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Found 11 results

  1. From the album: Hawkeyes MB stuff

    Finally...! :) https://www.midiphy.com/en/shop-details/137/50
  2. As you probably know, the AOUT module is set up to support 1v/octave scaling, and that has been fine for me when I was using it with a Serge modular system. But I have been wondering how I could use my AOUTs with my Buchla-ish modular synth, which uses 1.2v/octave scaling. I contemplated building an opamp based solution, boosting the voltage a bit. But this seemed a bit of a hack to me, so I spent a bit of time understanding the opamp based outputs from the MAX525 DACs. I realised that by tweaking a resistor value I could get the AOUT to put out 1.2v/octave. I've tested this for a bit with two different oscillators (258r and 259r) and it seems fine for my uses. I'm no electrical engineer though, so if this mod blows up your rather expensive equipment I'm afraid you're on your own... That said, for any other Buchla users who want to use an AOUT to output 1.2v/octave, just change RY to 1.8K on any channels you want. That should give you the extra bit of gain required, and then you can trim it to 1.2v/octave. FWIW I usually use the MBSeqV4 app, then use the nice new calibration stuff to get things super accurate. I'm able to get submillivolt accuracy over the whole voltage range. Top voltage is obviously a bit higher in this case, almost 13v from my measurements. That seems to have been fine in my system, but YMMV. Also, I have set my AOUT so that V1-V4 have this tweak (1.8K for RY), and I use them for controlling Buchla oscillators. V5-V8 use the 2.2K resistor for RY still, and I use those channels for modulation CVs and to control the Serge oscillators which run at 1v/octave. All in all I'm most happy with this system and am glad I don't have to mess around with adding more circuitry. Hope that helps someone in the future!
  3. I want to use my MIDIBox Seq as a way to play four monosynths (using CV/Gate) as a polysynth from a MIDI keyboard. The manual says this can be done with the FX Duplicate but I have had no success after hours and hours of trial & error. I have G1T1 set to AOUT/1, G1T2 set to AOUT/2, G1T3 set to AOUT/3 and G1T4 set to AOUT/4. If I put notes into those four tracks they play perfectly as they should. But when I try to route live MIDI notes in, I never get the monosynths playing the different notes. I am running ver 4.092 thanks for any help! Andrew
  4. Lately I've been trying to use the extra functions of the CV-Gate out, specifically the possibility to send velocity with key values. From the manual: When I use AOUT - channel 9 I get key and velocity from the first two CV's out, as expected. But only gate #1 is triggering. When I switch to AOUT - channel 10, I get key and velocity from the second pair of CV's out: 3 and 4. And gate #2 is firing. What I expect is when I use AOUT - channel 9, is to get CV's from 1 and 2, and gates on #1 and #2. This is consistent through the whole range of outputs. All the other functions work exactly as expected, the drum gates and the clocks nothing wrong. I found this advise: And I've scanned through the entire config, but pretty much everything is standard. I use the Wilba Front panel with the AOUT-NG with the DOUT. Here is my HW-V4: https://pastebin.com/M9aXWjEx Am I making a mistake assiging SR's? Or is it something else I'm missing? Thanks!
  5. Hi All, I have a question regarding the Dsub 25 output connector that I would like to use without the transmitter PCB, but with a Aout-ng and D-out. Do I need to use a seperate ground for every output or can these be shared in some case? I mean is the max 12 outputs total; using 24 wires or can i get more my sharing the ground? Thanks, Cheers Tim
  6. mfk

    aout + dout

    From the album: Seq V4

  7. YEAH! Weihnachten ist gerettet!! Muss jetzt nur noch jemanden finden, der sich um meine Kinder und Arbeit kümmert. Ich habe zu tun...
  8. Altitude


    From the album: Altitude's pics

    Max525 Aout module with gate buffer/adjustable level shifter
  9. Hello. I'm testing AOUT module, and I don't have the same voltages on all 8 channels. I'm using for 10k Rx resitor, precision ones with 0.1% tolerance (and I picked by hand the same values from a lot). But even with the same resistors, one chanell gives me 1.0v-2.1v-4.2v-8.4v, one 1.1v-2.3v-4.6v-8.8v, one 1.0v-1.98v-3.8v-7.8v etc. Any suggestions ? I should test many TL074's until I find the right ones ? Thank you.
  10. istel

    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!
  11. 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:
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