istel

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About istel

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    MIDIbox Newbie
  1. AOUT problem

      Sure. This is correct right:      J19:Vs -> AOUT Vs    J19:Vd -> AOUT Vd    J19:SO -> AOUT SI    J19:SC -> AOUT SC    J19:RC1 -> AOUT CS   I just can't find any mentions of the AOUT and the LPC1769. This is taken from the 016_aout tutorial where it is the STM32 which is being discussed. But as far as i understand it should be the same for the LPC?
  2. AOUT problem

    Ok, so i just got away from this a little while and came back with fresh eyes. The b11 and b12, b21 and b22 etc are supposed to be connected with jumpers on the male pin headers if i just want unipolar out, right? If i want bipolar i can make the little schematic shown on the AOUT page with a trimmer and some resistors...   I am now going to check out if there is any problems on the core, since i get quite irregular results when i turn on the core - for instance the red LED just lit up on channel 1 and yesterday it did on channel two. Doesn't seem like there is any bad connections on the AOUT board, so i am thinking it is something from the core..
  3. AOUT problem

    OK, i doublechecked the connections between core and aout and it seems it is correct.    When i turned on the core the first time afterwards, the red led on ch 1 lit up for a few seconds, but when i rebooted the core it didn't do it again. Something isn't right with the connections and i am going through my soldering work on the AOUT now.... hmmm!   I also checked all the power supply connections now and they also seem to be good - ie. +/- 12v for the tl074 and 2.048 for the max525 (i measured 2.050, should be ok, yeah?)
  4. AOUT problem

        I am actually running the 016_aout tutorial, but maybe i should try out this example you're giving here..    I have connected the J19 like this:     J19:Vs -> AOUT Vs    J19:Vd -> AOUT Vd    J19:SO -> AOUT SI    J19:SC -> AOUT SC    J19:RC1 -> AOUT CS   That should be correct, right? It is taken from the readme in the 016_aout tutorial.    I'll just run through things and doublecheck here and there :)   Thank you Torsten
  5. AOUT problem

    The Gate LEDs don't light up either, shouldn't they be doing that in the tutorial application? I think i should try and just run through all connections on the aout board. It might also be the 6007b shunt which isn't sitting correctly. 
  6. AOUT problem

    Hi   I feel i ask a lot of questions on this forum, but i am very grateful for all the answers   I am currently building the AOUT (orig version) and i just finished the bipolar PSU, plus the board and tried hooking everything up to the my LPC1769 core   The LED lights up on the AOUT and i am running the AOUT tutorial, but i can't figure out if everything is working correctly. I have tried measuring the different outputs on the board with my multimeter but i get a constant reading of around -10v on all outputs, thinking this isn't correct   I am sending loads of different notes and velocity and i can't seem to get it to change values. I had first plugged it in without the bipolar PSU, but figured out that this was actually necessary for the tl074, so i am a little worried these might have taken damage? I think i will try to swap them out and test again and otherwise go somewhere i can measure with an oscilloscope instead.   Any ideas or experiences? I tried searching but couldn't find very much about the AOUT   Thanks again for all the help!
  7. EADOG xl 160-7 - same as the DOGM wiring?

      I am quite sure that i have stored the LCD params. I run the lcd_width, lcd_height, lcd_type, lcd_num_x and lcd_num_y and then store afterwards. It says it is saved. I see how it shouldn't be the operating system, but for some reason it is only when sending applications from his computer that we have the issue.    We'll try out the small font, seems like it would be worth it. Saving every pixel!! 
  8. EADOG xl 160-7 - same as the DOGM wiring?

    Yeah, this is so nice!! Before it was only a 2x16 CLCD, but this can show so much more info!!    But we are having slight issues - we are two persons working on the software, one OS X and the other is Linux. Every time my friend tries to send an application to the device the screen will fail, and we have to flash the bootloader, update LCD settings and then send the application from my computer (OS X). Is there somewhere where the bootloader config is being set without us knowing? It seems that everytime he tries to send over the application something is being reconfigured with the LCD and it has to be set back to DOG_GLCD, etc etc..    Here is the prototype (!) :)  
  9. EADOG xl 160-7 - same as the DOGM wiring?

    Hehehe! Yes, slightly adventurous! Now it works - i see how it looks a little funny, but i think everything is wired up correctly now.. The error was the caps - i had read the wrong value in the schematic, i thought it say 0.2 uf and not 2 uf :) swapped them out and now it works!
  10. EADOG xl 160-7 - same as the DOGM wiring?

    Okay, so i tried making it work today. Made a small proto-board to mount the display on and i think i have made the right connection. If i measure on it, there is 3.3 v where there should be. I have updated the bootloader config to the dog_glcd and set the resolution to 160x104 and it seemed to say it stored it and when booting the core the MIOS terminal says initializing LCD #1, so i think it got it. I tried running the 021_glcd tutorial and i have updated my ~/.profile and set the lcd to the uc1610. In there as far as i could see the resolution was already set to 160x104, so that should be in order. The code compiles, but when i try to plug in the display and boot the display shows nothing. I haven't got the backlight, but i would imagine that something would still be showing or some sort of sign of life? It should show the "Tutorial #021" (...), but it doesn't.. I am not sure how to debug this. Here is two pictures (The ribbon cable goes to LPC1769 core J15) and
  11. MidiBox CV and Quad IIc Module on same core

      This sure looks like there is a STM32F4 PCB in the works....... :)  Interesting!! 
  12. Bipolar +/- 12v PSU, what caps?

    Didn't see all the replys on this topic - i was planning to build this just for the AOUT, but maybe i could switch out the transformer to get more current and tap out 5v DC for the core also? Only having one power supply would be nice :)    I ordered all the stuff, so now i am just going for this, but next time i'll check out the Meanwell.   Thanks!   Isak
  13. Bipolar +/- 12v PSU, what caps?

      Hmm, i'll just check this out.. Thinking i will make the other one, but i'll see. :)
  14. Bipolar +/- 12v PSU, what caps?

    Thank you Shuriken   Trying to get my head around these electronics one step at a time :)   Isak
  15. Hi   I was looking for a straight up BOM for the +/- 12v PSU for the AOUT board, but i can't seem to find any, so i am trying to gather the components for myself based on the center-tap transformer mode http://www.midibox.org/dokuwiki/doku.php?id=bipolar_12v_psu#center_tap_transformer   I was thinking this setup: Transformer: http://www.reichelt.de/Transformers-PCB-5-0-8-0-VA/EI-42-14-8-215/3/index.html?&ACTION=3&LA=5&ARTICLE=27411&GROUPID=3316&artnr=EI+42%2F14%2C8+215  Rectifier: http://www.reichelt.de/Rectifiers/B40C800DIP/3/index.html?&ACTION=3&LA=5&ARTICLE=4639&GROUPID=2998&artnr=B40C800DIP 7812 and 7912 (pos/neg 12v)   But the caps i am a little confused about - in the guide it says a general rule is 470 uF per 0.1 ampere - the transformer will provide 2x167mA - Meaning something lik 2x470uF on both sides, so around 1000 uF caps - and here i need 1 electrolytic and 1 cheramic for pos and neg side before and after the 7812/7912 - correct? To sum it up: 4 x http://www.reichelt.de/Electrolyte-Capacitors-105-C-1000-5000h/RAD-FC-1-200-16/3/index.html?&ACTION=3&LA=2&ARTICLE=84701&GROUPID=4000&artnr=RAD+FC+1.200%2F16   and then 4 x cheramic/film non-polarity? I can't find any on reichelt with the right specs, they are all in pF which seems like to little (http://www.reichelt.de/Ceramic-Capacitors/2/index.html?&ACTION=2&LA=2&PROFID=256&GROUPID=3159&SHOW=1)..    Hope it makes sense - i am just a little confused with the cap values actually?    Thanks!    :smile: