What value should R5A and R6A be? Hawkeyes thread says 220ohm, but in the Mouser BOM it is two 220 ohm short for this but includes 2 x 470ohm resisters that I see no other use for.
The Mouser BoM for the CS board also lists 1 x 1kohm resister. What is this needed for?
Hi and welcome to MIDIbox, great that you are building again!
The BOM may use other LEDs than i used in the old tutorial and therefore it may reference different resistors for these different LEDs, which may explain also the 1k resistor.
But: normally no damage will occur (for normal LEDs and normal resistors > say 100 ohms), only the brightness will vary.
So: you could easily exchange the 220ohm for 470ohm resistors you have on hand, the corresponding LEDs will just not be as bright as the others.
Trick: if you have more 470 ohm resistors, you can “parallel them” to get effective 235 ohm resistors, which is close enough to the 220 ohms that you won’t see an optical difference - you can even “piggyback” them later on, by just soldering another 470 on top of an existing one
Many thanks for the quick reply. I was up the shed soldering the encoders when I saw your reply on my phone. I used the 470’s since I don’t have 220’s, but I have spare 470’s so could piggyback as you suggest if needed.
Your thread and the other blog have both been so useful, thank you Peter and Nicholas.
I have been hesitating for a couple of years about giving it a go but decided to take the plunge just before Christmas.
I think I have now finished the soldering aside from the LED’s. I will do these when I have the case (shipped today, so should get it early next week). Time to order some standoffs etc for the mounting.
Powered up tonight, midi connected to a synth and it worked first time (once I realised I had to change the mid port from USB to midi). So happy and relieved.
I still have the main encoder and LED’s to add but will wait till the case arrives next week.
A big thank you to all those whose guides gave me the courage to take this on.
You can see the LED orientation in this image on the lower right side. All LED’s are like L17 in the image they have their cathode facing right, except L31 which is reversed and faces left. Just place your LED’s flat side so they line up with the flat side silkscreened on the PCB.
I have figured out all of the LED’s so far (and working nicely) but I am still unsure about number 31. This has 4 holes. Am I right looking at the circuit above that it goes in the middle two holes?
Ok, I have tried every permutation of their four holes and orientation of the LED for number 31. It is either permanently on or it doesn’t light at all.
Can you try another SD Card and see if the error repeats? I’m assuming you have formatted it correctly and placed the hardware HW file on the card it is <4gig.
