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30mw true green dx laser @ 4.5 volts

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thejunkmonger

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took the plunge and decided to try my my dx true green at 4.5 volts all I can say is WOW. I had a problem that it would not produce a good output if I didn't heat it up to 27 degrees C. at 4.5 volts it has super power instantly. Do you think I'll burn out the laser if i run it always at that voltage?
 





Razako

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Overloading the diodes is always a gamble. It will usually burn out in 2 seconds to an hour if you are unlucky. If you are lucky it could last for a couple of months or more depending on how you use it.
 
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thejunkmonger

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bcroft said:
how did you run it at 4.5?  what did you use?
Click to expand...
3 AAA's and a piece of wire I think if it could be a reliable solution I will make an adapter tube to hold 3 AAA's
I find it really annoying that i need to heat up the pointer to 27 degrees just to get more light output than a <5mw red
 
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thejunkmonger

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Razako said:
Overloading the diodes is always a gamble.  It will usually burn out in 2 seconds to an hour if you are unlucky.  If you are lucky it could last for a couple of months or more depending on how you use it.
Click to expand...


OverLoading I guess my experiment shows the circuitry inside does nothing because if it did i would think i would not have seen an increase in power.
 
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wooooooolazer

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Well if you have the same voltage but different currents it would bring it down to what its meant for, since its meant for 3v and you put 4.5 its going to give out more current.

...lazer.... ;D ;D ;D
 
Benm

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You could obviously damage it by running from too high voltages, but perhaps it's not that big a risk.

The problem with DX lasers is bad regulation of diode current by the electronics inside. Once you drive the pump diode directly, they become a lot more stable really. You still have the thermal issues where they either only work well from a certain temperature, or start to dim after a while because they run too warm.

For the price of these lasers, i'd say: risk it. I've also seen some reports here of people running them succesfully from a single (AAA sized) lithium battery, which would feed it 3.6 volts or so. Seems to have little ill effect.
 
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thejunkmonger

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Benm said:
You could obviously damage it by running from too high voltages, but perhaps it's not that big a risk.

The problem with DX lasers is bad regulation of diode current by the electronics inside. Once you drive the pump diode directly, they become a lot more stable really. You still have the thermal issues where they either only work well from a certain temperature, or start to dim after a while because they run too warm.

For the price of these lasers, i'd say: risk it. I've also seen some reports here of people running them succesfully from a single (AAA sized) lithium battery, which would feed it 3.6 volts or so. Seems to have little ill effect.
Click to expand...

Thanks for the info as soon as i get the battery barrel sorted out i will try to run it always on 4.5 volts, unfortunately I dropped mine and bent the threads, this was in the process of deciding on how to make it longer to accept another battery. anyway someone on the list offered me one that should work, I'll see how it goes.
 
f22warzone

f22warzone

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why not just make the dimater bigger and go with one bit 18650 cell that puts out 3.6v -4.2v you would be set then ..... long run time safe power level and compact : )
 
Benm

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I dont remember from whom, but there is a picture on here somewhere with a DX20 (or 30) running on one 10440 lithium cell, made to fit by cutting off part of the battery tube. Could be an option too, but battery life will be limited.
 
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Ref

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Benm said:
I dont remember from whom, but there is a picture on here somewhere with a DX20 (or 30) running on one 10440 lithium cell, made to fit by cutting off part of the battery tube. Could be an option too, but battery life will be limited.
Click to expand...

I dont have a 10440 in my posession (nor have I ever, so I dont really know the dimensions compaired to a AAA), but wouldnt you be able to do the same thing by placing a spacer or some type of spring in the bottom of the tube?
 
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toked323

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it wont kill it because there a regulator/driver but it will shorten it life but not by much
 
Benm

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10440 is indeed AAA size. You can just use one of those and a dummy to keep the laser intact.
 
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wooooooolazer

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The good thing about cutting it though is that you get an almost key chain sized laser.

...lazer... ;D ;D ;D
 
Ref

Ref

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How would you go about doing that? Do the threads at the bottom of the batt tube separate with force?
 
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