Yes, a schematic is available: http://www.ucapps.de/midibox_seq/mbseq_lite_blm.pdf
Best Regards, Thorsten.
Oh YES,
that’s a very useful and live-friendly approach,
seeing those awesome recording-features combined
with a immediate UI.
Maybe there’s room in that concept for havin the option
to half the parameterlayers and get 4 tracks instead of
two? But since data transfer with the big SEQ is possible,
one could use this as sketch pad for 1-2 complex tracks, which
can be copied on-the-fly to the “big” SEQ (that could serve the job of
being a multiple complex-tack player).
I can imagine this SEQlite as a really slick design together
with a little harmonic table-keyboard :w00t:
The step/live recording mode has been improved dramatically, the changes will be available in MBSEQ V4.048 as well!
looking forward to this! :frantics:
cheers!
Maybe there’s room in that concept for havin the option
to half the parameterlayers and get 4 tracks instead of
two?
In theory this is possible, but in practice I want to make this MBSEQV4L variant as simple as possible with a straightforward workflow and without too many options.
If you need more options, create an own firmware variant (requires programming skills) or build a MBSEQV4
But since data transfer with the big SEQ is possible,
one could use this as sketch pad for 1-2 complex tracks, which
can be copied on-the-fly to the “big” SEQ (that could serve the job of
being a multiple complex-tack player).
yes, this is possible.
And vice versa: you can playback all 16 tracks which have been prepared on a MBSEQV4 with the MBSEQV4L
I can imagine this SEQlite as a really slick design together
with a little harmonic table-keyboard :w00t:
yes, why not cannibalizing a cheap MIDI keyboard and building MBSEQV4L into the case? 
Best Regards, Thorsten.
"yes, why not cannibalizing a cheap MIDI keyboard and building MBSEQV4L into the case? "
the yamaha pss are cheap and very good ones , the same as the dx100 .
http://pss270.republika.pl/PSS680_5.jpg :frantics:
the yamaha pss are cheap and very good ones , the same as the dx100 .
A bit on the small side, eh?
A CME Z-KEY 49 seems to be nice for this purpose:
This isn’t a cheap solution (ca. 230 EUR @Thomann), but it has an aluminum case and plenty of space at the right side as if the designers considered the needs of the DIY folks 
Best Regards, Thorsten.
Very cool idea!
The PCB will be much smaller than the prototype.
@ Thorsten: I will be working on the pcb on sundy night. I’ve got my new Mac. And it works perfecly and its about time to continue that project …
Just a little teaser: PCB – work in progress:
This is the version I knocked up,the buttons are 6mm acrylic rod with a slot milled in them to take the led’s.
I am just waiting for some parts from reichelt at the the moment and experimenting with labeling.
cheers
Paul
This isn’t a cheap solution (ca. 230 EUR @Thomann), but it has an aluminum case and plenty of space at the right side as if the designers considered the needs of the DIY folks
There is a downside: You’d have to make your own power connection as it is fully USB powered. That could be tricky.
Another idea would be a Doepfer solution: Fatar keyboard (e.g. 49TP9) + MKE + cables.
The SEQ is USB-powered as well
Huh? :no:
Why? :wacko:
Huh? :no:
Why? :wacko:
More precise: There is a USB connector on the LPC17 Core board, as you can see on the first picture of this thread.
You can use this conection for power supply of the SEQ. If you don’t like that you can use a normal external power supply instead.
The LPC17 core offers you the possibility you want.
As you see on the prototype picture. We use USB as the power connection.
As you see on the prototype picture. We use USB as the power connection.
Not sure if you have considered power requirements here? If all 64 LEDs are on, and you use standard ones, you’ll end up at 64 x 20mA = 1.28A, which is way above the 500mA max. current draw specified for USB devices. And that does not include the core MCU or other ICs. Of course, it’s highly unrealistic that all LEDs will be on at the same time, plus you could use low-power LEDs. So, it’s not completely impossible to USB-power this thing, I guess. Just make sure you know what you’re doing here, i.e. do the math!
The prototype is USB powered and working.
There is a downside: You’d have to make your own power connection as it is fully USB powered. That could be tricky.
The preferred option is to power the core module via USB as well instead of using an external PSU.
You can even do this when the sequencer isn’t connected to a computer, just us an USB hub like this one: http://www.reichelt.de/USB-Hubs/MAXXTRO-MX-UAP/index.html?;ACTION=3;LA=2;ARTICLE=99781;GROUPID=4831;SID=11TVLbZ38AAAIAAG9MIgIec1e46ae3eb4fc2fe4e011f269170227
I like it because it has a power switch; all my core modules (including MBSEQ V4) are supplied by the PSU of this hub.
Another idea would be a Doepfer solution: Fatar keyboard (e.g. 49TP9) + MKE + cables.
Nice idea! Instead of using a MKE, the core module could scan the keys via DIN registers
Not sure if you have considered power requirements here? If all 64 LEDs are on, and you use standard ones, you’ll end up at 64 x 20mA = 1.28A, which is way above the 500mA max. current draw specified for USB devices. And that does not include the core MCU or other ICs. Of course, it’s highly unrealistic that all LEDs will be on at the same time, plus you could use low-power LEDs. So, it’s not completely impossible to USB-power this thing, I guess. Just make sure you know what you’re doing here, i.e. do the math!
Measuring results are 200 mA when 220 Ohm resistors are used for the LEDs!
With 100 Ohm resistors (as recommended in the schematic) I expect ca. 250 mA maximum.
We are using common LEDs, no low-power variants. But they are time multiplexed and not completely saturated ((3.3V-1.8V)/100 Ohm = 15 mA, 15 mA * 8 = 120 mA)
Best Regards, Thorsten.
The control surface PCB is up & running - no errors!
Great work, Christian!
And thanks to Nils for reviewing the design!
Under the hood:
sammichSID’s new friend:
Dimensions are matching:
Now it’s time to finish the case!
Best Regards, Thorsten.
Hi Thorsten,
As already asked in the gallery…are you thinking to a Ponoko case for it?
Regards
Antonio
Sweetness 
Yesyesyes! Looks very clean! Nice colour. I’m really looking forward to having my PCBs in my hands and to get that thing running.
Yes, there will be something like a ponoko-case. The Illustrator eps File is already existng. But I plan to built a very simplified case. with no sides, just the front- and the backside made of transparent acrylic material. I will post the file for download as soon as I have my pcbs to judge if everything s alright. If you want to do any modifications on the EPS-File, feel free to do so. I will only do what it thin is needed to fulfill my needs. It will look similar to a little tool I built a few years ago. I will post a picture of it later since I’m in a hurry now …