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  1. I was seeing an error on startup which read "SID 4 not available (CAN bus errors)", along with a flashing top row of LEDs and flashing left column.        I searched the forum and found this thread, which gave me some direction: Specifically this comment from Wilba:   So, I disconnected my LCD from the control surface and the flashing LED issue went away, so I must have been shorting the tactile switches behind the control surface. However, I'm still getting the same error whenever I try to access any SID module other than SID1... For reference, I can confirm that all of the D1_COREX diodes are in place, as well as R80. I've reflowed them to be sure the solder joints are good, but still no luck...     Perhaps I should replace the diode under Core1?  Other suggestions? Appreciate any insights.  
  2. Hello everyone, Have been in the process of building my midibox SID for years now, but never seem to be able to get around it. Always concerned that once its built, it could be better. So I've been looking and gathering information about the best projects for midibox SID Models, different SID configurations, different front panel options, and most important, different power supplys. Currently trying to figure out the best way to supply my SID circuit, and this seems to be the best 2 options ou there: C64 transformer suplying a 9V linear regulator and a 5 Volt line directly from transformer to the SID Vcc pin Using a 12V-15V power supply to supply both a 9V linear regulator, and a 5V buck converter in parallel. Both of this options leave me a bit weary. Connecting the SID Vcc directly to the transformer would probably prevent me from having a good night sleep ever again, but also I'm not sure how this buck converter works out when bad stuff happens. I imagine that if the unlikely event of the Mosfet on the buck converter would blow up, it could act as a short circuit and expose the Vcc rail to whatever input voltage is receiving(Please correct me if I'm wrong). I've seen lots of Posts in the forum regarding this topic, and was wondering if I could get an engineer's input on the following circuit(no pun intended).   A Google search for 'discrete over voltage protection circuit' will reveal this link as one of its first results: The article from Maxim describes how the circuit works in great detail, but here's an overview: This simple protection circuit is composed by: - 3 resistors - 2 PNP transitors - 1 Diode - 1 Zener   The circuit provides a power supply line with adjustable over-voltage protection, meaning that once the voltage at the input exceeds a certain level, the circuit will shut down its output power. The maximum current can also be programmed to certain extent by carefully selecting the transistors bias resistors. A simple reversed bias diode is used as a weak moderate protection against power line reverse voltages. I've simulated the circuit and carefully selected the components so that they meet the 8580 Chip Power limits specifications. I actually took this info from the 6581 datasheet, so not really sure if the same values apply, but good enough to use as a case study. 6581 Vdd pin = 9V  25-40 mA 6581 Vcc pin = 5V  70-100 mA I'm using 2 separate circuits in my simulation, one as a protection for the SID Vdd pin, the other for the Vcc pin. Here is the outcome of the following tests:   Test 1: Ideal conditions - sim001_stable.jpg I feed the expected voltages(in range) into the circuits, using some moderate loads (around 200 ohm) to pull some current  and everything works as expected. The pass transistor Q2 passes the amount of current required by the 200 ohm load, but also imposes a small voltage drop on the line so this should be taken into consideration.   Test 2: Over current protection in action - sim002_heavy_load.jpg I started to simulate faulty conditions. First I decreased the resistance of the loads progressively until I reached their smallest possible value (around 1 ohm), so that maximum current is pulled from the pass transistors Q2. After the load resistances goes lower then a certain value, the current through the pass transistor Q2 is kept the same, and does not go higher as it is limited by resistors R2, R3 and transitor Q1 which controls the current flow in Q2.   Test 3: Extreme limits near tip off - sim003_heavy_load_over_volt.jpg I started raising both Voltages at the circuit inputs until near their tip off points.The load resistance level was kept the same, so that maximum current flow is expected. In this scenario we can see the maximum current that the circuit will allow to pass, just before its tip off point. For Vcc, when there's a slight over voltage condition, the maximum allowed current will be around 20 mA more then its rated max limit of 100mA. For Vdd, when there's a slight over voltage condition, the maximum allowed current will be arounf 10 mA more then its rated max limit of 40mA. This upper limits are carefully set as to provide some wiggle room for the IC current requirements.   Test 4: Over voltage protection in Action - sim004_over_volt_shutdown.jpg I continued to raise the input voltages above their tip off points (6.2V for Vcc and 11V for Vdd). Once the input voltage exceeds the tip off voltage, the circuit cuts off the pass transistors shutting down the power lines to the IC pins. The transistor is kept off until the input voltage level is set lower then its tip off point. Although I seem confident about this circuit's performance, I'm not an engineer, so it would be really great if someone with more expertize could give me their input on how great(or great disaster) would this circuits be as a power protection for the SID power pins. Not so sure this circuit would provide a nice output impedance for the SID chip to work as naturally as possible, without any restraints. What do you guys think?   Also, does anyone out there knows the Absolute Maximum Ratings for the 8580 chip? Kind regards, analog_mo      
  3. [SOLD] MB-6582

    Hey Guys, Up for sale is a MB6582 with 8x 8580R5 SIDs, build with red LEDs and Red background LCD, Transparent Waldorf Knobs, Display Window, and Original C64PSU. the box is Nr. 143 on Wilbas official list of MB-6582 builders: The box is in Austria and the desired price is 850€ without shipping. You can find more Pics on my Flickr-page Best regards! Philipp
  4. I just discovered yesterday that a new Commodore 64 power supply exists, and is shipped by a company in Poland. It has the same 7-pin DIN plug as the original "brick" power supply with a 5VDC rail and  9VAC rail. Should be a good investment for people who fear that a 30 year old C64 brick might fail and damage their SID chips in their MIDIbox SID / MB-6582. Also don't forget Altitudes idea of using high efficiency RECOM switching regulators in the PSU circuit of the MB-6582 / MIDIbox SID, which allows you to use a common single rail DC power supply. jaytee wrote a lovely guide on this here:    
  5. In need of SID 6582 chips

    Hi there folks, New member here, can someone help me find 4 or 8 6582 chips? Thanks in advance.    
  6. My MIDIBOX SID build is using the MB-6582 main board and a custom control surface. I'm building it inside a VIC-20 case and the control surface is built on a modified keyboard using the keys as buttons. The encoders I got push up through the holes in the keyboard tray. Due to a lack of room I'm not including the matrix. LEDs are placed around the keyboard area and my attached layout shows where I'm thinking of putting them. I went through a bunch of different layout ideas and ultimately went with whats attached. I tried to keep knobs near the edges so i can put labels right next to them. My goal is to have the chosen keycaps represent the button functions, but I'm limited by the fact that I only have a single keycap set. I'm using the old PET style keys so its hard to get extras without paying an arm and leg. Hence I'd love to have two CTRL keys, but I only have one so I'm using A for Osc knobs ENV/MISC/ASSIGN selector. While I think I tried to place everything as optimally as possible, I lack the experience of using these devices so I thought I'd see if any of you seasoned MIDIBOXers might have any thoughts, suggestions, or see any obvious pitfalls I might be missing with what I choose to do. For anyone interested, I'm documenting my progress on a blog on my website: Thanks!
  7. Strange button behaviour

    Hi all, My beloved MB-6582 has developed a problem with the rightmost menu button, i.e., the one used to select the SAV page. It used to work, but now when I press it, it selects either the ENV or MOD page instead, irrespective of what page is actually shown above it. This means I’m no longer able to save any patches.  Does anyone know what the cause might be? Hardware or software? I’m not sure how to begin diagnosing it.  Thanks in advance for any help. 
  8. Zero Circuit

    Hola, Could spare two hours for the first jam in 2018 :), this time with MBLoopA, MBProgramma and the MB-6582 :) Me had some troubles with the Programma, as it was suddenly inoperational from one day to the next, fortunately only the SD card was damaged, no file system could be recognized. I just formatted it, restored the files and all is well again - the prototype still works :). In this track, the Programma is used to control the bassline synth, the Ensoniq ESQ-M (the spiritual successor of the C64 SID, also from Bob Yannes). Some wild osc-octave switching with quite high filter resonance can be heard later on in the track :-). No MBSeq used here, only the MBLoopA - thanks to Andy, we hope for the public availability of LoopA boards and essential/hard-to-source parts somewhen in springtime! :) Thanks for watching and listening and have a great time with your synths whenever you have the chance to do so! Many greets, Peter
  9. [WTB] MB-6582 panel set

    As the title says, If anyone has a spare set of front and rear panels they want to sell then I'd be interested in buying them. I'm not too concerned about colour or condition, only that the price including shipping to New Zealand beats what I'd need to pay to fabricate a new set. 
  10. Hello guys! Finally I reached my hands to try to fix jumping behavior of non-detented encoders on my MB-6582. Wilba says that only one (menu) encoder has to be left detented in his CS construction guide. I'm curious then why ALL 15 encoders are assigned as MIOS_ENC_MODE_DETENTED3 in setup_mb6582.asm by default ? Were MIOS_ENC_MODE_DETENTED* modes designed only for detented encoders? As for my non-detented ALPHA encoders MIOS_ENC_MODE_NON_DETENTED works best. However, not perfect (it's more noticeable on large range values like cutoff): even if I move encoder very slowly, sometimes value gets rapidly advanced by ~10 (jumps a little forward). And sometimes even it jump backward, but not so often at least (like MIOS_ENC_MODE_DETENTED3 mode does). By "forward" I mean sporadic acceleration, and by "backward" I mean direction opposite to direction in which I turn the knob. So, I've checked all the modes and MIOS_ENC_MODE_NON_DETENTED seems to be the most close to perfect. I've tried also another encoder. It is almost like my ALPHA, however without "ALPHA" logo on it's bottom and contacts are white instead of yellow. Metal tongue inside is also white, not yellow. I've made it non-detented also. I must admit, this encoder does not jump backwards in MIOS_ENC_MODE_DETENTED3 mode. Almost :-) It jumped to ~30 (of 256 range) back only once. I slowly moved it back and forth during 10 minutes - the feel is very symmetrical and uniform compared to original ALPHA, however, not as smooth and still a little "clicky" (may be I didn't remove detent perfectly). So, if I want to set a precise value - it feels a little rough and non linear compared to original ALPHA, but in large scope (when I turn encoder faster) - it works in polite and predicted manner. Please, let me know what do you think
  11. Dub Techno Jam

    I don't think I've ever posted some sounds in this forum so with a little inspiration from Hawkeye its time to start! Heres a short dub techno jam with MB-6582 on chord duty, going into a Zoom MS-100BT pedal, Roland JU-06 provides the background sequence and a Yamaha RS7000 provides drums.    
  12. MB-6582 BOM questions

    Making a big Mouser order for the MB-6582 parts I couldn't source from Tayda. I have a few questions about the BOM. - Is there anywhere to source the necessary rocker-style power switches? All I can find is a couple references to Wilba selling them from a larger batch. I used the photo on the old group buy wiki page to figure out what part it was, but can't find any place to purchase it. Is there another suitable part? Does anyone on the board have these? Should I just go with some other (probably panel-mount) switch and adjust the rear panel design as needed? I think I'm going to do that with the power jack anyway, since I'm gonna run it from a single 12V supply and want to use a standard jack instead of the 7-pin DIN jack. EDIT: I seem to have found a switch that matches. First of all, it looks like the switch that Wilba was supplying is the R8011L from Salem (caveat, this is my best guess based on the image on the group buy wiki page). As far as I can tell, this switch (E201J1AV2BE2 from C&K) seems to be a close match. Only difference I can find is that the rocker sticks out an extra fraction of a millimeter. Not cheap, unfortunately. I'll probably buy one and give it a shot unless anyone points out that I've missed some crucial detail that makes it incompatible. I'll report back whether it works or not. Hopefully this is a help to anyone else looking for this rare part. Actually, upon closer inspection, I think the switch that Wilba supplied was the R8017L from Salecom. Ever so slightly different. C&K lists a matching part in their datasheet (E201J1V5BE2 ), but it doesn't seem to be for sale anywhere. Back to the drawing board. - The feedback pots aren't on the BOM. I think they're supposed to be 500k dual-gang pots, right? Log or linear taper (I think log, right)? Can anyone suggest a matching pot/knob combo? I know that the pots probably aren't hard to find, but I feel totally inept at match knobs to pot shafts.  - Speaking of the feedback pots, how useful do folks find them? I'm considering leaving them out entirely. Despite seeing successful installs from other folks, I worry about noise coming in on the audio-in pin, and about eventually blowing the SID filters, which I've heard the audio-in can do. I'm using 8580/6582 SIDs, if it makes any difference. - There's nothing in the BOM about securing the base PCB to the Pac-Tec case. Are the screws included with the PT-10 sufficient or are those only to close the case? I can't really tell from the PT-10 data sheet. - Can anyone give me a quick primer on crimp pins/female connectors for the headers on the base PCB? I promise I've googled this, but I must not be searching for the right things. It seems like a lot of DIY stuff assumes knowledge on what pieces and parts one needs to buy to assemble female connectors for headers, but this will be my first time not just soldering wires directly to the board in lieu of headers altogether (trying to do this right!). - Speaking of connectors, can anyone offer Mouser part numbers for the correct LCD connector. I have a better idea how to assemble this piece at least, thanks to the guide to MIDIbox display cables, but I just want to be sure I'm getting the right part; again, first time working with these types of connectors. -Any other parts that aren't on the BOM that I should pick up? Even just basic stuff that most folks would already have in their workshop. Only things I've come up with are shunts and a few machine-pin female headers (for SID capacitors and LED resistors).   Sorry, I know this is a ton of questions about stuff that most folks here (and elsewhere in the DIY world) take for granted as simple matters. Just looking for a little guidance before I drop a bunch of money on parts. Better to ask these questions now than after parts arrive and I get the wrong stuff.   As a post-script, let me just say that I do not recommend buying IC sockets from Tayda, or at the very least, not the 28-pin wide sockets (i.e. SID sockets). On two separate sockets, a pin came loose while placing it into the PCB and the wipers slid upward. Really poor quality.
  13. MB-6582 CS PCB

    Hey guys, I know this is a long shot but just wondering if anyone has a MB-6582 control surface PCB that they want to get rid of? I have the MB-6582 base which I've just completed and I've been working on a control surface but the CS PCB makes it all so much tidier! :) Cheers! Steve
  14. MB-6582 header length

    Hey guys, apologies for the rookie question, but is there a particular length the headers should be?
  15. MidiBox SID / MB6582 mixer

    Hi there, I don't know if something like this has been proposed already but if it hasn't, here's a simple two-transistor virtual-earth summing amplifier for the mixer output of the MB6582. It's suboptimal in many ways because I wanted to keep it simple and cheap (and try to use as much as possible existing components value from the main project, e.g. BC547, 10uF caps, etc). I wanted to make it so that it did not require any modification of the existing hardware to work (including running from available voltages), and I also wanted to keep its PCB footprint small in case someone wants to add it to the MB6582 PCB. I think the schematics is pretty self-explanatory, the general idea here, as with all virtual-earth summing systems, is to basically have 0Vp-p at the summing point to reduce crosstalk between channels. The setup is a two-stage tansimpedance amplifier: T1 turns current at its input into voltage and is buffered from the output via the voltage-follower T2. The bootstrap capacitor C3 improves linearity and reduces bus residual. The existing mix resistors are pictured as RM1-RM8. This circuit has a lot of shortcomings, but since we're not exactly going HiFi here, it should still deliver much better results than the original passive summing system which had some severe crosstalk. It should also be fairly easy to add a volume control stage to that mixer output. Note: this is an inverting stage: the output phase is reversed. I wasn't entirely sure where to set the mark for the gain: the circuit will hard clip at around 4.8Vp-p input, 10Vp-p output. I've done some very basic (read: almost none ) testing with my MB6582 and it seems to do the job. Comments welcome.   By the way, speaking of comments, I'd have two suggestions for the MB6582 PCB: Please add thermal relief on the ground plane: soldering the ground pins at safe temperatures, even with a 80W iron, is really not easy without them. While ENIG looks beautiful, it's really not DIY friendly either: HASL is much better in that regard: it has excellent component wetting. ENIG only has the upper hand if you have a lot of SMDs and need perfect surface level, which is not the case here. My 2c ! Cheers, T. mixer summing.pdf
  16. This is the power supply in DE:GENERATOR Link german blog: Link english blog:
  17. Hi there, just finishing up my first MB-6582, powered with 8*6582 chips. Instead of usign the big C64 supply, i've choosen to power it trough a regulated external power supply. it deliver regulated 9V DC ,5V DC and ground at  around 1500 mA. Thought it would be enough for 1 synth so,before connecting 9v,5v and ground directly to J4 (no switch between power and J4), i was thinking about using the great power switch supplied with the MB-6582 kits from smashTV. My question is : Is there any thing i have to respect to use this power switch or could i solder my wires directly on it? could provide photos if this is not clear. My best regards, JK 
  18. MB6582 single power supply

    Hello all,   I am building my MB6582 and I would like to use a single regulated 12VDC wall adapter. I already read different posts related to the MB6582 power supply options, but I am still in doubt...   Question: can I directly use the 12VDC rail for the SIDs (6582) and a switching regulator to derive the +5V rail?   I mean: any problem in terms of noise in referring both the rails to the same GND instead of superimposing the 9V to the 5V one?   Thank you!   Walter  
  19. Seq V4 power supply

    Hi, I power the Seq v4 with USB , Fine , stable (since a month) i want to permute for a permanent dedicated PSU than USB in the seq case  (BLM extension ready) so i've bought a meanwell 5V 3A at reichelt . Meanwell PSU this switching PSU made the Control Surface crash! ( i suspect interaction between supply switching frequency and the frequency of the CS matrix also ripple/noise) i could build filters to sleek the PSU but the config is a bit special. (filter have to be well designed for a certain current, BLM is not constent current, and if the CS crash the BLM will do too! don't like this sensible way) so i thinking use classic design PSU with transformer and a linear LT1085-5 regulator (not done yet) i never used this regulator but i will test. Is someone have experience , suggestion or tips with higher current than 7805 regulator. (perhaps another regulator familly than LT1085) Thanks Nico  
  20. RGB LCD on a MB - 6582

    Bad news turns out that my LCD screen letters sticking was a sign it was on its way out because now it's had it, backlight seems ok, but letters are dead. So I'm happy to buy a nice high quality LCD display and may as well turn this into an opportunity to learn something about the workings of the MB-6582.   So I now need a replacement, is there anything stopping me using an RGB LCD like this What extra electronics would I require in order to put a pot (or switch) in the box some place that lets me change the LCD colour assuming that is possible? (if I wire this up as 'normal' will it work on the MB-6582 as a red display?)   Any advice or assistance would be greatly appreciated, I am very much an electronics novice but not completely clueless and very happy to learn.   Much Thanks,   SF            
  21. Hi all!   Thought you might like to see my synth! It uses a MB-6582 as the core, running through an SSM2044 filter module, controlled by an Arduino..   I only just realised that the Midibox SID has an analog CV out, but it was too late! I ended up coding an Arduino with a seperate envelope generator and CV out, with two modes - one is a dirty PWM output that mashes up the CV through some filthy capacitor filtering - this is what I'm using in the video clip.. I've since added a seperate DAC chip output for a cleaner CV, but since I liked the sound the PWM filter makes, I kept it, and added a switch to toggle between both modes.   I also cannibalized the C64 power supply, so now the whole unit all runs from a kettle lead on the back of the box..   There's some big faders on the left controlling the ADSR, which makes hands-on control of the filter a piece of cake, which is crucial when you're in the midst of a funk jam! There's a MIDI controller built into the box, and the Mod Wheel also controls the filter..   Excuse the MDF box and marker pen labels - presentation was never my speciality! I think it fits the disgustingly mighty sound this monster monosynth creates!   Here's a clip from the reCyclotron 64's first outing last week at my Groove Night.. Enjoy the filthy sound of four SID chips running through an SSM2044, into a Roland Jazz Chorus, with some extremely funky British musicians!   And big up TK and Wilba for some awesome electronics x     Carl
  22. Selling my MB-6582

    Hi there!   Since I haven't got the time to play around with it, and it has been sitting there pretty much unused since I built it, I want someone else to enjoy this fabolous thing! :smile:   So: 100% complete MB-6582 (see attached pictures for colors) including 8x6582 chips (new old-stock) which is already in the unit. I also have an original C64 PSU which can be included if the buyer wants it - please note that this is the 230V european version!   This is the result of the first batch-orders of PCB's and panels.   I've put a lot of time into building and gathering the parts for this thing, so asking price is 6500 NOK (PayPal prefferable) incl. worldwide shipping.   Unit is working 100% without any noticable problems, but is sold as is, and are located in Oslo, Norway if there are any locals...     Let me know if you have any questions!       Lars  
  23. Live setup

    Hertz live! ThanksTK!  
  24. Midibox SID - Wiring it all together

    Hey everyone! I have been working on my SID synthesizer for the past couple months. I have the Core and SID modules (that I got from SmashTV) assembled, and my parts for the minimal control surface finally came in the mail.   I have attached images of the 2x20 LCD that I will be using. The problem I am having is that I do not know where to go to find documentation on how to wire this display up so that it will function with the rest of my modules. I bought it assuming that these universal displays have some sort of standardization. Given that you guys have set up an LCD display before what would you suggest?   Now for the power supply. I am going to find an old C64 power supply for sale (the commodores I ordered did not come with them) and follow this schematic:   The ground, J2, and J3 go to an audio Jack but I don't plan on using one. I want to use the midi out to connect to my computer where I hope to control my synthesizer in Propellerhead Reason 7. Before I deviate from the documentation I wanted to ask your opinion on this change to the design.   Thanks in advance!      
  25. Today I completed my base PCB for the MB 6582. I only have 8505 chips so I went with PSU option A. I tested the board voltages for the first time this afternoon and got proper readings for all the 5v pins on the SIDs, COREs, etc, but when I've tried testing for 9v (on J4 for example or J25) I don't get 9v. On J4 I just read 0v and on J25 I'll sometimes read around 5v (which drops down to 0 eventually). I don't have any chips placed in their sockets yet, but wanted to figure out why I'm not seeing 9v before placing them. Thanks!