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Julian

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Posts posted by Julian

  1. midiboxSEQ V2 LCD trouble

    in Testing/Troubleshooting

    Posted

    hmmm strange...  the SEQ wasn't even connected to a psu since i used it the last time. how can an LCD just brake? O_o

    I allready reflowed all of the solder joints yesterday. till not working.

    i think i'll measure everything again tonight, and if i don't find any fault i'll have to get a new LCD :P

    so long,

    julian

  2. midiboxSEQ V2 LCD trouble

    in Testing/Troubleshooting

    Posted

    okay - just connected lcd 2 to the same enable line as lcd 1.

    LCD1 is working, LCD2 shows strange lines again.

    strange thing is i cant see ANY characters from the standard character set.

    just a bunch of horizontal lines that are randomnly connected by dots.

    when i switch menu pages the pattern change is deterministic.

    so it will always show the same line pattern for the same menu.

    if i turn some encoders i can see the pattern change. but it changes on a lot of places on the display on a per pixel basis

    could it be that my display controller is fried?

  3. midiboxSEQ V2 LCD trouble

    in Testing/Troubleshooting

    Posted

    its been a while since i powered up my mbSEQ the last time. but it was working good.

    now i started it again and suddendly the 2nd  2x40 lcd just shows some strange horizontal lines.

    the pattern of lines changes as i turn knobs or change menus.

    i checked all the data lines as well as the enable lines with my DMM and everithing seems correctly wired. no shorts etc...

    so now i'm a little clueless where to look next or what happened.

    best regards,

    julian

  9. CEM3378 + AOUT_LC Noize problem

    in Testing/Troubleshooting

    Posted

    it makes no difference if the sids audio out is connected to the filter...

    i build the filter and the aout in an extra box, with normal audio plugs, so i can disconnect the sid whenever i want, od connect other hardware.

    nothing is connected to the CEM but

    +12V internal PSU

    -5V internal PSU

    and a OpAmp at the output powered with +/-12V internal PSU

    ground

    the only connection between SID and AOUT is the +5V line

    (also tried it with ground connected to SID, makes no difference)

    AOUT is connected to

    +/- 12V internal PSU

    GND

    I can make a quick drawing if it helps.

    julian

  10. CEM3378 + AOUT_LC Noize problem

    in Testing/Troubleshooting

    Posted

    the jumpers are connected. I can also controll my modular system filter now without any problems or noise.

    also the CEM is fully controllable via the midibox. so the CVs are working, but in combinmation with the CEM i've got the noise

    but even if the 2 CV outputs of the AOUT_LC module are not connected to the CEM, I hear the noise as soon as i connect the sid to the AOUT.

    Aout and CEM share ground and +/-12V.

    the noise appears as soon as i connect the +5V  coming from the SID. havent put the digital lines on ground yet, but disconnected them all and just connected the 5V from the sid. (i will try putting them on ground now)

    so long,

    julian

  13. CEM3378 + AOUT_LC Noize problem

    in Testing/Troubleshooting

    Posted

    it's coming from the power.

    i removed the control signals coming frome the core.

    the noiz also starts when the aout isn't connected to the sid and i just connect the ground from the sids audio out to the ground of the audio in from the cem (but in this case only very silent).

    no noize if i connect the sid directly to the amp

    best,

    julian

  14. CEM3378 + AOUT_LC Noize problem

    in Testing/Troubleshooting

    Posted

    yesterday i finished my CEM and my AOUT_LC module.

    so far everything is working fine, i can control the CEM with my MB and the filter works.

    but ii've got a noise problem.

    when i controll the filter with a normal CV pot, there is no noize at all,

    but when i connect the AOUT to the midibox sid, i get some high frequency noize like this :(

    apparently the noise starts when i connect the gnd and or the 5V power line from the sid to the AOUT.

    the silence in the middle of the audio file is when i disconnect the midibox from the AOUT_LC.

    the AOUT_LC is powered by the midibox (+5V )

    and an internal PSU for the +/-12V

    so long,

    julian

  16. AOUT_LC PSU problem.

    in Testing/Troubleshooting

    Posted

    the transformer is getting hot with nothing connected to the PSU...

    so there is no consumer who could pull more than 400mA...

    if i don't connect the transformer to the PSU PCB it's not getting warm and delivers about 18V AC as it should.

    the picture was made with a software called 'lochmaster'

    a breadboard layout software.

    so long,

    julian

  17. AOUT_LC PSU problem.

    in Testing/Troubleshooting

    Posted

    hi,

    I've tried to build TKs PSU

    http://ucapps.de/mbhp/mbhp_opl3_psu.pdf

    but encountered a little problem.

    The Output voltage is ok, i get my +12V and -12V from the 7812 and 7912

    as well as +/- 5V cause i modified the layout a little bit.

    But the transformator is getting real hot.

    heres my design.

    http://web7.webfeeling-server.net/PSU.gif

    I use a 2x15V AC 12VA trafo.

    so thats 2 times 400mA... should be enough

    since the PSU has a low parts count and i double and tripple checked all connections I don't think its a connection problem or soldering error.

    do i just need a bigger trafo or what could be the cause that it becomes so hot?

    best,

    julian

  19. CEM3378 + SID Idea

    in Design Concepts

    Posted

    finally my holliday started, so its soldering time again.

    next project is the AOUT_LC and my CEM VCF.

    I had a nice idea, to build a Box like this:

    cem-unit.jpg

    So there are

    2 Audio In

    2 CV In          for controlling the CEM with other analog gear

    2 CV Out        to controll other analog gear with the midibox

    1 Audio Out

    further

    2 Depth knobs      controlling the depth of the midibox and external CV

    2 Filter Knobs        controlling the CEM manually

    1 Master Vol

    1 Switch              to select between MIDIBOX or external CV

    but since im quite a noob in designing my own circuits maybe someone can have a look on this layout I made, if it'll work.

    I tried to limit the CV voltage for the CEM to 5V using a ZENER diode. I hope in this way the ZENER will cut off any voltage above 5V?!

    (for example when the manual CutOff pot delivers already 5V and the AOUT delivers also some Volts) don't know if i made that right.

    further i'm not sure about the CV out (red box) is it the right way to go to buffer the output with an OpAmp?

    cem.jpg

    I know it's a flaky design, but it's like i said... me <- n00b ;D

    so long, Julian

  22. SID V1.7a BUG

    in MIDIbox SID

    Posted

    I noticed this bug quite a while ago... but never had the muse to post it ;) *G*

    I remember there was something else i had trouble with, but can't remember what is was...

    but holliday starts next week and i'm gonna do loats of music then!

    so long,

    julian

  23. SID V1.7a BUG

    in MIDIbox SID

    Posted

    hello...

    after working for quite a while I found another bug in the midibox.

    The Delay function for the OSCs isn't working anymore. (at least at my machine)

    when i use a simple 'New Patch' and want to ad delay on an OSC, it just don't play at all anymore.

    If a note is played and i move the encoder, the OSC doesnt respond to NOTE OFF signals -> infinite tone

    on complex patterns its even worse. there it seems like using the delay encoder generates some kind of random patch so just crazy noize is coming out of the sid...

    anybody else can confirm this behaviour?

    further I'm not quite happy with the speed of the RANDOM LFO waveform.

    It's much too fast... beyond a LFO SPEED of 10 or something its more like a noise modulation.

    no nice, slow sample and hold like  modulations are possible.

    besides that a great machine! i love it!

    Julian

  24. Monome Liveset from last saturday...

    in Songs & Sounds

    Posted

    hello :)

    theres a new liveset available on my page. (music section)

    It's from the 'unter dem pflaster der strand' party last saturday in Giessen, were i played.

    the used gear was:

    midibox sid

    a midi keyboard (for the SID)

    a laptop with ableton live (and no midi :((( so i couldn't use my midi controller)

    a toy guitar

    dj battle mixer

    hope you enjoy it...

    so long,

    julian

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