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Old 07-13-2010, 03:17 PM #97
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Default Re: Introducing two new miniature drivers for portable lasers

Can I please get a status on my order ? Almost been 2 weeks since I paid....


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Old 07-13-2010, 07:16 PM #98
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Default Re: Introducing two new miniature drivers for portable lasers

drlava, my boostdrive heats up considerably when set to the highest current setting. Which chip should I attach a heastink to?
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Old 07-13-2010, 07:30 PM #99
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Default Re: Introducing two new miniature drivers for portable lasers

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Originally Posted by laser_freak View Post
drlava, my boostdrive heats up considerably when set to the highest current setting. Which chip should I attach a heastink to?
Good question.... My plan is to attach it to the side without the pot on it, that way I can adjust it whenever (as the pot is still exposed). But I suppose that wouldn't make much sense if that was the cool side.
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Old 07-16-2010, 05:58 AM #100
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Default Re: Introducing two new miniature drivers for portable lasers

You can heatsink the small square black chip on top if you like. Another trick to reduce heat would be to turn the pot all the way down and solder two (try one at first) 1 ohm resistors in parallel with the large range resistor on the bottom. At that point, probably only the first quarter turn of the pot can be used, but you will have halved the heat from that resistor.
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Old 07-20-2010, 05:53 AM #101
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Default Re: Introducing two new miniature drivers for portable lasers

Hello doctor lava, a few weeks ago I purchased one of your groove 2 drivers, I must say I'm eased with it ablot!
I'm planning on building a 405nm laser with it, the diode comes from a PHRT unit and I just wanted to ask how much voltage I should be using for the diode? Will a 9v battery work fine, or is it too much since this diode works with 5v and your driver ou has a 1.2v drop out.... Also how much current should I supply the diode with? To get at least about 100mw of power.

Well thanks a lot for this amazing driver! It's a great one for smaller diodes.
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Old 07-24-2010, 01:23 PM #102
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Default Re: Introducing two new miniature drivers for portable lasers

A 9v battery will work but not for long, the capacity is very small.. i think it has something like 140mAh, which would drive a PHR for around an hour. you are better off going with two 3.7v 18650 li-ion batteries which would give you 7.4v & as they have a very big capacity (2400mAh) it will drive a PHR for around 20 hours. And last but not least, you should supply the PHR with ~110-120mA for 100mW of power.

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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 07-24-2010, 01:34 PM #103
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Default Re: Introducing two new miniature drivers for portable lasers

Great info here --TY to all-

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Old 07-25-2010, 03:14 PM #104
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Default Re: Introducing two new miniature drivers for portable lasers

Awesome thanks a lot Stuart!
By the way, what does it mean when you say that a battery yield 140mAh or 2400mAh? It means it can yield that much current if the lod requires it? or that with any load it yield 2400mAh?
Thanks a lot again, and I"m still waiting for my diode to get to Canada
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Old 07-25-2010, 04:18 PM #105
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Default Re: Introducing two new miniature drivers for portable lasers

2400/140mAh is the battery capacity, for example

a 9v battery has 140mAh, so if you say... want to run an led off of it and it only consumes 20mAh (milliamperes/hr) it will take 7 hours for the battery to drain completely. it will only drain as much per hour that the load requires. hope this helped.

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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 07-25-2010, 06:54 PM #106
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Exclamation Re: Introducing two new miniature drivers for portable lasers

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Originally Posted by drlava View Post
...Another trick to reduce heat would be to turn the pot all the way down and solder two (try one at first) 1 ohm resistors in parallel with the large range resistor on the bottom...
I am not sure I follow you, from what point to what point on the large resistor?

Quote:
Originally Posted by drlava View Post
...At that point, probably only the first quarter turn of the pot can be used, but you will have halved the heat from that resistor.
What would be the working mA range?

THANKS YOU VERY MUCH!!
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Old 07-25-2010, 11:28 PM #107
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Default Re: Introducing two new miniature drivers for portable lasers

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I am not sure I follow you, from what point to what point on the large resistor?
i think he means by that if there are more resistors, the heat can be dissipated more easily, thus making that component (and the driver) a little bit cooler... correct me if im wrong.

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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 07-25-2010, 11:46 PM #108
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Default Re: Introducing two new miniature drivers for portable lasers

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I am not sure I follow you, from what point to what point on the large resistor?



What would be the working mA range?

THANKS YOU VERY MUCH!!
More resistors = less power dissipated by each resistor = less heat.
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Old 07-26-2010, 03:04 AM #109
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Default Re: Introducing two new miniature drivers for portable lasers

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Originally Posted by laserboystuart View Post
2400/140mAh is the battery capacity, for example

a 9v battery has 140mAh, so if you say... want to run an led off of it and it only consumes 20mAh (milliamperes/hr) it will take 7 hours for the battery to drain completely. it will only drain as much per hour that the load requires. hope this helped.

stuart
Awesome!, makes perfect sense now, I shall buy some of those powerful Li-ion Batteries. Last question, it is a must to have some heatsinking for the laser diode right? otherwise the life of the laser might be shortened. Also if I add extra heat dissipation, am I able to raise the current to the diode a bit more?? or perhaps be able to run the laser for a few minutes?
Thanks a lot Stuart!
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Old 07-26-2010, 11:25 AM #110
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Default Re: Introducing two new miniature drivers for portable lasers

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Awesome!, makes perfect sense now, I shall buy some of those powerful Li-ion Batteries. Last question, it is a must to have some heatsinking for the laser diode right? otherwise the life of the laser might be shortened. Also if I add extra heat dissipation, am I able to raise the current to the diode a bit more?? or perhaps be able to run the laser for a few minutes?
Thanks a lot Stuart!
yes you do need a heatsink if you want your laser diode to survive, i recommend a copper heatsink. Also how long you have your laser diode running depends on the size, shape and material of the heatsink. but if you have a bigger heatsink, which will dissipate heat better, then you are able to raise the current (not majorly) more.

E.g i have the 18650 kit from jayrob with a microboost set at 900mA, i have a copper heatsink with the longer option, this means i can run my laser continuously for about 2 minutes without risking the diode, whereas if i had an aluminum heatsink, i would only be able to run the diode for about a minute. if i wanted to raise the current on my laser then i would have to shorten the duty cycle to compensate. get it now?

stuart
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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 07-27-2010, 10:00 PM #111
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Default Re: Introducing two new miniature drivers for portable lasers

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yes you do need a heatsink if you want your laser diode to survive, i recommend a copper heatsink. Also how long you have your laser diode running depends on the size, shape and material of the heatsink. but if you have a bigger heatsink, which will dissipate heat better, then you are able to raise the current (not majorly) more.

E.g i have the 18650 kit from jayrob with a microboost set at 900mA, i have a copper heatsink with the longer option, this means i can run my laser continuously for about 2 minutes without risking the diode, whereas if i had an aluminum heatsink, i would only be able to run the diode for about a minute. if i wanted to raise the current on my laser then i would have to shorten the duty cycle to compensate. get it now?

stuart
yes! I get it now I will post some pictures of how my build is going to be, but I'll do so as soon as I get off summer
school (going ahead sucks!). I have an aluminum heat sink, but it's quite big, and mine isn't a handheld laser, more like a portable laser because of the huge heat sink :P btw I'm thinking of taking the driver out of the laser module and attach it to the heat sink, for better heat dissipation, but I'm scared it might make contact with the metal part of te heat sink and make a short circuit.... Perhaps I can use the white paste that conducts heat???

Thanks again!!!
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Old 07-27-2010, 10:25 PM #112
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Default Re: Introducing two new miniature drivers for portable lasers

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yes! I get it now I will post some pictures of how my build is going to be, but I'll do so as soon as I get off summer
school (going ahead sucks!). I have an aluminum heat sink, but it's quite big, and mine isn't a handheld laser, more like a portable laser because of the huge heat sink :P btw I'm thinking of taking the driver out of the laser module and attach it to the heat sink, for better heat dissipation, but I'm scared it might make contact with the metal part of te heat sink and make a short circuit.... Perhaps I can use the white paste that conducts heat???

Thanks again!!!
Federico
no probem, glad to help

you can use not conductive thermal paste to attach the heatsink to the driver, and it wont make a short circuit with anything.

stuart
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Quote:
Originally Posted by AAlasers View Post
Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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