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Laser Engraver Circuit Help Answered

Hello. I am making my own laser engraver out of 2 DVD burners just like Groovers version.
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!

Discussions

Your laser will turn on but,

won't turn off when it has to be.

Add a relay after the transister collector pin

0
user
aborge

3 years ago

I have tried, but no answer yet.

First, have you thought of asking this question directly to Groover?

Yes, I have but neither him or anyone else has replied to my comment/question and I asked it for a long time ago. So therefore I tried here

So do you have any help to offer? Or anyone else?