I worked with you a bit on this yesterday. Can you send a schematic of how
you have the LM317 hooked up?
On Fri, Aug 24, 2012 at 9:46 AM, Sameer <par...
> Hi everyone-- question about the LM317 --
> I've been using the LM317 to power the LEDs just fine, when last night at
> Resistor it was suggested that I actually measure how much current I was
> putting through the LEDs. I did that and it turns out that when I have all
> 7 LEDs in series I'm only running about 180 mA through each LED. Now the
> consensus was that this is probably fine because with all the LEDs running
> at full current it could actually cause vision damage (and because it's IR
> you won't have a reflex to close your eyes).
> However, I am curious why this is, does anyone have ideas?
> When I run the circuit with no load, I get 704 mA. With just one LED I get
> just about 698 mA. I don't think it is because the battery has any internal
> resistance/current limiting. I'm using a 2200 mAh 30C LiPo, which means it
> can spit out 66A right? So that should be more than enough I would think.
> You received this message because you are subscribed to the Google Groups
> "NYCResistor:Microcontrollers" group.
> To view this discussion on the web visit
> To post to this group, send email to
> To unsubscribe from this group, send email to
> For more options, visit this group at