler?

The fit is small. I suppose you could use through-holes, but they won't be as constant (i.e. they have more tolerance), they don't come in as obscure resistance values, and they will take up a lot of space. It's like a 0603 resistor spot there.
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Old 08-31-2011, 08:43 PM #38
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Default Re: Buck Converter Feeler?

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I know how that feels...

Luckily,lol, I sliced my thumb and had to get it stitched back together so I have extra time

Might pick up a 10 pack of them schottky diodes and some resistors/solder paste so I can just place everything in an oven and let it magically solder itself
Haha good idea. I hear ya, unfortunately this semester I'm already taking a week off for a convention, so I don't have the extra absent days to magically get sick

Hey Wolfman, for a 445 diode would you have to use 2x CR123 batteries or one 18650 with this driver? Thanks for helping me make my second 445 ridiculously cheap!
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Old 08-31-2011, 09:06 PM #39
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Default Re: Buck Converter Feeler?

You would have to use two of them - remember, this is still buck, and 445s generally require 4.5V+, so you would just turn that extra voltage into current. I think my current drain at 1.4A current to the diode was something like 1A or so, possibly lower (simulated on my PSU, haven't installed it in its host yet).

EDIT: And no problem!

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Old 08-31-2011, 10:00 PM #40
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Default Re: Buck Converter Feeler?

Ah ok that makes sense, thanks much for the help!
I already have a ~1.1W 445, but I have an extra diode handy, so I thought I would make a bigger better one for me, and give the old one to a friend.
I'm not sure if I could trust my friend with 1W of lasing power (especially since he won't get glasses), so I think ill sell it and get him a less dangerous greenie
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Old 09-01-2011, 01:43 AM #41
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Default Re: Buck Converter Feeler?

Sounds good! I have a laser actually running on the stock version of this driver, and it works fine, but only putting out a measly 600mW. Hopefully I'll be able to sell it once I upgrade to my new beast (output power of 1.2W).
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Old 09-02-2011, 07:36 AM #42
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Default Re: Buck Converter Feeler?

Bro, if you can't sell these, thanks for the idea of a cheap buck

Will probably buy a few along with some Schotchkys and resistors from fleabay

+1 if i can (cant now, wont forget though)

People might hate me for saying this but you should sell these for over 5 dollars.... lol
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Old 09-02-2011, 08:03 AM #43
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Default Re: Buck Converter Feeler?

Bought this set of 20 of those diodes from a china ebayer:
20 PCS SS34 DO-214AC 1N5822 SMD Schottky Barrier Diodes | eBay

They will probably take awhile to get here, but I wouldn't mind throwing a few in a envelope for a stamp if anyone needed some. Ill never need 20 of those o_0
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Old 09-02-2011, 01:46 PM #44
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Default Re: Buck Converter Feeler?

Yeah, I was thinking about charging more than $5 for them, but then doesn't that defeat the purpose of such a cheap buck driver? Anyway, it would essentially be reselling for profit here, and that's not why I am here. I just can't justify spending as much time as I would on orders (I would assume these would be very popular) for as little money as I would be making, especially during first semester of college.
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Old 09-17-2011, 02:00 AM #45
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Default Re: Buck Converter Feeler?

Wolfman, do you know what resistor would provide 1.5-1.8A of current in these drivers?
I would do the math myself, but I have no idea how to even start, as I have never done such a thing...
Ill admit I do not even know what SMD resistors look like. On this particular driver (I just got my diodes and drivers in the mail), I would assume they are the TINY little black things with 3 numbers on them indicating the type?

I can't believe it, but for some ridiculous reason I didn't read the parts of this thread that indicated that the resistors needed to be changed as well as the diode.
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Old 09-17-2011, 06:32 AM #46
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Default Re: Buck Converter Feeler?

Yeah... the resistors for 1.8A I believe worked out to be something like two .27 Ohm resistors in parallel, I think?

The 1.5As I think were the stock .27Ohm resistor that comes with it and add a parallel .44Ohm resistor.
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Old 09-17-2011, 07:59 AM #47
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Default Re: Buck Converter Feeler?

Awesome Wolfman, thanks for helping me out!
The good news is that you can get 5000 SMD resistors of 50 different values for $10 on ebay, guess ill be making alot of drivers
I found the 27 ohm resistor (#270) I believe, it's connected to the cathode lead and labeled R1.
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Old 09-17-2011, 08:35 AM #48
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Default Re: Buck Converter Feeler?

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Awesome Wolfman, thanks for helping me out!
The good news is that you can get 5000 SMD resistors of 50 different values for $10 on ebay, guess ill be making alot of drivers
I found the 27 ohm resistor (#270) I believe, it's connected to the cathode lead and labeled R1.
I found that deal a while ago but lost it now. would ya mind giving me the link?

thanks
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