I am trying to understand your reply. Are you saying that 2 AAA batteries supply more than 3v. Or that a laser powered by one time use AAAs or rechargeables, needs more than 3vdc?
I think you are saying my problem is the current draw.
I want to supply 3vdc, hell I'll take 5vdc but need the current to equal the output of 2 AAAs (one time use or rechargeables).
I am told AAA cells can put out 1000–1200 mAh each, while my rechargables claim 850mAh each. How do mAh's relate to miliamps? Is it one to one? What do you propose the laser pointer needs?
I am aware that arduino pins only supply 40-50 mA. And while only a "junior member" of this forum, it is not that I do not understand ANYTHING nor do I understand everything. I am trying to learn by asking questions as well as experimenting.
Would the preferred order of operations include no experimentation and only taking advice of forum members? What does the number of posts on the ARDUINO FORUM tell the layperson about anyone's actual knowledge or credibility?
I am not looking for a fight or anything like that, and I do search the forums before going all willy-nilly and also before posting to avoid duplicate topics. I am looking for guidance. I will take advice, but without trial and error, how is anyone expected to learn?
Can the schematic provided give 3.3v or 5v but adequate current?
Could you also guide me as far as selecting proper resistors for Rb and Rl (I presume b for base and l for load) along with a 2n222 transistor to provide the laser 3vdc with an appropriate current as to prevent damaging the laser driver circuit or the arduino pin?
Of course I don't WANT to fry my arduinos. I am only looking for a logical way to POWER a laser pointer without batteries.
Thanks for the schematic!