Jump to content

sonicwarrior

Members
 View Profile  See their activity

  • Posts

    280

  • Joined

  • Last visited

  • Days Won

    1

 Content Type 

Posts posted by sonicwarrior

  2. Drum sequencer + modules

    in MIDIbox SEQ

    Posted · Edited by sonicwarrior

    I'm currently thinking that it would be nice to have the drum sequencer from the MB808

    plus a bus board to support drum modules.

    It could e.g. be Eurorack compatible which would have the following benefits:

    - there are already many Eurorack modules from Analogue Solutions and MFB which could be used

    - it is an existing standard (+/- 12V, +5V, CV/Gate on the bus)

    The standard could be modified a bit so that the CV and Gate bus are used for trigger and CV signals for the

    specific modules although currently no drum module supports that. It would mean something like a pre-patching.

    In this case the PCB has to include a bus board which carries the different triggers/CVs to the connectors.

    The sequencer would be at the bottom, the modules in the middle and trigger outputs at the top for those modules

    without Gate access from the bus. The housing would be then be a desktop case. Maybe with optional rack ears.

    Is someone interested in something like this? My main problem is that I'm not able to design such a desktop case.

  6. CANCELED: FPE MBseq panels

    in Bulk Orders

    Posted

    What's up with the backpanel?

    http://midibox.org/forums/topic/14547-midibox-seq-aluminium-desktop-case/page__view__findpost__p__129462

    And I think in quantities of 20+ silkscreen panels would be cheaper than engraved ones and also look much better.

    There is an open ended waitlist for the PCB, here is the thread: and the bulk order page: http://www.midibox.org/dokuwiki/wilba_mb_seq_pcb_bulk_order

    So I guess the 'matching case' part is obsolete?

  9. contacting trevor page re 9090

    in Miscellaneous

    Posted

    Here is a list of what is missing (everything else is included):

    - Audio jacks for PCB mounting (Neutrik NMJ4HFD2 @ Mouser)

    - Power switch + jack + fuse + fuse holder

    - 4011U (unbuffered)

    - 6 x 80K6 1% 271-80.6K resistors

    - All E12 resistors (Every serious DIYer should have them anyway)

    Capacitors:

    - 1 x 0,33uF Electrolythic 647-UVZ1HR33MDH

    - 2 x 22pF Ceramic 147-75-220

    - 7 x 100pF Polysterene 23PS110

    - 3 x 220pF Polysterene 23PS122

    - 4 x 470pF Polysterene 23PS147

    Potentiometers (available from http://www.users.zetnet.co.uk/esr/ ):

    470R Linear 1 947-147

    100K Log 1 946-410

    100K Linear 3 947-410

    1M Log 2 946-510

    10K Linear 10 947-310

    47K Linear 9 947-347

    470K Linear 4 947-447

    50K Dual Linear 1 949-350

    - LEDs (3 in total, I can provide 3 orange 3 mm ones from Osram but I guess everyone likes different LEDs)

    - 3 x 28 pin IC sockets (for the EPROMs) -> According to my list I should have them but I can't find them :(

    - Ribbon cable (AWG24 or 26) & braid

    - Case

    - Knobs for the pots

    I don't know what I can ask for this. I would say: Make me an offer.

  11. contacting trevor page re 9090

    in Miscellaneous

    Posted

    i want to buy a set of 9090 boards, pics and proms.

    I want to sell my half-kit. If you are interested I can list the contents when I'm at home.

    This would save you a lot of time as I've already collected the hard-to-get parts.

    Unfortunately I'm getting less and less time to do-it-myself.

  12. Getting the Midibox CV to work with Yamaha CS-series

    in Testing/Troubleshooting

    Posted

    Hi,

    in his build report of the all-in-one Midibox CV PCB rvlt reported a problem when using Yamaha CS-series mono synthesizers (CS-40 and below).

    I'm opening this as a new thread because else the posting may get lost without any notice:

    the only synths I couldn't get to work with mbcv were two yamahas (CS-5 and CS-40m). They have a "kind of" Hz/V behavior (CV doubles with every octave), but control voltage starts real low (C1 = 250mV, C2 = 500mV, C3 = 1V ..), whereas Korg synths start at C1=1V, C2=2V, C3=4V ...

    I don't know, maybe the resolution of max525 is too low in that range? maybe someone could enlighten me..

    cheers,

    rvlt.

    It does interest me, too, as I own a Yamaha CS-30 (but I haven't built my Midibox CV yet).

    According to sequencer.de the cv/gate data is:

    CV in/out: 0,0835 V to 4 V (exponential)

    Trigger in: Note off 15 V to 3 V / Note on 0 V to -10 V

    Trigger out: Note off 3 V / Note on -7 V

    So Gate Polarity should be set to negative and Output Curve is Hz/V.

    As far as I understand the documentation the Hz/V curve has to be calibrated.

    Or is it better to use the Oct/V output and a converter like this one:

    http://home.swipnet.se/cfmd/synths/schematics/oct2hz.pdf

    ?

    Almost two years ago I designed a PCB for this converter including the simple V-Trig to S-Trig converter

    from the Doepfer homepage (see attachment).

    So if it is really better to use such a converter and if there is enough interest here I will make

    a PCB run of these (and previously test it as it as it currently untested). Q1/Q2 can alternatively be LM394 or SSM2210 which

    are cheaper than the MAT02.

    5428_Magnus-Oct-Hz-Converter-pre08_gifaa

    5428_Magnus-Oct-Hz-Converter-pre08_gifaa

  17. MIDIbox CV PCB (CORE+AOUT+DINX1+Bankstick) + 2 x MAX525

    in Bulk Orders

    Posted

    Yeh, like ucapps or probably on the wiki. But forum attachments is good too :D

    Everybody can make a wiki page for this project I guess. I just did the group buy to make sure the project happens. The PCB design came from suital and everyone knows that the schematics, etc. came from Torsten Klose so it is already a group effort.

    @SHX8:

    Don't remember that one but as I mentioned: I didn't design the PCB.

  22. MIDIbox CV PCB (CORE+AOUT+DINX1+Bankstick) + 2 x MAX525

    in Bulk Orders

    Posted

    Btw.: The MAX525 arrived at the end of last week and I emailed every participant.

    I've sent the first sets on monday.

    3 sets (PCB, PIC, 2x MAX525) are still available because of jump-offs. If someone is interested:

    Please PM me with your email address.

    I had to order 108 chips because of a bulk quantity of 18 (108 = 6 packs).

    That means 8 MAX525 chips are available separately of which 2 are already gone.

    So 6 MAX525 are left if someone is interested in them.

    Btw.: Would be cool if we could bundle our forces for a frontpanel or case groupbuy.

    I myself am planing to use a MOTM- or DOTCOM-like Schaeffer frontpanel on one MIDIbox CV and a desktop or rack case for the others.

    I'm willing to do a second groupbuy for the PCBs if there is interest but I won't include the PICs and MAX525 this time.

    The latter caused most of the trouble + delay, it's easier to ship PCBs only and I don't have to handle that much money (remember: PayPal sucks).

    Edit: I forgot to mention that in this PCB you don't have to use a MAX6007B. The alternative is LM385-Z2,5 (Reichelt order number).

    See

    http://www.midibox.org/forum/index.php/topic,4026.msg26638.html#msg26638 (sorry, it's in german)

  24. MIDIbox CV PCB (CORE+AOUT+DINX1+Bankstick) + 2 x MAX525

    in Bulk Orders

    Posted

    It's still 2 months until I get the MAX525.  :(

    I'm so happy when this groupbuy is over. I will never do something like that again and a PCB groupbuy is the maximum I'm willing to do in the future: I can buy these here in Germany, there are easy to ship and I don't have to bother with lead times and currency conversion stress (like Euro/Dollar course).

    People who've done a few a groupbuys and are not pissed off are my heroes (e.g. Wilba or Doug Wellington). Maybe I just have lack of organisational talent ... or bad karma.  ;)

×
×
  • Create New...