erdabyz
0
- Joined
- Jun 30, 2008
- Messages
- 286
- Points
- 0
Today I realized that this monday is a friend's birthday. She is a very curious girl that was amazed when I showed her my lasers because she asked me to do that(I only have a dilda and a 16X homemade burner). So I thought that a laser could be a great present...
Luckily I was just trying to build a small 635nm pointer, so I thought... this one will be for her.
I bought a small host from ledshoppe:
http://www.ledshoppe.com/Product/ledp/LP1064.htm
Too bad that it hasn't got a switch but....
I disassembled it and saw how easy is to attach an aixiz module inside.
This is the schematic:
As you can see, is as easy as screwing the head to the back of the module through the hole of the host. Threre's no space for a heatsink, but for low powered lasers I think it's fine.
The secnd surprise came when I analized the driver that came with the host. It turned out to be just a boost regulator from 1.5V to 3V. My laser diode had to run between 2.2 and 2.7v, at 40-50mA... so using ohm's law for 50mA at 2.4 V, I took a potentiometer adjusted it, connected in series with my test load, that also drops 2.4V, and... 52 stable milliamps!!!! I tested it for about 5 minutes and it ended droping to 48mA after that...
Even if this is not stable enought, I doubt that the laser diode will ever get more than 55mA or less than 40, which "should" be safe... so I used this driver so I can use this laser with just an AAA battery.
The next thing to do was cutting an aixiz back to use as a separator to hold the driver in place. That was the unic machining step I had to do, just using a metal handsaw!!!
I connected everything, soldered the diode and screwed the head without twisting the wires, as the driver was free to twist. Then I just pressed the driver into his original housing, added a bit of solder to its back to improve contact with the battery and host (ground) and as this host hasn't got a switch, I covered the threads of the battery compartment with teflon tape to ensure that it wouldn't make contact until completely screwed. IT LASED!!!
Here are the pictures:
Sorry, i haven't got pictures of how it looks inside. I don't want to disassemble it...
Now all I need is a focusing ring befre this monday... I'll see what can i do.
Luckily I was just trying to build a small 635nm pointer, so I thought... this one will be for her.
I bought a small host from ledshoppe:
http://www.ledshoppe.com/Product/ledp/LP1064.htm
Too bad that it hasn't got a switch but....
I disassembled it and saw how easy is to attach an aixiz module inside.
This is the schematic:
As you can see, is as easy as screwing the head to the back of the module through the hole of the host. Threre's no space for a heatsink, but for low powered lasers I think it's fine.
The secnd surprise came when I analized the driver that came with the host. It turned out to be just a boost regulator from 1.5V to 3V. My laser diode had to run between 2.2 and 2.7v, at 40-50mA... so using ohm's law for 50mA at 2.4 V, I took a potentiometer adjusted it, connected in series with my test load, that also drops 2.4V, and... 52 stable milliamps!!!! I tested it for about 5 minutes and it ended droping to 48mA after that...
Even if this is not stable enought, I doubt that the laser diode will ever get more than 55mA or less than 40, which "should" be safe... so I used this driver so I can use this laser with just an AAA battery.
The next thing to do was cutting an aixiz back to use as a separator to hold the driver in place. That was the unic machining step I had to do, just using a metal handsaw!!!
I connected everything, soldered the diode and screwed the head without twisting the wires, as the driver was free to twist. Then I just pressed the driver into his original housing, added a bit of solder to its back to improve contact with the battery and host (ground) and as this host hasn't got a switch, I covered the threads of the battery compartment with teflon tape to ensure that it wouldn't make contact until completely screwed. IT LASED!!!
Here are the pictures:
Sorry, i haven't got pictures of how it looks inside. I don't want to disassemble it...
Now all I need is a focusing ring befre this monday... I'll see what can i do.
