Leadlight 105 Modification Stage3

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Re: Leadlight Resistor Modification - Stage 3

No, it's just the oposite. The smaller the resistor the lower the power rating. ie. a 1/4w is smaller than a 1/2w

Jack
 
Re: Leadlight Resistor Modification - Stage 3

right. /ubbthreads/images/graemlins/ohgeez.gif
I need a good 5 hours of sleep... oh! coffee /ubbthreads/images/graemlins/duh2.gif
 
Re: Leadlight Resistor Modification - Stage 3

What if the pot and both controlling resistors were removed, the contacts for the original smr's were bridged with solder and the you put the 220ohm resistor where the pot used to be? When i was doing the pot mod for the first time i think i pressed down too hard or something and now the pot turns a little too freely. This in turn causes current draw fluctuations so im just looking for a way to keep it a bit more stable.
 
Re: Leadlight Resistor Modification - Stage 3

A weird thing about mine is after the resistor mod and after a problem I took off my 220ohm res. and there was no difference in output -20mw the same as with resistor on. And it still drew 400ma of current just like when it was on, so then I bridged the gap with solder and Its still the same 400ma current 20mw. But before my "problem" I was pushing out 65mw at 440ma, my "problem" Is a whole nother thread
 
Re: Leadlight Resistor Modification - Stage 3

Are there any pictures of a modded one?
 
Re: Leadlight Resistor Modification - Stage 3

pictures of the driver chip modded or pictures of the modded beam? I have pics of mine modded but they are the old school big resistors with the long leads on each end.
 
Re: Leadlight Resistor Modification - Stage 3

Pics of the modded chip please. beam would be nice too, but I wanted to see the chip
 
Re: Leadlight Resistor Modification - Stage 3

Did you mean this ?
resmod1.jpg
 
Re: Leadlight Resistor Modification - Stage 3

exactly, Thanks
 
Re: Leadlight Resistor Modification - Stage 3

Here's a couple here of one of my modded 105's:

stage3_front.jpg


stage3_back.jpg


/ubbthreads/images/graemlins/grin.gif
 
Re: Leadlight Resistor Modification - Stage 3

Nice, clean soldering job there /ubbthreads/images/graemlins/smile.gif
 
Re: Leadlight Resistor Modification - Stage 3

Thats what the ' /ubbthreads/images/graemlins/grin.gif ' was for. /ubbthreads/images/graemlins/grinser2.gif
 
Re: Leadlight Resistor Modification - Stage 3

Im still trying to decide if I want t do this mod or not...
 
Re: Leadlight Resistor Modification - Stage 3

if you cant solder tiny parts good find someone who can, and make sure you use a very low power soldering iron-like 25w, and make sure to tin your tip and use something to hold chip securely while doing it.
 
Re: Leadlight Resistor Modification - Stage 3

DO IT !!!! /ubbthreads/images/graemlins/happy14.gif
 
Re: Leadlight Resistor Modification - Stage 3

Is there a strong benift to putting that 3.3kohm resistor in? I did this mod awhile ago and used a 100ohm resistor instead of 220, it seems to be working fine though
 
Re: Leadlight Resistor Modification - Stage 3

Actually the 3.3k is just as importanat as the 220.

It allows the circuit to run more stable and with less overdriving of the board components. It's not just the diode that can have probs with the new higher current.

Just replacing the pot resistor alone though doesn't give the max current of 550ma because of the layout and extra heat generated by the circuit - resistance rises and the power drops as the components warm-up. /ubbthreads/images/graemlins/jpshakehead.gif
 
Re: Leadlight Resistor Modification - Stage 3

Cant wait until you re-write all of these mod writeups into one clear and concise page. /ubbthreads/images/graemlins/smile.gif
 
Re: Leadlight Resistor Modification - Stage 3

Hi
Thanks LaserMod for you helping in French.
So I put a 3.3Kohm and remplaced 220ohm by 0ohm and no problem findings.

Firefly
 
Re: Leadlight Resistor Modification - Stage 3

"Voulez-vous dire court-circuiter les contacts?"
You mean just shorting the contacts?

"Vous risquerez la diode avec cette quantité de puissance."
You will be risking the diode with that amount of power.

/ubbthreads/images/graemlins/grinser2.gif
 
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