Fiddy
0
- Joined
- May 22, 2011
- Messages
- 2,726
- Points
- 63
G'day,
So yesterday i received a special host with heatsink off rhd.
It runs off 2x AA nicad batteries or 1 single 14500 lithium and the host detail and machining work is nice.
The thing i was most interested in was the driver and control on this bad boy.
It has a ring near the end of the host that was controlling current depending on how far you turned it!
So once i knew this i wondered if i could use it to control a laser.
I did a few calculations on the XPG LED inside and worked out a current based on its claimed maximum light output.
My semi-educated estimate was ~528mA.
I looked for a laser diode that had a similar Vf current to that of a XPG LED, and that was case isolated, because i was unsure if the driver's negative was continuous.
So the 300mW ML520G71 was perfect for this application.
I stripped down the host, removed the LED and driver and put some of that nice 26 gauge wire on the driver.
Now the ring that is used to vary the output current has no electrical connection to the driver or diode!
So i put it all back together and put it on the test load, it made 510mA with 3 rectifier diodes in series giving a 2.1Vdrop.
Happy with the results i quickly tested it (while the module wasn't installed into the housing to make it case isolated)
with a LPC-826 i had on hand in a module, it worked really well!
Today i installed a the ML520G71 into the host today and it ran flawlessly!
You get a large range of power outputs with this setup
Here's a video:
Note: the heatsink that im using doesn't have a set screw so i cant mount it up properly at the moment.
I will get LPM and beamshots when i fully assemble the laser this weekend.
Thanks for looking!
Fiddy.
So yesterday i received a special host with heatsink off rhd.
It runs off 2x AA nicad batteries or 1 single 14500 lithium and the host detail and machining work is nice.
The thing i was most interested in was the driver and control on this bad boy.
It has a ring near the end of the host that was controlling current depending on how far you turned it!
So once i knew this i wondered if i could use it to control a laser.
I did a few calculations on the XPG LED inside and worked out a current based on its claimed maximum light output.
My semi-educated estimate was ~528mA.
I looked for a laser diode that had a similar Vf current to that of a XPG LED, and that was case isolated, because i was unsure if the driver's negative was continuous.
So the 300mW ML520G71 was perfect for this application.
I stripped down the host, removed the LED and driver and put some of that nice 26 gauge wire on the driver.
Now the ring that is used to vary the output current has no electrical connection to the driver or diode!
So i put it all back together and put it on the test load, it made 510mA with 3 rectifier diodes in series giving a 2.1Vdrop.
Happy with the results i quickly tested it (while the module wasn't installed into the housing to make it case isolated)
with a LPC-826 i had on hand in a module, it worked really well!
Today i installed a the ML520G71 into the host today and it ran flawlessly!
You get a large range of power outputs with this setup
Here's a video:
Note: the heatsink that im using doesn't have a set screw so i cant mount it up properly at the moment.
I will get LPM and beamshots when i fully assemble the laser this weekend.
Thanks for looking!
Fiddy.
Last edited:
! Excellent work:beer:!!
