Laser surplus parts, are they any good for 405? See link

[freeloader700]

Get the TO-220 package right??

And now a 10 ohm res?

 

[Eudaimonium]

I prefer the SMD style,
100pcs LM1117 AMS1117 1.2 1.5 1.8 3.3 ADJ LDO | eBay

Very easy to work with. Besides, you don't need massive TO-220 for only 100mA or so. Once you get in more than half amp, or so, then you need heatsinking and more bulkier casings, but at that point it's a lot better to use switching drivers (either buck or boost), so it's a bit of a moot point.

 

[freeloader700]

Okay sounds good.. Thank. Now do you use a 1/4 watt 10ohm res?

 

[Ghostchrome]

Okay sounds good.. Thank. Now do you use a 1/4 watt 10ohm res?

10ohm resistor will give you 125mA


1.25/10 = .125

 

[Eudaimonium]

I just use SMD resistors of the needed value, I don't care about the wattage rating much. For lower currents, ofcourse.

You can calculate the needed resistance yourself,
1.25 / Needed current in Amps = Resistance in ohms

 

[freeloader700]

Okay so I might finally get it now. If I want 150 mA do this:

1.25/0.150=8.3

So 8.3 ohms then....sorry if I am not understanding. I've always had a hard time understanding current

I just use SMD resistors of the needed value, I don't care about the wattage rating much. For lower currents, ofcourse.

You can calculate the needed resistance yourself,
1.25 / Needed current in Amps = Resistance in ohms

 

[Eudaimonium]

Yes, that's correct, 8.3 ohms. You seem to be understanding current just fine

Let us know how it goes.