38mA out of 2 AAAs?

MadEye · 01-02-2012, 04:06 PM

Hi Guys, I cant find any solution for my problem, so I just try to ask you

I got a weak 10mW red diode and want to put it into a Pen Host I got here. The datasheet says at 10mW the Diode drains about 32-38mA at 2,2-2,5V. Im going to power it with 2 AAAs, so I got a Voltage of 3V... First I wanted to use a flex drive (May be a waste for a 10mW Laser, but I have one here and I dont need it atm... Also I just wanted to build an "less dangerous" laser then my other Lasers

)

But then I noticed the Flex Drive starts at 65mA! So I search for any Idea what I could use to power my diode. I would even somehow modificate my Flex Drive, or build some myself, but the Problem here is it must fit my Pen housing, so it should have about the size of the FlexDrive...

Now its up to you! Any Idea how I can power this diode without a resistor (I really dont want to use a Resistor for a weak diode like this, actually I would never power a Diode without a Driver...)

lazeerer · 01-02-2012, 04:58 PM

Power Supply Driver for 5mW 650nm/660nm Red Laser Diode LD | eBay

^^^Here.

Adj from 20mA to 40mA.

Supply voltage up to 3v or in your case 2x AAA 1.5v cells.

I bought 1 a wail ago and i can tell you it does what it says it does.

Hope that helps.

What diode is it you are trying to power.??? DO you have a link to where you got it.?

There are also other driver that will work of 2x AAA 1.5v cells at 40mA Just fine.

Like:
3V Laser Diode Driver for 532nm Green 650mA & 200mA-240mA 650nm 660nm Red | eBay

2pcs adjustable current laser diode driver 80-500mA w/TTL | eBay

Those can work too depending on the diode.!!!!

Pay no attention to the tittles on them that say they cant go bellow a certain currant. Both those drivers can go down to Zero no Problem.

MadEye · 01-02-2012, 08:16 PM

Hi, thank you for the Links!

Im using this Diode: http://www.uocnet.com/pdf/LD/U-LD-65...reliminary.pdf

Looks like I will buy the first one. Also the seller has some interesting filters in his shop

So thanks again!

-MadEye

Fiddy · 01-03-2012, 02:42 AM

looking at that data sheet, there is 2 pin out diagrams, A & C.

"C" is case negative & "A" is case positive, hope you choose "C" if you want to use the most common drivers!

Fiddy.

justinjja · 01-03-2012, 07:02 AM

you could just use a 25ohm resistor in series with your diode and batteries.

Your laser would just get dimmer as the batteries got low.

lazeerer · 01-03-2012, 09:04 AM

Quote:

Originally Posted by justinjja

you could just use a 25ohm resistor in series with your diode and batteries.

Your laser would just get dimmer as the batteries got low.

Please read the OP again. He clearly stted he does not want to use a resistor or direct drive this laser diode.

justinjja · 01-03-2012, 03:54 PM

Quote:

Originally Posted by lazeerer

Please read the OP again. He clearly stted he does not want to use a resistor or direct drive this laser diode.

I figured I would throw it out there, as ordering stuff from china on ebay seems to take like a month before it gets delivered,
Personaly, I can never wait that long

lazeerer · 01-03-2012, 04:21 PM

Quote:

Originally Posted by justinjja

I figured I would throw it out there, as ordering stuff from china on ebay seems to take like a month before it gets delivered,
Personaly, I can never wait that long

Tell me about.

Ive waited so much for so many different things that iam use to it now and doesn't bother me. But at first i use to go nuts.!

Benm · 01-07-2012, 01:25 AM

This is very tricky since the voltage leaves zero to little room to work with. You could try a single FET current source to work with - perhaps running two or three of those in paralel. The other choice would be to boost the voltage first and do the regulation afterwards, making the build much more complex.

01-02-2012, 04:06 PM	#1
MadEye Class 1M Laser Join Date: Aug 2011 Posts: 128 Rep Power: 22	38mA out of 2 AAAs? Hi Guys, I cant find any solution for my problem, so I just try to ask you I got a weak 10mW red diode and want to put it into a Pen Host I got here. The datasheet says at 10mW the Diode drains about 32-38mA at 2,2-2,5V. Im going to power it with 2 AAAs, so I got a Voltage of 3V... First I wanted to use a flex drive (May be a waste for a 10mW Laser, but I have one here and I dont need it atm... Also I just wanted to build an "less dangerous" laser then my other Lasers ) But then I noticed the Flex Drive starts at 65mA! So I search for any Idea what I could use to power my diode. I would even somehow modificate my Flex Drive, or build some myself, but the Problem here is it must fit my Pen housing, so it should have about the size of the FlexDrive... Now its up to you! Any Idea how I can power this diode without a resistor (I really dont want to use a Resistor for a weak diode like this, actually I would never power a Diode without a Driver...) __________________ 405nm: 100mW 405nm: 400mW C6 S06J 445nm: 1W C6 445nm: 1W DIY Labby LINK 532nm: 30mW 532nm: 400mW 655nm: 5mW DIY Pen 660nm: 250mW 3.2W LaserBee II

01-02-2012, 04:58 PM	#2
lazeerer Class 3B Laser Join Date: May 2010 Location: CT Posts: 3,493 Rep Power: 357	Re: 38mA out of 2 AAAs? Power Supply Driver for 5mW 650nm/660nm Red Laser Diode LD \| eBay ^^^Here. Adj from 20mA to 40mA. Supply voltage up to 3v or in your case 2x AAA 1.5v cells. I bought 1 a wail ago and i can tell you it does what it says it does. Hope that helps. What diode is it you are trying to power.??? DO you have a link to where you got it.? There are also other driver that will work of 2x AAA 1.5v cells at 40mA Just fine. Like: 3V Laser Diode Driver for 532nm Green 650mA & 200mA-240mA 650nm 660nm Red \| eBay 2pcs adjustable current laser diode driver 80-500mA w/TTL \| eBay Those can work too depending on the diode.!!!! Pay no attention to the tittles on them that say they cant go bellow a certain currant. Both those drivers can go down to Zero no Problem. __________________ 405nm 1013mW In Cree Z5 , 850mW LaserGLow Electra Mod , 583mW C3 BDR 445nm 3.6W Monster Freak TEC 9mm, 3.1W Fat Boy Build , 2.9W Big Stainless , 2.7W Big Black, 2W Arctic G2 , 1.8W C13 473nm 178mW CNI-PGL-III-C , 56mW CNI-PGL-III-C 488nm 21mW DPSS SAPPHIRE 515nm 83mW Direct Green Diode Fully Custom Host 532nm 617mW RPL Style , 213mW CNI-PGL-III-A , 120mW DIY SS C3 589nm 130mW CNI-PGL-III-A 594nm 13mW CNI-PGL-III-C 632nm 4mW HeNe 635nm 1130mW Fenix TK35 ML501P73 , 918mW Small Sun ZY ML520G71 , Sanyo 51mW Cree RL-118 650nm 1056mW Polished CNI-PGL-C Mod 658nm 430mW LOC 826 Brinyte A20 , LCC 390mW C3 3 mode 671nm 800mW PowerModulem 9mW Black Pen 685nm 44mW MXDL 2x AAA Pen, 41mW, 130mW Stainless Shadow 780nm 127mW Pen 808nm 758mW Fire Dragon From DJNY LPM's 2W/5W Ophir All My Reviews, Tips & Mods Are Here Now: >Reviews< Check Out My YouTube Video's Here: http://www.youtube.com/user/Lazereer Last edited by lazeerer; 01-02-2012 at 05:01 PM.

01-02-2012, 08:16 PM	#3
MadEye Class 1M Laser Join Date: Aug 2011 Posts: 128 Rep Power: 22	Re: 38mA out of 2 AAAs? Hi, thank you for the Links! Im using this Diode: http://www.uocnet.com/pdf/LD/U-LD-65...reliminary.pdf Looks like I will buy the first one. Also the seller has some interesting filters in his shop So thanks again! -MadEye __________________ 405nm: 100mW 405nm: 400mW C6 S06J 445nm: 1W C6 445nm: 1W DIY Labby LINK 532nm: 30mW 532nm: 400mW 655nm: 5mW DIY Pen 660nm: 250mW 3.2W LaserBee II

01-03-2012, 02:42 AM	#4
Fiddy Class 3R Laser Join Date: May 2011 Location: Down Under Posts: 2,354 Rep Power: 208	Re: 38mA out of 2 AAAs? looking at that data sheet, there is 2 pin out diagrams, A & C. "C" is case negative & "A" is case positive, hope you choose "C" if you want to use the most common drivers! Fiddy. __________________ 405nm - 1,910mW (6) 445nm - 15,895mW (15) 450nm - 370mW (2) 473nm - 110mW (2) 532nm - 1250mW (6) 632.8nm - 2mW (1) 637nm - 5105mW (8) 660nm - 1,850mW (5) 670nm - 600mW (1) 685nm - 40mW (1) 808nm - 2,700mW (3) RGB - 400mW (1) In Progress: 405nm - 500mW+ Kryton Groove 445nm - 2,000mW+ C-88 520nm - 50mW Ultrafire RL-118 SS 632.8nm - 0.5mW Mini HeNe Safety Glasses 2x Eagle Pair OD4+ 190nm-540nm 2x Eagle Pair OD4+ 90-400nm & 580-760nm OEM Lasers OD 5+ 190-435nm & 730-1085nm LaserBee 5W Laser Power Meter >Fiddy's Review/Tutorial/Build Compilation Thread< >>FS: Custom Glow Rings<< >>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<< CajunLasers FTW!

01-03-2012, 07:02 AM	#5
justinjja Class 2M Laser Join Date: Mar 2011 Location: Texas Posts: 668 Rep Power: 48	Re: 38mA out of 2 AAAs? you could just use a 25ohm resistor in series with your diode and batteries. Your laser would just get dimmer as the batteries got low. __________________ "V=I•R It's not a suggestion it's the law" -georg simon ohm

01-07-2012, 01:25 AM	#9
Benm Class 4 Laser Join Date: Aug 2007 Location: Netherlands Posts: 5,307 Rep Power: 188	Re: 38mA out of 2 AAAs? This is very tricky since the voltage leaves zero to little room to work with. You could try a single FET current source to work with - perhaps running two or three of those in paralel. The other choice would be to boost the voltage first and do the regulation afterwards, making the build much more complex. __________________ Ask a Scientist <- Soon! Ben's Electronics Projects ScienceFlicks Science Videos <- Have a look

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