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Old 08-03-2010, 07:03 PM #1
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Default Pot modding lab laser

I want to pot mod the green module in my RGB projector to decrease power, because the color balance is terrible. But there is two small problems..

1. There is two pots on the driver, how do I know which controls the current? Written next to the pots are VR1 and VR2.
2. The screws on the pots are glued in place . How can I remove this glue without damaging the pots?

Pot modding lab laser-sany0007.jpg


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Old 08-03-2010, 07:14 PM #2
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Default Re: Pot modding lab laser

hobby knife and carefully work around it.
you can also try to use a heated one to.
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Old 08-03-2010, 07:30 PM #3
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Default Re: Pot modding lab laser

The only easy way to tell which pot is which is to turn them just a little. If you see an immediate change in power, that's your diode pot. If the power doesn't seem to change at all, or if it does change but very slowly, that's your TEC pot. Just turning the pots will break the glue, it's not very strong.
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Old 08-03-2010, 08:09 PM #4
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Default Re: Pot modding lab laser

How far is just a little? I tried turning both 1,5 way around and saw no real difference
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Old 08-03-2010, 08:13 PM #5
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Default Re: Pot modding lab laser

Well, they are multi-turn pots so it might take a few turns to see much of a change. Basically whichever pot makes the biggest change in the least number of turns is the diode pot. An LPM of some sort is pretty important for this task.
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Old 08-03-2010, 08:46 PM #6
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Default Re: Pot modding lab laser

What the hell.. they both have immediate and strong effect on the power, except that one decreases power when turned clockwise, and one boosts power when turned clockwise..

EDIT: nvm I think I found the right one

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Old 08-03-2010, 08:58 PM #7
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Default Re: Pot modding lab laser

hmm, that's a bit odd.I haven't worked on one of these modules specifically, but I've worked on many that are like them. If I had to say, I'd say that whichever turns the power up when turning clockwise is likely your diode pot, but I'm not 100% on that given your experience so far.
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Old 08-03-2010, 09:22 PM #8
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Default Re: Pot modding lab laser

Yes I think that one was the diode pot after all, but the TEC pot still had a big effect on the output power, I wasn't expecting that.
Thanks for the help (again and again)
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Old 08-04-2010, 10:11 AM #9
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Question Re: Pot modding lab laser

There was any modulation input, on your labby ?

If so, one of the pot can also be threshold (or gain) of the mod input .....

Are you sure that there are only 2 trimmers ? ..... nothing other, in any part ?
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Old 08-04-2010, 10:45 AM #10
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Default Re: Pot modding lab laser

correct me if i am wrong but couldnt you just place resisters on the output?
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Old 08-04-2010, 02:24 PM #11
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Default Re: Pot modding lab laser

Quote:
Originally Posted by HIMNL9 View Post
There was any modulation input, on your labby ?

If so, one of the pot can also be threshold (or gain) of the mod input .....

Are you sure that there are only 2 trimmers ? ..... nothing other, in any part ?

There is a modulation input, but being such a simple TTL driver I'd imagine that there is no threshold adjustment. But as I said, I could be wrong.. I haven't ever worked on those drivers specifically.
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