TK.

The same link for you: see the "internal resistor" section under http://www.nzart.org.nz/nzart/examinat/amateur%20radio%20study%20guide/Course%20Files/Power%20Supplies/STUDY%20NOTES%20-%20POWER%20SUPPLIES.htm Best Regards, Thorsten.

Hi Justin, yes, your transformer works correctly. The voltage falls due to the internal resistance of the transformer - see also: http://www.nzart.org.nz/nzart/examinat/amateur%20radio%20study%20guide/Course%20Files/Power%20Supplies/STUDY%20NOTES%20-%20POWER%20SUPPLIES.htm The internal resistance is the reason why we are using a 7805 to regulate the supply voltage Vdd for the PIC. To your problem: if every tweak fails the only way to get it running is the use of another optocoupler. If I only had known that the CNY17 causes so much trouble, I had replaced it by a better optocoupler years before the first PCB layouts were released :-/ You could try the 6N138 circuit from the MBHP - if this works better with your synth, it's time for me to add a big warning to the MIDIbox Plus page Best Regards, Thorsten.

Hi Justin, yes, your transformer works correctly. The voltage falls due to the internal resistance of the transformer - see also: http://www.nzart.org.nz/nzart/examinat/amateur%20radio%20study%20guide/Course%20Files/Power%20Supplies/STUDY%20NOTES%20-%20POWER%20SUPPLIES.htm The internal resistance is the reason why we are using a 7805 to regulate the supply voltage Vdd for the PIC. To your problem: if every tweak fails the only way to get it running is the use of another optocoupler. If I only had known that the CNY17 causes so much trouble, I had replaced it by a better optocoupler years before the first PCB layouts were released :-/ You could try the 6N138 circuit from the MBHP - if this works better with your synth, it's time for me to add a big warning to the MIDIbox Plus page Best Regards, Thorsten.

The 25V are caps ok. The 2200uF/16V cap is also ok so long as you don't use an AC supply. perfect! Hmmm... the CNY17-II is the most crictial part of the MIDIbox Plus, some people noticed problems with the MIDI In and had to tweak the pull-up resistor. I've no experiences with the CNY17-I --- it could cause problems. However, if MIDI-In doesn't work, just switch to the 6N138 circuit which works much better. should work. The 8.2V zener can also be found in the original schematic; most people are using this diode w/o problems. Best Regards, Thorsten.

The 25V are caps ok. The 2200uF/16V cap is also ok so long as you don't use an AC supply. perfect! Hmmm... the CNY17-II is the most crictial part of the MIDIbox Plus, some people noticed problems with the MIDI In and had to tweak the pull-up resistor. I've no experiences with the CNY17-I --- it could cause problems. However, if MIDI-In doesn't work, just switch to the 6N138 circuit which works much better. should work. The 8.2V zener can also be found in the original schematic; most people are using this diode w/o problems. Best Regards, Thorsten.

After one day playing with a almost complete LC emulator I must say: I've found for what I'm looking for :D But still some effort is necessary to program an alternative mode which allows the use of the controller without help of a host application... LCD: yes, it's a "Displaytech 64240A" for 66 EUR - I love those Displaytech LCD's because of the high quality. :) But for people outside Germany I cannot recommend to buy the stuff at Reichelt due to the high shipping costs to foreign countries of about 35 EUR! Please post here if you know any alternative distributors for Displaytech products or KS0108 compatible displays Best Regards, Thorsten.

For everybody who is interested in making his own Logic/Mackie Control: here are some insights in the current development state. Yesterday I got the graphic LCD and started to write the PIC18F driver. I noticed that the performance is much better than expected, mostly the chip is in idle state, and the LCD can be served very fast due to the new instructions (i.E flash read is appr. 32 times, multiplications appr. 50 times faster!). So I'm assuming that beside of the display all encoders and buttons can also be handled by one PIC18F --- the MIDIbox NG design phase begins right now (ok, next year, because I'm not at home in the next days... ;-)) The next interesting notice I made was, that the resolution of the LCD (240x64) is good enough for this application. All characters are displayed in a 3x8 font. Not all chars are looking aesthetical (especially the small letters like "m" and "w"), but can be read without problems. Here some snapshots (sorry for the bad picture quality): The surface I plan to reallize looks different from the original design, because I'm planning to use it also with other applications (Reaktor): Maybe I will add some more buttons at the right upper edge... And finally here the current state of this surface - far from perfection, but everything is working well :) Best Regards, Thorsten.

For everybody who is interested in making his own Logic/Mackie Control: here are some insights in the current development state. Yesterday I got the graphic LCD and started to write the PIC18F driver. I noticed that the performance is much better than expected, mostly the chip is in idle state, and the LCD can be served very fast due to the new instructions (i.E flash read is appr. 32 times, multiplications appr. 50 times faster!). So I'm assuming that beside of the display all encoders and buttons can also be handled by one PIC18F --- the MIDIbox NG design phase begins right now (ok, next year, because I'm not at home in the next days... ;-)) The next interesting notice I made was, that the resolution of the LCD (240x64) is good enough for this application. All characters are displayed in a 3x8 font. Not all chars are looking aesthetical (especially the small letters like "m" and "w"), but can be read without problems. Here some snapshots (sorry for the bad picture quality): The surface I plan to reallize looks different from the original design, because I'm planning to use it also with other applications (Reaktor): Maybe I will add some more buttons at the right upper edge... And finally here the current state of this surface - far from perfection, but everything is working well :) Best Regards, Thorsten.

No - you got exactly the right ones :) Best Regards, Thorsten.

No - you got exactly the right ones :) Best Regards, Thorsten.

The MB16E not only supports encoders, but also 64 buttons, like the other firmwares. So, for the traktor control surface the combination of two core modules, one running with MB64, the other with MB16E, was the ideal solution. Concerning MIDIbox NG: please read the news section, where the details are listed! Yes, the MIDIbox NG firmware will allow to handle with encoders and pots in a single core application - everything will become easier and cheaper :) But I think that first of all you should explore the news section of this forum and my website, because the answers to your questions can already be found there. It's important that you understand the possibilities and the principle of the projects before you begin with the realization, this will help you to plan the ideal controller for your needs. Best Regards, Thorsten.

The MB16E not only supports encoders, but also 64 buttons, like the other firmwares. So, for the traktor control surface the combination of two core modules, one running with MB64, the other with MB16E, was the ideal solution. Concerning MIDIbox NG: please read the news section, where the details are listed! Yes, the MIDIbox NG firmware will allow to handle with encoders and pots in a single core application - everything will become easier and cheaper :) But I think that first of all you should explore the news section of this forum and my website, because the answers to your questions can already be found there. It's important that you understand the possibilities and the principle of the projects before you begin with the realization, this will help you to plan the ideal controller for your needs. Best Regards, Thorsten.

Did you buy linear or logarithmic pots/faders? (Part-Number?) Because based on your description it seems that these are the log ones and they are not accurate for the MIDIbox :-/ Best Regards, Thorsten.

Did you buy linear or logarithmic pots/faders? (Part-Number?) Because based on your description it seems that these are the log ones and they are not accurate for the MIDIbox :-/ Best Regards, Thorsten.

Do you notice a flickering of the pot values, or do you see unwanted MIDI events (i.E pitch bender, Aftertouch) although these events haven't been assigned to the pots/buttons. In both cases this could be related to the power supply. The core voltage should be about 5V, lower voltages can cause problems with the MIDI transfer (...and much higher voltages kill the chip!) Best Regards, Thorsten.

Do you notice a flickering of the pot values, or do you see unwanted MIDI events (i.E pitch bender, Aftertouch) although these events haven't been assigned to the pots/buttons. In both cases this could be related to the power supply. The core voltage should be about 5V, lower voltages can cause problems with the MIDI transfer (...and much higher voltages kill the chip!) Best Regards, Thorsten.

The knobs are great - I will order some (you've got mail :)) Best Regards, Thorsten.

The knobs are great - I will order some (you've got mail :)) Best Regards, Thorsten.

Hi Lo, do you mean that the faders are too fast? This can be regulated with the pot next to the LM317. Best Regards, Thorsten.

Hi Lo, do you mean that the faders are too fast? This can be regulated with the pot next to the LM317. Best Regards, Thorsten.

Here the schematic: Best Regards, Thorsten.

Here the schematic: Best Regards, Thorsten.

Thats really strange - in the meantime I tried the new release under Linux, Windows ME and Windows 2000 w/o problems. How do you start the editor? The suggested way: open the DOS-Shell, change to the jsynth directory and start the editor with java JSynthLib Or write a batch script (run.bat) and write this command into the file in order to start the editor via mouse Note that the old setup file is not compatible with the new one - the old could cause trouble; just delete it (del PatchEdit.config) Best Regards, Thorsten.

I don't know the reason for the fails, but I just have compiled the sources once more from scratch. Could you please try if it works better? http://www.midibox.org/midibox_sid/jsynth_017_with_mbsid_rel2b.zip Best Regards, Thorsten.

Hi Rogic, MB64 doesn't support encoders, I think that you are either searching for MIDIbox16E, or for the upcoming MIDIbox NG... The encoder connections to the DINX4 module can be found at the DIN page: http://www.ucapps.de/mbhp_din.html (-> mbhp_dinx4_16enc.pdf). They don't need a power supply. Best Regards, Thorsten.