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Driver for 2xAA batteries suply

fricek12

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How to build driver for laser diode with using only 2 AA batteries suply (as in most common laser pointers) which gives me only 2.4 V (NiMH) or 3V (alcaline batteries) DC ?

LM317 works only with >3 V

my 650nm laser diode needs 2.1-2.5V and 18-25mA.



Thank You
 

divindavid

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You're either going to need a boost driver or replace your AA batteries with 14500 lithium ion cells. 14500 cells are the same size as a AA battery and are 3.6 volts so combined you will have 7.2 volts which is plenty for a LM317 driver powering a red diode.
 

fricek12

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You're either going to need a boost driver or replace your AA batteries with 14500 lithium ion cells. 14500 cells are the same size as a AA battery and are 3.6 volts so combined you will have 7.2 volts which is plenty for a LM317 driver powering a red diode.

anyone knows simple circuit for boost driver? I d like to use 2.4V DC supply...
 

divindavid

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anyone knows simple circuit for boost driver? I d like to use 2.4V DC supply...
Boost drivers can be DIY'ed but are much more difficult and require many more components than a typical linear regulator. Your best bet would be to buy a Flex Drive or other boost driver.
 




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