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About goyousalukis

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    MIDIbox Tweaker
  • Birthday 10/20/1973

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  • Gender Male
  • Location El Paso, TX, USA
  1. Track Divider on dedicated button

    Hi - did you try setting a bookmark? Check out the bookmark page at the end of the user manual: http://ucapps.de/midibox_seq_manual_m.html I haven't used this feature, but I believe you can assign a bookmark to a GP button. The bookmark includes the current page. I'll try it tonight.
  2. Bi-Polar Question

    Ah, yes, I see that J2 is the External Filter jack. So if nothing is connected to that jack, the accessory jack can be used to control the filter. I'll have to see if pin 6 is connected to anything. To me, it seems strange for Moog to provide a CV input with out some sort of gate. On my synth, the jack is actually covered by a plate with rivets, so I guess they decided to not pursue any accessories. Thanks for listing your math and deductions. I will try to understand it.  In your last comment, which CV entry point are you referring to? The J1 pin 4? I am not triggering there. I am sending an 8V trigger through a diode and 2.2k resister to the junction between R195 and C41. I first tried the 5v gate from the midibox. It triggered a note, but not at full volume. Once I scaled it to 8V, it works perfectly. That does give me the idea of adding velocity, or accents...  
  3. Bi-Polar Question

    Thanks - I posted on MuffWiggler, and the fine gentleman suggested calculating the appropriate resistor value, but I didn't know how to do it. I will try your suggestions today, as soon as I get home! I also searched for what the last two accessory jack points connect to, but I also couldn't find it. I will try to track them down. Then I could just make an outboard adapter without modifying anything on the original synth. Thanks
  4. Bi-Polar Question

    Hi Zam,  I have gone through the calibration procedure to some extent. The center key is at 0V. I'm sure someone more competent than me could get it done with opamps. I tried an opamp with a 1K and 2K resistor, which if I got the math correct will amplify the voltage by a factor of 3. So If I send a C# at .083v (1/12) from the midibox, it would amplify it to .25v, which is what the moog expects. When I did this, I did not get an in-tune scale. I then swapped the 2K resistor with a 10K pot, and trimmed it until I was getting perfect octaves from the Midibox. But then the scale between the octaves was not correct.  Here's the schematic from the satellite, which is much clearer than the MinitMoog schematic that is available. They use the same main board. I am applying the CV in to pin 4 on the accessory jack. This feeds into the DC Summer via a 150k resistor like the keyboard circuit does. If I get a chance, I will redo my opamp circuit and re-measure the voltages. Thanks for your replies Justin
  5. Bi-Polar Question

    Here's a quick video of my first test...  
  6. Bi-Polar Question

    Thanks Zam, the table would be easy to modify, but then all 8 outputs would be modified. I only need one bipolar for the Moog. The rest of my eurorack is all 1 v/o. I did try the opamp to increase the voltage by 3, but I couldn't get a scale  in tune. Last night I hooked up an Arduino with a 12bit DAC, and got pretty good results. Now I need to add the Midi part.
  7. Bi-Polar Question

    I did some work tonight, and was successful with using an opamp to scale the voltage from -4.5 to 4.5. I was able to get an octave in tune using a potentiometer, but of course a scale did not play correctly. When you say software, do you mean modifying the midibox code? I hadn't thought of that. I don't know if my coding skills are up to that. Now that I am brainstorming, perhaps it would just be easier to use MIDI instead. There are lots of examples of Midi to CV for arduinos. I would just have to customize the output voltages to match the voltages that I measure at each key. Time to do some more research. Thanks for your comments! Edit: This would also solve my problem of what to do if the midibox sent voltages to high. I am worried if I accidentally send more than 4.5v to the Moog.   
  8. midiphy gates/clocks module

    Thanks guys, I'll give that a shot. I unhooked the transistor a while back, trying different solutions, so I don't have a photo. It is for a Eurorack, so it is actually 12V, not 15. I was just using the schematic as a starting point. I was using the 220 ohm resistor. Sorry for hijacking the thread!
  9. Bi-Polar Question

    Thanks, but I don't think that would fix the issue. Even if I got the 10Vpp, it would still be at 1 v/o right? I actually need 3 v/o, since each semitone is .25v apart.
  10. midiphy gates/clocks module

    I was using the top right corner of this schematic from the YuSynth gate delay, except connecting the base of the transistor to the DOUT module.
  11. midiphy gates/clocks module

    That looks great! I took another route, and built a breakout panel in-between two rows of 3U in my case. I do have a quick question: In your circuit, do the lights blink even if nothing is plugged into the jack? (looking at the picture, it looks like it does). On mine, I have an LED installed, and I've gotten it to blink when it is driving something, but it doesn't blink with nothing connected. I tried a simple BC547 circuit, but no luck. If yours does, I would love to see the schematic!  
  12. Bi-Polar Question

    Hey guys, I am adding CV in and gate in to an old Moog MinitMoog. I have the gate sorted out nicely, and have moved on to the CV part. I changed one of my AOUT_NG channels to Bi-polar, and I see on the AOUT_NG uCapps page that the range is -2.76 to +2.75.  The issue I have is that the 37 keybed for the MinitMoog uses a voltage spread of 9V. The lowest note is -4.5v and the highest is 4.5v. So the difference between two notes is approximately 1/4v versus the 1/12v of a 1v/o typical CV. What strategy would you take to scale the 5.5v  spread to a 9V spread? If I use an opAmp to scale it up, will I get fairly accurate notes, or will it be really out of tune? I suppose another option would be to use an Arduino Nano to make a note table and convert regular CV to the right voltages. Just curious if you guys have any ideas. Thanks! 
  13. AOUT NG Troubleshooting

    Thanks guys - I havent had a chance to pull the OpAmp and recheck the voltages yet. I'll probably just settle for 6 CV outs.
  14. AOUT NG Troubleshooting

    Hey guys, I am looking for some help. I have a MBSeq4 with an AOUT NG connected with the line driver/receiver. 6 of the channels are working perfectly, but I have two issues: When I test the calibration for each channel with the output set at 8V, I get a constant 11V at output 5, and 0V at output 7.  I have checked continuity between the outputs and the opamp, along with verified the resistance. I have also verified continuity between the opamp and the DAC. When I measure the voltages on the DAC pins for a working channel, I get 3V. When I check output 5, it has 4v, and output 7 has 0V. Do you guys think I fried these two pins on the DAC?
  15. Need a pre-programmed PIC18F452

    Chips are in the mail...