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Old 05-07-2013, 05:18 PM #1
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Default Resolved: Plea for help from the driver builders

Hi all. I've got a problem with a Mohgasm linear assembly I am attempting.

I am trying to set one @ ~300mA. I've done the math: 1.25/R=I(amps) and have come up w/ a resistance value of 4.2 Ohms.

I've assembled a couple of these now. Matt was so very kind to give me the makings for a few of them. So, I'm not unfamiliar with assembling them.

My problem is that despite all of my attempts, including throwing on just a 1Ohm resistor, and swapping ICs, and I cannot force out more than 170mA w/ 8V from the batteries.

Any ideas what I am doing wrong? Could I have damaged the IC with excesive heat when soldering it on? Could caps being placed improperly cause this kind of anomaly?

Thank you in advance for your help.


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405nm S06J, 675mW Krtyton Groove-Polished
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450nm Osram PL450B, 130mW, Kryton Groove-Polished
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Old 05-07-2013, 11:21 PM #2
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Default Re: Plea for help from the driver builders

Take some pictures so we can see if there is anything wrong.
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Old 05-08-2013, 01:08 AM #3
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Default Re: Plea for help from the driver builders

Thanks, BB. No need now. I worked it out. I had a hair-thin solder bridge to the switch leg. All better now, and running smoothly at 305mA with new resistor setting.
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405nm S06J, 675mW Krtyton Groove-Polished
The Bastard:445nm, 2W M-140 UF KF-T60
445nm, 9mm, 3.2W Kryton Groove-Polished
450nm Osram PL450B, 130mW, Kryton Groove-Polished
La Spada Verdi: 1st Ever PL520 MS-SSW 115mW
532nm, 100mW, Taped to Sanyo 18650/3100mAh
638nm Opnext, 160mW, Kryton Groove-Polished
650nm LPC-826, 360mW, MXDL Host Kit by Mrcrouse
650nm <5mW Laser Pointer/UV LED/LED flashlight NEBO 5063


5W Ophir 20C-A-1Y LPM
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