Karlchen

I found the reason in the meantime: It was a short caused by the screws with which I mounted the board to the frontplate. I looked for this in the first round, but obviously not thoroughly enough...

I finally managed to put my MidiCV-interface components into a case, but unfortunately the buttons don't work anymore now. They have been fully functional before >:( So far, I haven't figured out the reason. I guess, something is wrong with the communication of the DINX1 and the CORE module. I have taken the modules out of the case again and made some measurements. This is what I have found out: - Pressing the buttons on the DINX1 pulls the inputs from 5V to 0V. - There is a clock signal at the DINX1. - The LD-Line of the DINX1's shift register is constantly 5V, no matter if a button is pressed. - The serial output of the DINX1 is a rectangular signal, which loses amplitude when one of the 4 buttons is pressed. Can anybody tell my, if that sounds correct so far? Seems like I'm lacking some basic knowledge here...

This topic is quite old, but I had the same problem only yesterday. I used this schematic to build the PSU, which I downloaded from the website a while ago: It proposes the use of TWO rectifiers. The result was a humming transformator which nearly catched fire. When I followed the link to this schematic on the website today, the proposed PSU used only ONE rectifier, so I changed my board to that. Now the PSU seems to work fine. Is it possible, that the originally published schematic was impossible to work properly? Regards, Leonhard

Problem solved !!! :) Guess what: it was the power supply. Seems like 7,5V were not sufficient. I used 9V and now things look good (as far as I can see). Thanks for your help. Cheers, Leonhard

Here's what it looks like in my MIOS:

Hello Michael. These messages keep running down my screen. So I assume the core is sending SOMETHING permanently. The order of messages seems to be random. This evenig I wil try to post a sample screenshot of the output. >Do have something else running that could be sending a clock? Well, there is nothing else attached to my midi interface than the core (the interface is an Edirol UA-25). Is the proper output depending on an INPUT from mios studio into the core? If so, might the optocoupler cause the trouble? I had to remove it several times from the socket, because it didn't want to fit in there properly... Regards, Leonhard

By the way: I already checked: - voltage levels on the board - the cabling on the midi-connections - 10 MHz oscillator

Hi there. Since I just started to do some DIY projects based on Midibox, so this is my first post. And things don't seem to start extraordinarily well :( I have assembled my Core-module and connected it to mios studio. Instead of seeing sysex-messages in the monitor window, all I can see messages like [F8] Timing clock [FC] Stop [FF] System Reset running down my screen. Can I conclude that the bootloader was not flashed properly? I ordered a preprogrammed PIC from Mike's. Any help is highly appreciated...