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About Zam

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    MIDIbox Guru

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  1. Hello We can't call a resistor a decoupling device but you use " so it's ok. In this case I think it's a small voltage drop to ensure Vref stay below VDD, to avoid error at full scale, as I nether won't call 10ohm resistor a current limiting for Vref input with half an amp at 5V... If you use separate regulation you don't need this resistor. Best Zam
  2. Hi Tago I won't call someone who ask questions, trying to learn, as experimenting things an idiot ! Best Zam
  3. Hello Vref is your ref analog voltage, you need to provide the pot with the same voltage. Vref is the 100% value for analog inputs whatever voltage you feed.   Please check again the AINSER64, Vref connect to ADC as J6 to 13 for pots (and 4051 multiplexed analog switches)   Best Zam
  4. I'll say try both... it's cheap ! Best Zam
  5. Assign J5a/b core ports in .NGC

    You can mix IN/OUT at J10, but have to choose for a full row, a and b So if you want to keep spare for future SCS (at J10a) it's not an option... I'm sure someone can help you better than me for software side and J5 implementation Best Zam    
  6. Assign J5a/b core ports in .NGC

    Hey I can't help for J5 handle at lower level. Side question, did you already use J10 ? Best Zam
  7. Assign J5a/b core ports in .NGC

    Hello Tago Yes J5 ports are available at .NGC, as analogue input, EVENT_AIN with "ain_mode=switch" flag you can hook a button on it You have to enable the input pins with: Example: # AIN hardware AIN enable_mask=110000 will enable the J5A.A0 and J5A.A1 inputs. To connect LED I suppose you have to go deeper in mios32. If you use toggle switch (and not tact switch) you can solve this with a dual pole version, one for the AIN and one for a LED directly powered by the switch. Best Zam
  8. The whole datasheet define it more or less like a zener, so I suppose there is no voltage drop, but a "voltage limiter" behaviour. Just my guess, but you better try a 4.1 version (4.096V) because if your 5VDD go down below 5V for any reason, your "precision zener" at 5.000V will follow. With the 4.1V version you have 20% margin before issue at analoge Vref. Best Zam  
  9. I mean 1mV per bit or 1.25mV per bit (according to different Vref, 4 or 5V) won't change that much if you have a regulator that clean the supply below or around mV noise/ripple, you'll still have jitter at 12bit but clean at 11bit or lower, which is way better than jittery 7bit for the OP ! Best Zam
  10. Hello Use the digital 5V close to the MCP3208 (coming from J19) and don't forget to use the same Vref for your pots or faders, be careful about load as this regulators don't offer that much mA at output (don't drive anything but ADC and pots)   Have a look at MCP3208 datasheet page 19 for design notes and coupling with the precision regulator Best Zam
  11. Hello Dedicated regulator for AINSER8 Vref help a lot... Unfortunately it will be difficult to regulate 5V from a 5V USB power (usual voltage drop at regulator) With the proper design it's possible to run the AINSER8 at 11bit without jitter and 12bit low jitter. As already mentioned, 0V path is also a key to achieve this result. Best Zam
  12. Hello Thanks TK for this update !!! I'll wait to have access to my Sierra computer as it don't work any more in my 10.6 computer. So 64bit only I guess Best Zam
  13. Just like "snapshot at power on"

    Hello Guess you don't set the fast boot on at bootloader ? Anyway you solved the issue which is a timing issue... good Best Zam
  14. Just like "snapshot at power on"

    Hello Seems ok but exit command ? So none of your CC get out at start-up? is the debug message say something like some invalid at ngr? To what device are you sending that ? Can you try to route these CC to USB port and monitor incoming data at your computer (eg: midi monitor for OSX) Best Zam