I have a 403nm diode right now

running on 90mA from a 9v battery through a 4.5V voltage regulator.
Is there any particular circuit I should be using? And good driver schematics I could get?
I tried searching on here but I got confused.

There is a circuit called the DDL circuit that a lot of people used to use, it is an adjustable voltage/current regulator, but we just use it as a current regulator. Most people just by small SMT drivers that fit in an Aixiz module in the B/S/T section.

Theres a driver schematic i made on ms paint , its the ddl one , made of available parts from radioshack and other local electronic shops like frys electronics.

Let me see if i find it

nvm : i need 3 more post so i can put pics up

basically its the list below

-lm317t curren regulator
-100ohm pot
-33ohm resistor (to be on the safe side but im using a low "--" ohm resistor , still working)
-n4001 diode
-47uf 16v cap

here it is , this is what im using , not perfect but u get the point