Need Advice

[SunixDev]

Hello

I just found on ebay 2 laser of 100mw++ red laser
the laser are looking like this

First


Second


They are arround at same price (15usd~), do you think those laser have driver
include ?They have a small heatsink but ..., on the spec the working voltage is 3.2
to 5.5v, will it be safe to use them with a 18650 battery ?

Thanks
Regard
sorry for my english ...​

 

[Rivem]

There's almost definitely a driver inside the module. If the specs are true, you could use ONE 18650 or other Lithium cell (3.7/4.2 volts).

 

[SunixDev]

There's almost definitely a driver inside the module. If the specs are true, you could use ONE 18650 or other Lithium cell (3.7/4.2 volts).

Ok thank you very much :bowdown:, for the price if the driver is inclue then ill buy one

The Current: <300mA is it still safe for the 18650 bttery

 

[Rivem]

Ok thank you very much :bowdown:, for the price if the driver is inclue then ill buy one

The Current: <300mA is it still safe for the 18650 bttery

Current is safe. The driver controls that part of it, and it'd have to be very big to hurt the battery.

 

[SunixDev]

Current is safe. The driver controls that part of it, and it'd have to be very big to hurt the battery.

Ok thank you , battery is not the matter i wouldnt burn the laser diode itself xD

i have a question , i found a 300mw laser diode really cheap and i would like to put it in a cheap laser pen with driver like 5mw for example is it safe to do or i should not do that ?

 

[Rivem]

Ok thank you , battery is not the matter i wouldnt burn the laser diode itself xD

i have a question , i found a 300mw laser diode really cheap and i would like to put it in a cheap laser pen with driver like 5mw for example is it safe to do or i should not do that ?

You can drive some diodes very low compared to their rating, and it's not dangerous. I wouldn't expect a 300mW diode to work at a 5mW power level though.

 

[SunixDev]

You can drive some diodes very low compared to their rating, and it's not dangerous. I wouldn't expect a 300mW diode to work at a 5mW power level though.

Ok thank you i will try to make a lm317 driver then