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Old 12-25-2010, 07:47 AM   #1
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Default problems with microboost

so I'm building my 445nm but I have problem with microboost. I soldered the 2 jumpers for highest range (540-1000mA), checked every connection with a magnifying lens and everything seemed ok but when I connected it on my testload and 18650, the current was first around 340mA and dropped to about 270mA after few seconds. now when I turn the pot, the current is changing from like 268 to 275mA
so what should I do now?

there's also one thing: when I measured the value of that component marked yellow, it showed like 1ohm...
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Last edited by 3zuli; 12-25-2010 at 07:55 AM.
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Old 12-25-2010, 07:52 AM   #2
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Default Re: problems with microboost

Whats your power supply and test load consist of
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Old 12-25-2010, 07:57 AM   #3
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Default Re: problems with microboost

psu is one 3.6V 18650
testload 6x 1N4007 in series and one 1ohm resistor
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Old 12-25-2010, 08:02 AM   #4
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Default Re: problems with microboost

That is roughly (.7)*6+A=Vf

Makes sense? There is not enough juice Try 3-5 diodes.
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Old 12-25-2010, 08:14 AM   #5
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Default Re: problems with microboost

ok gonna try it

edit: tried 4 diodes, now it's going from about 360mA to 410mA and when it hits 400mA it starts to whistle
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Last edited by 3zuli; 12-25-2010 at 08:21 AM.
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Old 12-25-2010, 08:16 AM   #6
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Default Re: problems with microboost

Yeah man, the less diodes, the higher the range should be.
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Old 12-25-2010, 09:08 AM   #7
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Default Re: problems with microboost

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DX 50mW in modded LAS-7 spirograph link

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Old 12-25-2010, 09:10 AM   #8
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Default Re: problems with microboost

Whistle? Nothing should be whistling. Lol Where is it coming from?
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Old 12-25-2010, 10:05 AM   #9
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Default Re: problems with microboost

from driver
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Old 12-25-2010, 10:08 AM   #10
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Default Re: problems with microboost

Well Yeah, Where on it?
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Old 12-25-2010, 10:11 AM   #11
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Default Re: problems with microboost

I dunno, I think it's comming from inductor...?
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Old 12-25-2010, 10:20 AM   #12
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Default Re: problems with microboost

I am trying to think why and component on a PCB would whistle. The only piece I ever had trouble with was on a cheap driver when a cap blew up. Can you take a picture, or video?
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Old 12-25-2010, 10:32 AM   #13
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Default Re: problems with microboost

I think nothing unusual can be seen on the driver... all solder connections are ok
but I still can't understand why it doesnt regulate in full range
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Old 12-25-2010, 01:18 PM   #14
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Default Re: problems with microboost

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DX 50mW in modded LAS-7 spirograph link

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Old 12-25-2010, 03:22 PM   #15
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Default Re: problems with microboost

Can you take you take a macro pic of your soldering job?
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Old 12-25-2010, 04:43 PM   #16
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Default Re: problems with microboost

here u r
(wires to LD are soldered temporary, because they go to test load. later I'll solder other wires, going to LD)
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LPC-815 "mini labby" @ 350mA

SLD63518262 5mW 635nm
DX 5mW
DX 50mW
DX 30mW module in spirograph link
DX 50mW in modded LAS-7 spirograph link

445nm 800mW link
PHR-803T @ 105mA in DildaV2 kit link

Last edited by 3zuli; 12-25-2010 at 04:50 PM.
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Old 12-25-2010, 06:44 PM   #17
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Default Re: problems with microboost

bump...
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DX 50mW in modded LAS-7 spirograph link

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Old 12-25-2010, 08:07 PM   #18
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Default Re: problems with microboost

Sorry man. I'm at a relatives for Christmas. I only have my phone. I will look at it in a few hours when I get home.
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Old 12-25-2010, 08:21 PM   #19
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Default Re: problems with microboost

Quote:
Originally Posted by 3zuli View Post
here u r
(wires to LD are soldered temporary, because they go to test load. later I'll solder other wires, going to LD)


Jumpers look right, but I can see that the board got really hot in that second picture. Not sure if that may have caused one of the components to lose it's connection or something...

The third picture shows your negative input connected also to the near by resistor (or component), but that trace is going to that solder point anyway, so I don't see that as an issue...

Which is why I'm guessing something maybe got fried. (overheated maybe)

But yes, use a '4 silicon diode' test load for these. Not a 6. (unless it is for a low setting. Like 400mA's or less)
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Old 12-25-2010, 08:28 PM   #20
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Default Re: problems with microboost

When doing something crazy like 1.5A heatsinked builds, only use 3
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Old 12-25-2010, 08:29 PM   #21
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Default Re: problems with microboost

It is hard to tell for sure but it looks like you may have bridged these connections. Circled in yellow.



EDIT looks like Jay beat me to it. EDIT



Also for a real clean look and solid connection I like to strip the wires only to the depth of the hole and add a little flux to the top of the wire only. Then stick them through the hole and put a little solder on the top for a second or two and it will draw it in for a nice clean solid connection. This is a flex but same idea.




Last edited by DTR; 12-25-2010 at 08:34 PM.
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Old 12-26-2010, 12:56 AM   #22
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Default Re: problems with microboost

Good pics. That's why I asked for them. I'm glad a couple of vets could chime in and offer their opinions.

As been said, the jumpers look correct except for your that your negative input is bridged to that resistor. But has Jayrob said, that resistor trace is going to that solder point anyway.

I would offer 2 pieces of advice:

1)PM your pics to the drlava himself and see what he says. I know he is busy and might not get back to you for a day or two but it's worth a shot. If anyone can tell you it would be him.

I thought I messed up the current jumpers on a flexdrive once (resistors fell off and everything) but I emailed drlava the pics and to my surprise he told me the important ones were still there and what to do to fix it so it was usable. Unfortunately I messed it up worse but thats not the point.

2) In your OP you said you were setting the microboost to the highest setting of 540mA to 1000mA. There is actually a higher setting than that, 560mA - 1200mA. It's up to you but you could set it there by connecting all three resistors.

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Old 12-26-2010, 01:01 AM   #23
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Default Re: problems with microboost

The inadvertently jumper-ed capacitors are fine. The last part of the microboost manual (Soldering Precautions) says so.

Those aren't resistors, by the way!
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Old 01-04-2011, 07:44 PM   #24
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Default Re: problems with microboost

try charging your battery I have heard some of the flex drives "whistle" when they cannot get the current required.
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Old 01-04-2011, 08:11 PM   #25
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Default Re: problems with microboost

There was one member that had a whistler, apparently it is still working for him.
Electrical components are usually pretty uniform in quality but there are always some discrepancies.
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