<![CDATA[ChipMusic.org - Power LED not bright]]> 2012-11-18T20:34:55Z PunBB https://chipmusic.org/forums/topic/9185/power-led-not-bright/ <![CDATA[Re: Power LED not bright]]> great thanks!

]]> https://chipmusic.org/Grymmtymm 2012-11-18T20:34:55Z https://chipmusic.org/forums/post/142652/#p142652 <![CDATA[Re: Power LED not bright]]> just use the default ratings in the pop-up box they give you (the question mark)

i notice there are two greens in the pop-up though.  use 2.2 as the value first, if its not bright enough, use the other rating.  i'm betting he's using ones rated for 3.xV, but don't want to tell you that and you burn it out for some reason...

150ohm should work fine, i'm guessing you'll end up with something close to that...  but, try out a 200-220ohm one first in case he's using one of the lower voltage rated green types

]]> https://chipmusic.org/kitsch 2012-11-18T20:27:23Z https://chipmusic.org/forums/post/142649/#p142649 <![CDATA[Re: Power LED not bright]]> ok well I used Nonfinites diffused power led and he doesn't have that info listed so then how do I know the diode forward voltage?

]]> https://chipmusic.org/Grymmtymm 2012-11-18T20:22:51Z https://chipmusic.org/forums/post/142646/#p142646 <![CDATA[Re: Power LED not bright]]> something like this: http://led.linear1.org/1led.wiz

that one is very basic.  if you needed to add multiple LEDs for whatever reason or for a mod down the road, and just want to skip the simple math, the google search will give you some more advanced versions.

thats really all there is to it!  easy peasy, lemon squeezy

]]> https://chipmusic.org/kitsch 2012-11-18T20:14:42Z https://chipmusic.org/forums/post/142645/#p142645 <![CDATA[Re: Power LED not bright]]> The input voltage is closer to 6v. 4 x 1.5v batteries.

]]> https://chipmusic.org/Apeshit 2012-11-18T20:11:31Z https://chipmusic.org/forums/post/142644/#p142644 <![CDATA[Re: Power LED not bright]]> its the resistor marked R1 on the LCD PCB. 

you can google "led resistor calculator", assume the current to be 20mA, the voltage source to be 5V, and it will spit out the resistor to use (depending on the LEDs own specs, which is the unknown variable you'll provide (i can't tell you))

or, google ohm's law and just work out the math the long way.  the little browser applet resistor calculators are nice though

]]> https://chipmusic.org/kitsch 2012-11-18T20:08:00Z https://chipmusic.org/forums/post/142643/#p142643 <![CDATA[Re: Power LED not bright]]> how do I figure which one to use?

]]> https://chipmusic.org/Grymmtymm 2012-11-18T19:54:56Z https://chipmusic.org/forums/post/142636/#p142636 <![CDATA[Re: Power LED not bright]]> LEDs have different input voltages. You will need to adjust the resistor.

]]> https://chipmusic.org/Apeshit 2012-11-18T19:53:20Z https://chipmusic.org/forums/post/142635/#p142635 <![CDATA[Power LED not bright]]> when I put in a green backlight on my DMG I also switched the power LED to a Green one and now it is not very bright at all.
it looks as if it dimming from low battery power.

and yes I tried fresh batteries

what up wit dat?

]]> https://chipmusic.org/Grymmtymm 2012-11-18T19:50:12Z https://chipmusic.org/forums/post/142634/#p142634