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- Apr 29, 2008
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Greetings,
I want to build a red laser using a single Li-Ion (4.2V) battery. A LM317-style driver would work great if the dropout voltage wasn't so high. I'd like for the current to be adjustable from 0-150mA. I'm using an Opnext 638nm diode which has a Vf of 2.6V at 150ma. So the dropout voltage needs to be around 1V.
So basically it has to fit the following criteria:
Just wondering what my options are. (And yes, I know the Flexdrive will work, but it's expensive and I don't feel like reverse engineering it!)
Peace,
Grant
Edit:
Well, after not building lasers for so long, I totally forgot that I have a whole bunch of Groove drivers in my workshop. Implementing the groove driver might be difficult for my application, so if you guys have any other ideas please let me know!
I want to build a red laser using a single Li-Ion (4.2V) battery. A LM317-style driver would work great if the dropout voltage wasn't so high. I'd like for the current to be adjustable from 0-150mA. I'm using an Opnext 638nm diode which has a Vf of 2.6V at 150ma. So the dropout voltage needs to be around 1V.
So basically it has to fit the following criteria:
- Low-droput driver (Linear or buck)
- 0-150mA
- Drops around 1V at 150mA
- Current adjustable with external pot
Just wondering what my options are. (And yes, I know the Flexdrive will work, but it's expensive and I don't feel like reverse engineering it!)
Peace,
Grant
Edit:
Well, after not building lasers for so long, I totally forgot that I have a whole bunch of Groove drivers in my workshop. Implementing the groove driver might be difficult for my application, so if you guys have any other ideas please let me know!
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