d0pefish Posted August 17, 2020 Report Share Posted August 17, 2020 Hi there! I just completed a build of the MB6582, and during construction I designed a small PCB to neatly hold some backlight LEDs for the rotary encoders. The PCB source files and installation details are all available here on my GitHub page, licensed under Creative Commons so that anyone is free to order their own or change it: https://github.com/dwhinham/encoder-backlight-pcb I have about 9 spare sets of 15 PCBs if anyone would like some. Shoutout to @Hawkeye for the inspiration and excellent control surface construction guide! I've got more pictures and a video of my MB6582 over on Twitter if you'd like to see: https://twitter.com/_d0pefish_/status/1295104812678291465 Cheers! 2 Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted August 17, 2020 Report Share Posted August 17, 2020 @d0pefish, that's a great job! Looks really perfectly built and i love the golden color scheme and the custom backlight PCB solution! Very well done! Many greets, Peter Quote Link to comment Share on other sites More sharing options...
latigid on Posted August 17, 2020 Report Share Posted August 17, 2020 Nice idea! Are they 0402 parts? Were they soldered by hand or preassembled? Quote Link to comment Share on other sites More sharing options...
d0pefish Posted August 17, 2020 Author Report Share Posted August 17, 2020 Thanks both! They're 0603 parts - small, but still quite easy to solder with some tweezers and a steady hand. I hand-soldered these 1 Quote Link to comment Share on other sites More sharing options...
Smithy Posted August 18, 2020 Report Share Posted August 18, 2020 Beautiful work! 1 Quote Link to comment Share on other sites More sharing options...
jojjelito Posted August 22, 2020 Report Share Posted August 22, 2020 (edited) Snagged a kit, my old LEDs with a diffusing plastic spacer are too dim. Gotta give the old box some TLC! Wonder which synth to place it on, or it I have deskspace left after my Hyper-7 mechanical keyboard excess? Edited August 22, 2020 by jojjelito 1 Quote Link to comment Share on other sites More sharing options...
dwestbury Posted December 5, 2020 Report Share Posted December 5, 2020 (edited) I finally got a chance to build and integrate these awesome encoder backlighting PCBs. With such a clever and functional design from @d0pefish, I had no excuses! The one impediment for me was having to learn some basic SMD soldering, but @Hawkeye's videos on the subject made it much easier ;-) I'm currently powering the lights with a 9v source, but I think this makes them a bit too bright and they illuminate the whole bottom half of the control surface. Edited December 5, 2020 by dwestbury 2 Quote Link to comment Share on other sites More sharing options...
d0pefish Posted December 5, 2020 Author Report Share Posted December 5, 2020 Congrats @dwestbury, it looks great! I'm glad you were able to get them assembled alright. Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted December 9, 2020 Report Share Posted December 9, 2020 Congrats @dwestbury - and welcome to the small and exquisite club of backlit-knob MB6582 owners! Best regards, Peter Quote Link to comment Share on other sites More sharing options...
dwestbury Posted December 10, 2020 Report Share Posted December 10, 2020 Humbled to be part of such a distinguished group! Appreciate all the effort to demystify the process and make the tools approachable :-) -Darrell Quote Link to comment Share on other sites More sharing options...
m00dawg Posted December 11, 2020 Report Share Posted December 11, 2020 Yes I agree with Hawkeye, beautiful work! Curious, how taxed does all this make the 5V rail? I was looking at LED choices (should I be unable to repair my old control surface and have to solder together a new one) and the number of LEDs on the panel given each LED's mA had things at like 2.7A if I did my math right. That's well above the 1A max of a typical 7805? I'm using the fancy 5V switching regulator now often recommended but back when the MB6582 first hit the scene as it were, a regular 'ole 7805 was the norm. Seems like it worked fine as far as I have seen, but curious? Sorry kinda hijacking the thread here but since the LED knobs add even more power draw, thought I might ask the question. Definitely has me thinking about doing lighted LED knobs though, they're awesome! Quote Link to comment Share on other sites More sharing options...
dwestbury Posted December 11, 2020 Report Share Posted December 11, 2020 Encoder backlighting could add as much as ~840mA in power draw to your MB-6582 (e.g., ~14 encoders with 3 * SMD LEDs @ 20mA peak ea.) Before I decided to go for it, I measured the total load of my MB-6582 @ ~650-700mA, which included the mainboard (with 8x 8580 R5 SIDs) and the standard fully populated control surface. My build is using the RECOM 5v SREG @ 1.5A (mouser: 919-R-78B5.0-1.5), which still has plenty of headway, but I decided to tap into the 9v line anyway, based suggestions in Dale's documentation (https://github.com/dwhinham/encoder-backlight-pcb). As I mentioned above, 9v seems to be a bit much for my taste, because *the lights are blinding*... So, I'll probably look to step that down to find the sweet spot. 1 Quote Link to comment Share on other sites More sharing options...
d0pefish Posted December 11, 2020 Author Report Share Posted December 11, 2020 Yes - you definitely want to experiment with resistor values before you buy a whole bunch of them and solder up all the boards. For my yellow LEDs, they were bright, but not excessively so - your mileage may vary depending on LED specifications. :) Quote Link to comment Share on other sites More sharing options...
dwestbury Posted December 11, 2020 Report Share Posted December 11, 2020 (edited) On 12/11/2020 at 9:08 AM, d0pefish said: Yes - you definitely want to experiment with resistor values before you buy a whole bunch of them and solder up all the boards. For my yellow LEDs, they were bright, but not excessively so - your mileage may vary depending on LED specifications. :) Couldn't agree more... In hindsight I made 2 rookie mistakes: 1) only buying the 150 ohm SMD resistors (leaving myself with no choices) and... 2) testing with a 6.6v battery source, because I was only concerned with functionality and I didn't even think about final state brightness levels while I was building Now I'm thinking that a useful course correction could be to install one of these thumbwheel pots into the side of my case, since that would allow me to adjust the LED levels to taste, depending on room brightness, etc. Keep everyone posted if I ever get there ;-) Edited December 13, 2020 by dwestbury Quote Link to comment Share on other sites More sharing options...
m00dawg Posted December 11, 2020 Report Share Posted December 11, 2020 ooooh the thumbwheel is a great idea! Adds even more cool-points and polish to the build too! Quote Link to comment Share on other sites More sharing options...
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