sis.tm

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About sis.tm

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    MIDIbox Newbie
  • Birthday 09/13/1974

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  1. midiphy Eurorack Expander Modules

    Hi Andy, Yes calibration is fine but i notice soms strange things with the led Lights. Everything is working fine but i have a strange bad feeling with on off switching of the leds when going to other channels. I think a video will be better for me to post since i cant explain by words ;-) i don't know if this is expected behaviour or software bug etc. Will try to make a video this weekend. Bye Niels
  2. midiphy Eurorack Expander Modules

    Hi, I received the new pcbs and soldering of the dacs went smooth as silk.  I got a small question about calibration : i have put the midibox to max and see a green Light on the active cv. When i switch cv output to another channel all go green except one. Tried to switch dac boards but all the same issue. Calibration to 10v goes well on the cv with the issue. Only max calibration does strange things on 1 channel. Is this explainable? Cheers niels
  3. [Pending Sale] MidiBox Seq V4 with BLM 16x4 and CV/Gate

    Wow looking flashy!! Well done! Will inform some friends if they are interested   Cheers Niels 
  4. midiphy Eurorack Expander Modules

    Hi, yesterday i got myself the kester flux that @Hawkeye suggested and reflowed everything from Scratch and unbelievable but it works now!! All channels can be calibrated and working like a charm. It really is helpfull to get the perfect flux i suppose instead of the cheaper 1 i got. Still i am going for a new pcb because i already ordered the pcbs and mouser parts and i want the modules to be perfect. In a coupe of days i will post my final setup. For now many thanks! P.s. Maybe it is usefull to make a topic for soldering tips and tricks for other People. 
  5. midiphy Eurorack Expander Modules

    It would also be nice to do some lfo's from the midibox to a eurorack panel .. i am a sucker for lfo's 
  6. midiphy Eurorack Expander Modules

    I am not really experienced with the really tiny soldering like the dacs but experience comes with trial and error and it will probably work out this time, You can't always throw six :) 2 be continued
  7. midiphy Eurorack Expander Modules

    Nice case Thorsten! I am jalous at your CV panel :)
  8. midiphy Eurorack Expander Modules

    Hi,  I did some testing and SO is going all the way to the DAC board to the J19A and tested with testaoutpin sc 0 and 1  RC1 is going to the dac board all the way to j19a SI has a really low voltage on the dac and I hope that I measured it right but I get a 5v on pin 12 SO I first tried soldering your way since that is my way with chips like the opamps and they are very clean and reliable . With the dacs I got some joined legs and tried to remove it with the soldering braid but that killed 3 or 4 pads and hard to see if they are still there but I get no voltage whatsoever from 16 / 17 / 18 / 19 on the dacs so I think my dacs or pcb is /dev/null . After killing some pads I tried to do some drag soldering with a seagull tip and that worked pretty good but it was to late to clean up the massacre I did. :( Maybe ordering a new pcb and some new dacs and things from mouser is the next step. New update : I desoldered the dacs but the pcb and dacs are too much damaged. It was funny because when I powered it on I some some different colour leds but the psu was making some very slight noise and then they went red again. However it was a sign that the problem is around the dacs I guess. Don't wanna kill my psu so I shut the thing off and the pcb and dacs are going to /dev/null :( For now thanks for all your help! Cheers Niels      
  9. midiphy Eurorack Expander Modules

    Yes that is the screwup I did with some old desoldering braid and the pads where vanishing like clouds for the sun (Not a pcb issue but a total screwup from my side!) . I can't find any shorts for now but will reflow the pads one more time tomorrow to see if it helps. Without the J19 connected and CV board only connected by the eurocase power gives all lights red right away. I tested it also with the DAC board disconnected but again all lights red right away (don't know if this is a valid test :))). Tried different cables for power but all same result.
  10. midiphy Eurorack Expander Modules

    SO = 3.9v SC = 3.9v RC1 = 3.8v  
  11. midiphy Eurorack Expander Modules

      I am not exactly sure when I do example: testaoutpin sc 1 where to measure the pin sc . Sorry I am a real noob when It comes to troubleshooting these things since I didn't study electronics :)   
  12. midiphy Eurorack Expander Modules

      Thanks for the feedback, will try to meassure things tonight but here are some pics of me doing some bad soldering on the dacs and pics of the cabling (only Gatesboard does not have euro power at the moment). 2 be continued ;-)
  13. midiphy Eurorack Expander Modules

    Hi, the gates problem was indeed the midibox sending out an inverted signal. When changing in to positive it works also for the 2 other dout boards so i am confident that those are working good. So, 1 down of my problems. My biggest concern is the AOUT board and especially the DAC board. First answering your questions: * It is indeed -5v instead of +5v. Guess i am always thinking positive :) * jumpered the board so it is now powered by the eurorack psu instead of USB * I am using an official moog eurorack power cable, i have to mention something strange. When looking at Peters tutorial he i making the eurorack power cables like straight cables but when i compare them to an official eurorack psu cable they are all twisted. Difficult to explain but when i try to use the cables like Peter is making them i dont get any power. When i also twist them like a moog eurorack psu cable it is working perfectly. I really 100 times checked the video and i know it is exactly the same but no power. BTW this is only with the eurorack psu power cable but the module interconnect cables are working like how they are made in the video (confirmed by testing the gate/clock panels).  * I think i screwed up with the DACs .. they were so tiny that i resolder them a couple of times. For all the boards i made i am 99% confident that the soldering is good. But with the DAC board i have a 20% good feeling and i think i killed the DACS. When the DACS are killed do i get the default -5v and what if only 1 is failing? Is there a good way to test the DAC board?      
  14. midiphy Eurorack Expander Modules

    Hi, I installed all the modules and like to calibrate but when i power on the a1cv board all leds are all lighted red and when meassuring voltage all inputs have 5v. Do you know in what way to look?  Gates board is working fine, only my first channel 1 led is always burning (only when connected with my midibox) but you can see it's triggering. All other channels are working like a charm. Cheers niels
  15. midiphy Eurorack Expander Modules

    Hi Andy, nice to know, i will make something in the meantime . What exactly is the use of the usb power on the first board?