strophlex

Use long M3 screws and cut the head off.

I put mine in a 1U rack case to fit all the ten midi connectors. I can post pictures if interested.

It depends on what you want to do with the board. I soldered mine too. It is a sequencer and will probobly never change job. I dont't think it is a big problem it you should change your mind anyway, just desolder them or cut them up and desolder them pin by pin and get new ones.

I want to try too... http://soundcloud.com/herr-ur/lmbs04

Does anybody have any comments to or experience of the NorthenLightFX PSU design? Is the voltage devider resistor a good way to limit the voltage over the 5V regulator or is there some diode based solutions that are more efficient?

Now I have read up and tried it out and understand how it works. The text in the manual is actually OK if you read it carefully and the link to the tutorial is there too but there is allot of information to absorb. I wrote this, it deviates from the example and it might be a bit too through but I think it would make me understand it faster... Notes are controlled in a special way: instead of specifying the actual note, you make a note selection and an octave transposition selection. The note is selected from the currently received choord and the octave transposition is relative to that note. Both selections are done for each individual step and are displayed in a special format concisting of note and octave transposition. The following example shows the notation: Let's assume the Chord C-3, E-3, G-3, B-3 is played on the external MIDI keyboard and that the pattern 1+0 --- 1-1 --- 1+1 --- 2+0 --- 3+0 --- 4+0 --- 2+0 3+1 2-1 4+2 is entered into the sequencer. At the first step the note C-3 (first note, no transpose) will be output. At step 3, C-2 (first note, -1 octave transpose). At step 5, C-4 (first note, +1 octave transpose). At step 7, E-3 (second note, no octave transpose). At step 9, G-3 (third note, no octave transpose). At step 11, B-3 (forth note, no octave transpose). At step 13, E-3 (second note, no octave transpose). At step 14, G-4 (third note, +1 octave transpose). At step 15, E-2 (second note, -1 octave transpose). At step 16, B-5 (forth note, +2 octave transpose).

mazatta: Sorry for hijacking the thread. I still propose the 25VA transformer if you are going to use it for all voltages, -12, +12 and +5V. It is more than you need like Nils says, but unless you are short on space I don't see a problem. Nils: I messured the current draw of the 5V rail of my MB6582 when it was idle. I was exactly 1A. I guess 2A should be more than enough for any situation. 10VA that is.

Did you configure for 9V / SID 6582? Everything except the 12V rail seems to be shorted to ground. Pick up that connectivity tester and make sure there is no connection between 9V, 5V and ground.

Sounds like a good exercise. Edit: Had a quick look and including SIDs, PICs, LCD, LEDs and shift regs. I sum up the max to allmost 30 W. The specs of the C64 PSU seems to be 40W. Most of the current is off course drawn by the 5V rail, so it might make sence to use a separate transformer for the 5V rail...

But if you want to use the transformer for 5V too according to http://www.midibox.org/dokuwiki/doku.php?id=northernlightx ? I plan to use this schematic for my MB6582 (allong with AOUT_NG and SSM2044s) too, how much juice do you think is necessary for that?

Great! I will read up and provide a description that makes more sense to me! :D

Did my STM32 homework. Waiting for STM32F105RD... Midibox became high tech frontline!

No, but I expect it to work like this: I input a chord from the keyboard, the seq sorts the notes and cycles through them in the order defined by the current arp step. Thus, to try this out: I set the track to arpegiator, set a few arp events in the editor and press and hols some (several) keys on the keyboard while the sequencer is running. I used IN1 too.

Try to meassure the voltage of the output of the wall wart (when not connected to the sammich) to make sure it outputs what you expect. Make sure the multimeter probes don't touch eachother. If your multimeter has connectivity tester, check that the dc rails 5V and 9V/12V are not connected to ground. If it doesn't you can use the resistance setting and messure the resistance between dc rails and ground. It should not be near zero ohms. That would be a first step.

"the Java editor", is that JSynthLib? I downloaded the snapshot @ http://www.midibox.org/jsynthlib/JSynthLib-Snapshot-2006-01-28.jar.zip but it crashes on startup in OS X. Might work better in Windows.

I don't get it to work... Which port did you use?

So, it will use a different microcontroller than the sequencer... Will the implementation involve slave PICs? How far off is this? Sorry for being a bit too curious...

I will build this for my FM too. Found these @ mouser. 553-VPT24-1040 - 25VA 553-VPT24-2080 - 50VA The instructions say 50VA, but I think 25VA should be enough. Not sure though. Anyway, these transformers can be used with either 115V or 230V outlets.

More questions: What is the "reset stacks" under the midi menus for? How is the probability implemented? It doesn't seem to work like expected. When I set 50% to a few steps i a drum sequence some steps always trigger anyway (in this case step 15). I guess the value set should be the actual probability. Anyway, what I have discovered so far of the sequencer is really great! Keep it up! EDIT: Same prob. thing poped up again on step 15. Set the prob. to 0% and it kept playing...

I don't manage to get the arpeggiator to work. I have tried with a midi keyboard. I set the appropriate midi channel and port in the midi->transposer and arp. menu. Have tried port: all too. And I have set the mode of the track to arpeggiator. T/A split is off (tried on too) and in midi->misc->midi monitor I see incoming midi on the right port. The keyboard works fine for transposing. I must have missed some setting. Also, how can i control arpeggiator via loopback? making a loopback track with chords sends only chords with root note unless i transpose them with the keyboard, right? Another one, there are several bus ports, what are they for.

Very interesting. I guess this is rather far off in the future. However, I guess an upgrade path from existing hardware similar to SeqV3->SeqV4 will be possible, so that I can build a single OPL3 FM and leave space for additional units in the case.

Would it be possible to build a multi core/opl3 MB-FM using a common contol surface using MBNet? I am thinking someting like MB6582 where you switch between the synth engines with a button. I am not sure if this is necessary, but when I listen to MB-FM examples I think I could use many channels and I guess it would be possible to make stereo patches too... As far as I undertand there is no CAN interface on the PIC452 (that is used for the MB-FM application), but if PIC4685s are used? Are there pin conflicts? Would the programming effort be great? Would this at all be possible? I know this question has been raised before, but I don't think it was throughly examined.

You have to upload the presets. They are in the presets/v2_vintage_bank.syx. Upload it with midi ox or mios studio 2(?).

De har bara tillverkats i två omgångar i förhandsbokade gruppbeställningar så för närvarande går de inte att beställa. Wilba skrev i så sent som för en vecka sedan: Så det är nog bara att ge sig till tåls och hålla ögonen på den tråden...