Hacked pulsed laser driver using Arduino

[neanderthalphysics]

OK, how would you improve it?

 

[rbelli1]

How to use a transistor to drive an LED

Your circuit only works because the series impedance of the battery is high. If you put that on a strong enough battery you would instantly explode the transistor.

BoB

 

[neanderthalphysics]

Thanks for the article. It is very readable and explains basic concepts which I have forgotten from my mammoth hunting classes.