I just purchased a MK2B dual-power heated bed to use on my Mendel90 project, using a 12-volt power supply (hacked ATX 600 watt PSU). What value/type/voltage/etc. LED and resistor should I use on it? Anything that Radio Shack would have on the shelf, since we have one in town? Yeah, I know they're optional, but it would be nice to have a visual indication that the bed is turned on. https://reprap.org/forum/read.php?13,411653,411653#msg-411653 Wed, 10 Jun 2026 05:32:09 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,411653,421254#msg-421254 https://reprap.org/forum/read.php?13,411653,421254#msg-421254 Rich K. Controllers Sat, 18 Oct 2014 16:03:07 -0400 https://reprap.org/forum/read.php?13,411653,421160#msg-421160 https://reprap.org/forum/read.php?13,411653,421160#msg-421160 jbernardis Controllers Sat, 18 Oct 2014 12:48:18 -0400 https://reprap.org/forum/read.php?13,411653,421147#msg-421147 https://reprap.org/forum/read.php?13,411653,421147#msg-421147 Rich K. Controllers Sat, 18 Oct 2014 12:24:18 -0400 https://reprap.org/forum/read.php?13,411653,417960#msg-417960 https://reprap.org/forum/read.php?13,411653,417960#msg-417960 enif Controllers Sat, 11 Oct 2014 08:21:59 -0400 https://reprap.org/forum/read.php?13,411653,417879#msg-417879 https://reprap.org/forum/read.php?13,411653,417879#msg-417879 dc42 Controllers Sat, 11 Oct 2014 03:34:52 -0400 https://reprap.org/forum/read.php?13,411653,417851#msg-417851 https://reprap.org/forum/read.php?13,411653,417851#msg-417851 Dust Controllers Sat, 11 Oct 2014 00:32:44 -0400 https://reprap.org/forum/read.php?13,411653,417839#msg-417839 https://reprap.org/forum/read.php?13,411653,417839#msg-417839
Not having dealt with LED's very often, I am wondering - will they burn out if you try to run current through them backwards? Or will they just not light up? I know my MK2B heated bed has a place where 2 LED's can be soldered, and from what I understand that is so that it doesn't matter what polarity you have the bed hooked up, one LED will always be lit.]]> Rich K. Controllers Fri, 10 Oct 2014 22:03:59 -0400 https://reprap.org/forum/read.php?13,411653,411860#msg-411860 https://reprap.org/forum/read.php?13,411653,411860#msg-411860 led.linear1.org]]]> jaguarking11 Controllers Thu, 25 Sep 2014 12:06:59 -0400 https://reprap.org/forum/read.php?13,411653,411678#msg-411678 https://reprap.org/forum/read.php?13,411653,411678#msg-411678 jbernardis Controllers Thu, 25 Sep 2014 01:14:18 -0400 https://reprap.org/forum/read.php?13,411653,411653#msg-411653 https://reprap.org/forum/read.php?13,411653,411653#msg-411653 Rich K. Controllers Wed, 24 Sep 2014 21:38:46 -0400