Zam

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Everything posted by Zam

  1. Bi-Polar Question

    as I say, it's a OSC modulator, not a note CV, you have to think it as a "pitchbend" maybe that's why you encounter strange behaviour, if KB trig and/or sample & hold circuit keep some voltage at IC9/Q2 output, then your ext CV at R13 is just adding/subtracting to sum amp what's coming from R48... I suspect you should "reset" KB trig in the mean time you gate from external if you want to use J1-4 to "play" a note Best Zam
  2. Bi-Polar Question

    Side note: this entry point CV at summing amp is a OSC modulator, you won't trig note here ! nor modulating the filter via key
  3. Bi-Polar Question

    Find the connector end, redundant to the external filter jack !!! For the math, I see that we have a 1 octave sw that send 9V to sum amp via 450K (442+20K trim, I suspect 450K nominal calibration setting) I deduce that 1 octave is 20uA for the summing amp... after that it's all ohm law again... Best Zam
  4. Bi-Polar Question

    Update. My math confirm your 3V/oct at J1-4 If you want to use 1V/oct CV you can change R13 from 150k to 50k, maybe it's the simplest option... Best Zam
  5. Bi-Polar Question

    OK... I think that you maybe do this the wrong way. (I just find the whole service manual for the satelite) Let try this: First, measure Q2 emitter voltage (junction Q2E/R48/R51) for lower key press, and higher key press, you'll have the KB voltage range that feed the summing amp... I suspect you won't have a +/-4.5V range here... this will define the requested range at R13/A22 junction for the same behaviour at summing amp as summing resistors have same value (R13 and R48) Only when we know that we can go further... (and maybe just change R13...)   I guess you won't have any correct result whatever CV system you use if we don't clear this.   Best Zam   side note 1, as this "accessory socket" is offered with +/-9V(J1-1 and J1-3) for the external pot biasing or whatever you use to initially modulate at A22, I guess that's the limit you can feed to the summing amp (whatever the scale VS octave is) side note 2, I don't find J2-3 (coming from J1-5) which might be for trig ???    
  6. Bi-Polar Question

    I don't get why it don't work ? Did you follow the calibration procedure ? I guess in your use case you need to measure which note is 0V when playing your KB (should be the one in the centre of the key...), then play this note from midi and adjust offset trim to read 0V at DMM, or a tuner at audio out to read the same note as KB play. Then via midi send the lower note your KB is able to produce, and adjust the gain pot to match (at this point you should read close to -4.5V at DMM). Check with the higher note KB is able to produce. Check again with 0V note and if requested do the process again. In the mean time I find the schemo, your moog is mainly +/-9V, I don't see why after calibration you can't send lower and higher note/CV to your oscillators (up to +/- 9V), if your AOUT_NG modules is supplied with higher bipolar (+/-12 or 15V), you can zener limit at your gain opamp FB. By the way, important point, where are you inputting the external CV ? Best Zam    
  7. Bi-Polar Question

    Hello I suspect you "only" have to define your specific table for AOUT modules, so that the full scale DAC output (rescaled from +/-4.5V) give a 3 octave range (if that's what I get for your usecase) aout_hz_v_table.inc http://svnmios.midibox.org/listing.php?repname=svn.mios32&path=%2Ftrunk%2Fmodules%2Faout%2F   OR you use the actual HW and SW and scale/offset (buffer/opamp gain) to the step you need, which will over scale (at extreme high and low midi note play) your moog CV input. A schemo will say if it can handle without trouble the extra voltage (maybe just more octave to be played...) or if you need a voltage protection at CV input, you can also just power your AOUT modules with same bipolar voltage as the moog... Best Zam  
  8. RTP MIDI System

    Hello   With 68 midi I/O guess Vangelis just joint the forum Joke aside, I'm not sure you will gain in connector count by using RTPM in your use case, RJ45 will replace USB wire, but not all DIN5... If you build some boxes that route let say 8 midi i/o to RTPM it will more or less equal to what you already have Still RTPM have benefit over USB. Why don't you dispatch your midi i/o devices in various FX/syth rack at the first place ? Best Zam  
  9. Using AOUT with Buchla 1.2v/octave

    Hi Oops yes you'r right, I don't take attention to the requested output voltage value, IIRC TL07x are not rail to rail Datasheet need to be checked.. Best Zam
  10. Using AOUT with Buchla 1.2v/octave

    Hello There is no mystery to calculate opamp gain, feed the resistor you need for the correct output range. Best Zam
  11. CV outputs in MBNG

    Hello 55 DA is a lot, as say MB_NG only support 32 AOUT (per core) So far there is no MUX option for AOUT_NG. AINSER scan is not a issue, we have the muxed version for 64 pot So you need two core, which can be a good option, or even 3, two for data scanning and HW handling and one master for Midi IO and multicore dialling, MCAN connection between all    Midi offer 16384 control with 16384 steps (14bit)... we call this NRPN At NG side, I'll recommand to use NRPN data for all your "more than 7 bit" data, and just use map definition to scale to/from whatever bit deph or range you need.   Best Zam
  12. MIDI 2.0

    Hi all NAMM 2019, midi 2.0 prototyping announced. Should concern midibox at some point in the future, I guess. https://www.midi.org/articles-old/the-midi-manufacturers-association-mma-and-the-association-of-music-electronics-industry-amei-announce-midi-2-0tm-prototyping Best Zam
  13. AOUT NG Troubleshooting

      Hey To me it look like... There is not that many part at AOUT_NG... the weakest being the DAC Just double check your measure at TLV5630 output with the TL074s removed Best Zam    
  14. More CV outputs - how?

    Hello   I'm talking about AOUT_NG http://www.midibox.org/dokuwiki/aout_ng#the_pcb Have a search in the forum, someone do the test times ago and it work (MB_NG) You have to chain the TLV at DOUT pin and enable 32CV at .ngc file configuration (supposed you run MB_NG on a stm32F4) Best Zam
  15. More CV outputs - how?

    Hello Welcome here !   IIRC you can chain 4 AOUT _NG (12bit TLV5630), meaning 32 analog out, but core are small now, you can have two (even linked in the same box) for 64 CV out Most 80' synths (for those I know) use multiplexing and low def DAC, not realy comparable with modern DAC Best Zam
  16. MCAN

    Great if it's fine... at some point I realise that maybe I push a little as uncomfortable to "ask" because I can't really help community on this subject (except beta testing...) I'm sure it will be useful for many pple as soon as it get full implementation at MB_NG Best Zam  
  17. MCAN

    Hello Thank to both of you to take care of this So far MCAN seem a great feature !! Best Zam
  18. MCAN

    Hello TK (and happy new year )   based on @Antichambre trunk (he share with me for beta test) I mod and compile MB_NG here is notes of what I do to have port accessible from .NGC (don't remember yet if router work...) I test all this weeks ago, but EVENT send/receive proper midi data between cores linked at MCAN pin with the extra 4 digit definition at port=   So far I don't succeed to use MCAN port at .NGR  (don't remember why I do this at mbng_file_r...) The idea is simply to have MCAN fully integrated at MB_NG like any other midi port. Best Zam
  19. midiphy SEQ v4+

    Hello Despite I don't really have a need for this great tool, I'm happy to see the community releasing new toys Big BRAVO to all of you involved in this development Best Zam
  20.   Hello Sorry but no, differential mean the signal is duplicated with 180° flip at sender, meaning at the reconstruction side (receiver) interference and external noises will be nulled. Then there is various "option" if you want to isolate both side, like opto or transformer But in DC coupling case you better have the same reference.   About the general topic and "distant" communication between our lovely MB_HP tools I'll hope @Antichambre will chime in and talk about MCAN I don't want to spoil his work, but I partially beta test it (MB_NG) with very promising result   Best Zam
  21. Nachtwächter

    Ho merci Bruno ! yes this one work particularly good Best Zam  
  22. Nachtwächter

    Hello Midiboxers I usually produce albums and tracks for other so I don't post /communicate that much personally in the web/forums about these works. This is a particular one, I do with a great friend of mine. Hope you'll enjoy it Nachtwächter Best Zam ps:there is some midibox tools involved, GOOM ported to midibox in one track, as my fader automation at mix (analog) running on MB_NG
  23. Hello Differential don't mean floating, so far MC3486/3487 are not isolated (trafo or opto)...so I suppose you need a proper and common 0V ref at both sides... Also shield and 0V are two different things (even if it connect together somewhere eventually) Best Zam  
  24. AOUT_NG Eurorack format

    Hello I guess max525 have better spec than tlv5630 Best Zam
  25. Blink LED with NG (Code-Sharing)

    following with interest... can be merged with this: best Zam