Here is how I created the 66K5 resistor for the calibration of TM403 env2 to vco adjust.
Since I do not use through-hole resistors, I had to make it with 2 surface mount resistors.
Made with a 10K (0603 size) and a 56K (0805 size) in series.
Surface mount is perfect because I work with SMT daily and build full circuits with 0402 sized resistors.
I did not have to separate the PCAs to do the rework.
I wish there were more SMT kits, but the DIY community doesn't do much SMT.
I would love to see this entire x0xi0 synth on a singe board using SMT parts.
I assembled the entire box, except for a couple of the pots that have to be glued.
I played and tested all the functions again. All good.
I then pulled all the guts back out because I did not like the brightness of the x0xi0 LEDs. Too bright and intrusive
.
Actually they were not the stock LEDs, they were ultra-bright cyan LEDs that I had swapped in.
(I have already done much rework of the same ilk on the main board (long ago) for all the custom LEDs I used on the sequencer)
I changed R483 which is the current limiting resistor for the ACC DECAY LED from 1K to 10K.
I changed R468 which is the current limiting resistor for the ENV DECAY LED from 1K to 10K.
I changed R476 which is the current limiting resistor for the GATE LED from 10K to 20K.
I changed R486 which is the current limiting resistor for ENV2 LED from 2K2 to 10K.
I changed the current limiting resistors for the HI RES and HI CUTOFF Leds form 1K to 20K
And I changed the current limiting resistor for the TEMPO LED on the main board to reduce its brightness too.
Now all the LEDs are perfect illumination.
I did not have through-hole parts, so I used 1206 sized surface mount resistors and on the longer lead spacing, I even added a jumper to accommodate the gap: