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How to safely power DVD laser?
Hey guys!
I just wanted to know how to safely power a DVD red laser diode using 2x AAA rechargeable cells rated at 600mAh each.
I have seen some people use just a 1K resistor and the diode, but is this safe?
Thanks in advance,
IndianHacker.
Comments
5 years ago
I would use a LM78L05 or 78L05 in a current regulating configuration.
Like this circuit.
https://www.instructables.com/id/Circuit-Testing/
If you have smd components to work with the 78L05 it can be very discrete.
Answer 5 years ago
That's helpful!
Thanks a lot!
Answer 5 years ago
If you want more than basic power supply the laser check Ebay for Laser diode drivers.
They come really cheap and small and the better ones offer a TTL logic input that can be used to turn the laser on and off, which makes it really nice for other experiments too - plus you don't force a lot of current through a tiny switch ;)
Answer 5 years ago
Actually I want to make one...
Answer 5 years ago
Not on 3V supply you won't....
5 years ago
There is a reason why someone invented constant current drivers for laser diodes.
If you want to play with dangerous light, go blind or worse, then you should at least know what you are doing - this part I can not see in your posting anywhere.
Answer 5 years ago
Well, I do have lots of experience with diode lasers.
My question is, can the constant current driver be run from 3 volts from batteries?
Because the ideal voltage for the LM317 is 7 volts.
Answer 5 years ago
You need a boost converting constant current source, not an LM317. Lasers are very fussy about voltage spikes, so you need to be extremely careful there are no nasty transients on the output.
Answer 5 years ago
Oh Okay...
5 years ago
you say DVD but it has to be a DVD-RW if I remember correctly a regular reader uses IR lasers not red lasers
Answer 5 years ago
Yes it is a DVD RW.
5 years ago
Its probably safe, but its not optimal. You may find the laser isn't pushed over its threshold voltage properly, and isn't as powerful as it should be.