Laser Engraver Circuit Help
I have some questions about the circuit that im going to use:
I have seen the typical LM317 circuit for laser diodes (LINK HERE)
I dont completely understand the circuit Groover made. He says that he uses the LM317 circuit over, but it does not look exactly the same.
Can someone explain to me a bit why his values on the resistors/capacitors etc. is so damn different? (Though he also use relays and stuff for outputs for fans ) (LINK TO GROOVERS CIRCUIT)
I made my own circuit that uses the typical LM317 circuit over, but will my circuit work fine? (Instead of the battery in the circuit, I will connect the Voltage In-ping on the LM317 to my arduino, but not exactly sure where to connect it on the arduino since i need about 7.5 V in, and not sure if the arduino got a pin that can output that much?) (LINK TO MY CIRCUIT)
Thank you for your reply!