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Old 11-06-2011, 09:23 PM #1
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Default Built my First 445nm Laser But.....

I have finished my laser and I am using 7 x 4ohm resistors in Parallel to bring 0.57 of an Ohm. This should work out to about 1.4Amps right? I am measuring from the Multi Meter and the mA being Inputed are only 800mA even though I have a resistance of 0.57. I have a pot to adjust the current, so I can change it when I want. Is this effecting the ohms? I am running about 7.4V from 2 18650 batteries in Series. I forgot to mention thatbits a DIT LM317 driver.


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I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



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Last edited by itsmei; 11-06-2011 at 09:42 PM.
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Old 11-06-2011, 10:29 PM #2
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Default Re: Built my First 445nm Laser But.....

The pot will affect the total resistance. It's just an adjustable resistor, and there will still be a minimum value there even when it's cranked all the way down. I'm assuming that it's hooked up in series with your other resistors? How did you figure 1.4 Amps?

Last edited by Ghostchrome; 11-06-2011 at 10:32 PM.
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Old 11-07-2011, 06:35 AM #3
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Default Re: Built my First 445nm Laser But.....

Quote:
Originally Posted by Ghostchrome View Post
The pot will affect the total resistance. It's just an adjustable resistor, and there will still be a minimum value there even when it's cranked all the way down. I'm assuming that it's hooked up in series with your other resistors? How did you figure 1.4 Amps?
Woops sorry my Maths went a bit wrong it should actually be 2.19A which I am inputing. As I am using the LM317 the reference voltage is 1.25V. The calculation is 1.25 / 0.57 = 2.19A. The weird thing is I am currently getting 800mA which is less than harf. I did origionally only have 4 x 4ohm resistors to give me 1 ohm but then I thought I would add more resistors in parallel to boost the current up. In the end it only went up about 20mA per resistor. I think I should remove the 3 resistors I added and remove the Pot and see what the Input in mA is. What do you think I should do?

Edit: do you think it is lack of volts?
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LPC 815 DIY 280mW 650nm Click me
2x DIY Red 5mW 650nm
Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



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Last edited by itsmei; 11-07-2011 at 06:42 AM.
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Old 11-07-2011, 02:25 PM #4
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Default Re: Built my First 445nm Laser But.....

Quote:
Originally Posted by itsmei View Post
Woops sorry my Maths went a bit wrong it should actually be 2.19A which I am inputing. As I am using the LM317 the reference voltage is 1.25V. The calculation is 1.25 / 0.57 = 2.19A. The weird thing is I am currently getting 800mA which is less than harf. I did origionally only have 4 x 4ohm resistors to give me 1 ohm but then I thought I would add more resistors in parallel to boost the current up. In the end it only went up about 20mA per resistor. I think I should remove the 3 resistors I added and remove the Pot and see what the Input in mA is. What do you think I should do?

Edit: do you think it is lack of volts?
The LM317 cannot supply 2 amps I bet it is broken or in protection mode while active. Also the resistor may have changed sue to excessive wattage.
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Old 11-07-2011, 04:17 PM #5
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Default Re: Built my First 445nm Laser But.....

Quote:
Originally Posted by midias View Post
The LM317 cannot supply 2 amps I bet it is broken or in protection mode while active. Also the resistor may have changed sue to excessive wattage.
I first had it set to 4x 4ohm resistors to give me 1ohm. This is about 1.25A but when i looked at the input current it was only 700mA.
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LPC 815 DIY 280mW 650nm Click me
2x DIY Red 5mW 650nm
Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



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Old 11-07-2011, 04:59 PM #6
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Default Re: Built my First 445nm Laser But.....

Quote:
Originally Posted by itsmei View Post
I first had it set to 4x 4ohm resistors to give me 1ohm. This is about 1.25A but when i looked at the input current it was only 700mA.
Did you use a heatsink? What was your input voltage?
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Old 11-07-2011, 05:02 PM #7
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Default Re: Built my First 445nm Laser But.....

I have a very big heatsink because it is a Lab Style Host. I have 2x 18650 batteries in Series to give 7.4V. I am using a potentiometer and a a few resistors to equal out at 1ohm. I have two suggestions why it is not working:
1. The pot still have resistance when it is all the way down.
2. I think this is most likely is that there is not enough Volts.
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I am currently new to lasers, i have:

LPC 815 DIY 280mW 650nm Click me
2x DIY Red 5mW 650nm
Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



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Old 11-07-2011, 09:33 PM #8
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Default Re: Built my First 445nm Laser But.....

EDIT: I have done a few tests and the problem is 7.4V is no way near enough. It is not stable, I am attaching a 12V power supply so I can have it either battery powered (portable) or plug a power supply via a port for continual use. I do have a nice heatsink on the lm317 so it won't get hot. At least I can push it to about 1.5A.
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I am currently new to lasers, i have:

LPC 815 DIY 280mW 650nm Click me
2x DIY Red 5mW 650nm
Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



Click me to Donate to me please Everything helps for me to save and review more lasers

Last edited by itsmei; 11-07-2011 at 09:34 PM.
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Old 11-13-2011, 06:50 AM #9
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Default Re: Built my First 445nm Laser But.....

Seems like an awful lot of waste voltage to dump.
2 lipos were always good enough for my lm317 builds (I only use lm350 now)
With 12V you have to dump all of that extra voltage as heat.
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