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technobreath

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Posts posted by technobreath

  1. MBHP_ETH, MBHP_SDCARD, SSM2044, SSM2164 PCB Bulk Order

    in Bulk Orders

    Posted

    yo,

    i have forgotten about this thread, but I promised an update after talking to seppoman. Design has been tested in private closed trials, and works great. But there is not gonna be a public release of the files, simple reason is that there is too many people outside this forum copying and reselling that stuff, and either me or anyone else want that to happen. However, there is a chance that a new design - a slightly different approach - based around 2 ssm2044 that will become available for u guys to buy, but timeframe is not set yet.

    anyway, that's the status from my side on my reproduction of seppos exelent and hard work :).

  4. [WTB] SSM2044 PCB (Seppoman's PCB)

    in Fleamarket

    Posted

    Dudes, wicked1. For me this is not a big deal but as thomas basically told me:

    If one of the bosses gives me the OK, I'll upload it
    <- not OK at all unless himself comes by and says it is ok to share it.

    (Or just PM me, if someone wants it)
    <- that was not what we agreed on when u received the files.

    Look, I'm not trying to be cheap or bitey, and I get that you made the traces wider and pads bigger, but if I udnerstand it coreectly, this is mostly based on the files I sent you, meant for a more private setting than this forum, and the way I see it, the files are not either my or yours to share (except for within the terms given by thomas).

    So unless you changed the design (which it seems like u didn't "It's basically his board w/ larger traces and pads for easy etching.") we should still keep this private.

    Basically and short story - This is no big deal for me, and I am not pissed or anything, but it is very important for me to honor Thomas' wishes about this. Remember I told u that if u were to get the files from me, that I didn't want this to come back bite my ass later on - offering the files like this potentially does that, puts me in a bad position towards Thomas.

    Me and Tim are in the process of designing a new filterboard for his shop, <- a bit different approach than Thomas' designs. And I for sure do not want to appear like I have done something that Thomas told me not to do (assist in the sharing of the files for example) etc. The reason for not sharing aint profit or anything, but clearly not to see the design cloned and sold on ebay or dealextreme. Both the seoppoman board, and this new upcomming little secret.

  7. new user in australia....

    in MIDIbox HUIs

    Posted

    i just wanna step in here myself and do the welcome greeting :D. You will find this place a very nice place to learn about this stuff that you ask for.

    You say that you want a maybe 24ch daw controller. You should really look into midiboxLC instead of 64, as this emulate Logic / Mackie control surface stuff. it's fairly old project, and I'm not exactly sure if the new version is out yet in it's complete form, but it will be. Newer brains = more possibilities. Just read around and see what you can find out <- ucapps.de is definetly the place to start reading. Combine it with midibox wiki where a lot of detailed info especially about the user projects can be found.

    And though DIY is really funny, I can also sign my name under that statement, that it aint dirt cheap. it can be cheaper than commercial, but it may also end up more expensive. The big advantage is that u can spread costs out over a long period of time - and that way on a tight-ish budget. Just depends on how u wanna do it ;).

    A last word on that 24ch controller. of course it all depends on how complicated u want it, and how many controls u want on it, but any way you look at this, it is gonna be a pretty big project. :) - so u for you own good hehe i just urge you yet again to not fall into the trap thinking that it's gonna be cheap and easy. But it can absolutely be done if you want it. I don't try to talk you out of anything here ;) - just giving you a heads up - many people jump into something that ends up too big for em, and it distroys the motivation. But if you want it, and you feel u are up to building it, go ahead do it <- you will find a lot of incredibly talented people here that go out of their way to help you solve the problems :)

  10. Safer power supply

    in MIDIbox SID

    Posted · Edited by technobreath

    But that is basically just the same as the above - you convert all that energy into heat, only that you don't do it inside the VREG but inside the resistor...

    Sure it is, no doubt about it - just another patch :). I'm just saying, it's a pretty crude and simple way to burn off a little heat outside the vreg if it's too hot already. But I would definetly stick to doing it the right way myself. Proper voltages / proper heatsinks. I'm just agreeing there are alternatives if a rebuild / new transformer isn't sounding as nice as a power resistor. :P

  12. Safer power supply

    in MIDIbox SID

    Posted

    Hehe hawk

    don´t wanna fuel the holy switcher/linear war here

    I haven't realized before now that there was one, but now that u say it :P. I have always been part of the linear camp myself. But switchers is probably the future I guess, but 54khz I also expect to be a bit too low.

    But, it's a different transformer, so irrelevant, I guess.

    It's like this - there's no magic, only math (in which I suck btw) but it's like shuriken lays it out:

    VAC * 1.4 - 1.4 = Rectified voltage.

    Also the 7809 has a pretty good input range up to 35VDC; so the vreg is fully capapble of handling the drop from the 18-20vdc to 9v. BUT a large heatsink is required - I don't know by hand how to calculate the size, but the vreg can't operate in higher temps than 125 C. Then again, it might be easier, less bulky, less work to just use a second transformer for that :P

  13. [WTB] Waldorf knobs (or similar)

    in Fleamarket

    Posted

    Dude, if someone is up for the task, there is an "ongoing" thread about the "waldorf" knobs. I can't organize a bulk since I'm not in EU, and it doesn't make sense at all to have to include the extra costs (all the customs fees and so on) - shipping from germany to norway, and then mostly back again would add too much to the cost.

    Don't know what I have written there in that thread before, but I have a standing offer when a bulk happens - I'm in for 50-60 knobs when the time comes :).

  15. Safer power supply

    in MIDIbox SID

    Posted

    Yeah, shuriken is right. Using 12v secondaries for 12VDC isn't leaving much room for shit to happen.

    I didn't catch how much capacitance u got before the regulator. Adding more can help a little, but it's more like patching up a thing that really needs stitches. A couple of things to keep in mind when adding to the cap value before the regulator. Inrush current will increase. Either you tame it (can be done in a pretty crude way using a ntc thermistor) or you make sure that the rectifier circuit and the transformer will handle it in the long run.

    Please be aware that this is based on my theoretical knowledge. I used to tinker around with simulations on linear supplies, and that is basically where this statement comes from - it could be wrong - or irrelevant.

  16. midiboxSEQV4 on stage, live performance

    in Songs & Sounds

    Posted

    Dude, a day without the forum today made me look towards midibox blog, and I discovered this!

    W O W !!!!!

    Very catchy tune - james bond-ish - Iike it a lot! Having a lot of my musical background from brassbands, I appreciate this a lot. You really nailed it with this tune - combining the blowers with electronic music. Reminds me of film music.

    And the visual show was also great! :).

    Have fun doing this - look forward to seeing more :).

  18. Safer power supply

    in MIDIbox SID

    Posted

    It goes without saying that 8580s and 6582s need +9V, but these are already on the SID module (that's why I said this PSU works with no mods with MBSID projects, as opposed to C64 PSU).

    I knew you knew it :) - but I just wanted to clarify it. Believe it or not, there are many people in here that do not know natively what voltages goes to what SID, so that is the only reason why I said anything - becasue it does not go without saying for many people like it is for you and me :). And you actually need to put in the right kind of vreg on the PCB in order not to kill it. Hehe, this aint a pissing contest - I just wanted to clarify all the facts for all the people who reads it. I know u know how this works, but that aint the reason you write anything here? It's because you want to help others who might not know, and then it is just a little bit dangerous to assume that they know all the things you take for granted. So please, no hard feelings at all, I am now / wasn't in the last post after you ;).

  19. Safer power supply

    in MIDIbox SID

    Posted · Edited by technobreath

    Just thought I'd shoot in a comment. I can't remember it being discussed in this thread. The MeanWell powersupply is: "Fixed switch frequency at 100KHz" - which is well above audible range. But it might be a bad idea to go there if you record or if it is possible that you will ever record it with those high sample rates, 192khz, no? It is IT and Med. equipment approved, but that does not automatically mean that this is suitable for musical applications... Just a heads up if some of u didn't think of it already.

    If building your own is an option - then have a look at this: http://www.murata-ps.com/data/power/oki-78sr.pdf <- switch frequency @ 500khz. I have seen similar ones @ 1 MHz too, but then it get a bit more spendy :P. This one is fairly cheap @ Mouser, but expensive in comparison to linear regulators bought from shanghai @ ebay :D.

    I have not much experience in building switchers. It's a bit more rocket sciency than the most basic linear designs, but not impossible at all if you read some d.sheets, app. notes. of course it helps if u know a thing or two about electronics. <- which can be learnt also :). I have learnt most of what I know from internet studies. But also from some electronics school books I got from a friend and also some from my brother way back - really helps you grow an instinct on how to seperate the good stuff from the bad stuff online. I also had VERY much help from many people @ midibox.org.

    So I know that:

    ...or better yet, are there any for sale?

    ... you don't need to go there - at least not in the long run. You probably buy one now (and we have no problems with that hehe), but I guarantee you will enjoy making your own once u get a bit more hang of the elctronics.

    EDIT:

    don't know much about MB6582 but if it has a C64 connector I bet it has such a circuit integrated).

    It has the DIN c64 power connector indeed. And it also got regulation circuit. BUT read the wikipedia site - it's all in there - there are several powering options, and not reading this, just assembling it and put the plug in and power it up is not a smart thing to do at all.

    The Meanwell RPT60-B PSU doesn't need any sort of modification to work with MBSID projects

    You are partially right here. You are right, it gives you v5 and +/-12V. But SID 8580 and 6582 does NOT accept +12V without a fight. They need +9V. 6581 uses 12V. Also be aware of the powering specs of the -12v rail (depends on what you are using it for, but it might not be big enough).

    So basically what you can do is to leave the vregs on the PCBs where the 9v SIDs is gonna live, then feed it with all the 12v you want ;).

    It is important to think of PSU as a the whole circuit, not just the external stuff u buy or build -> there might be PSU components on the midibox pcbs also :).

    (but the C64 PSU does, that's why you need to bypass it if it's already in the MB6582 board).

    The C64 brick needs modifications? No, it just needs external regulator circuit to give u everything you need. I understood what you meant ytsestef, but I just wanted to clarify what you were saying.

    On MB6582, you have the luxury of setting it up for all kinds of powering options. It is described very well by Wilba in the wiki pages.

    Have a nice day / morning ;).

  20. LCD

    in Parts Questions

    Posted

    Dude, probably we can't expect more from these hehe. So it looks like the datasheet is wrong then... Interesting to know. Btw, don't tell missus I wad here, I am supposed to be at SARC. If she catches me in here I would probably end up in trouble :-p

  22. Safer power supply

    in MIDIbox SID

    Posted · Edited by technobreath

    Man, this is a nice thread. And man, there has happened a lot with availability in good switched regulators since that thread started. I have previously said I would never be converted to do switchers instead of linear, but with the speeds of modern switchers, this all seems way more attractive to me than before. But in that thread there are lots of info if you are hungry for that.

    Another tip that I can give you - if we step away from the DIY (oof hehe) for a little while. Many people buy their power supplies anyway, so I gather it is OK hehe. My thought is - get someone to help you build it if you (after reading the thread) isn't able to build it yourself. You know any electronics students? or one that teaches it? Don't even need to know people - you could contact a school where they teach electronics - I bet designing and building a power supply like this would be an interesting project for at least a couple of students. Just a thought.

    But then again, I really really want to encourage you to learn this yourself. A basic powersupply is basically made out of 3 parts. 1: rectifier 2: smoothing caps (which is related to rectifiers) 3: regulation/protection. Regulators made out of ICs (most common around here at least) mostly has the protection you need in most cases (temp.shutdown, over current shutdown and so on). If you study these things - and there are a lot of online material - you should be able to construct your own. Be sure ALWAYS to use fuses though. IMPORTANT :). <- might not help you protect the circuit from getting "fried", but it will probably prevent fire :D. I have had myself a PCB on my bench cooking / frying becasue I had no fuse when there occured an error - haven't concluded what went wrong there yet, but we think it's a faulty vreg. That in combination with a big battery and no fuses made PCB cooking possible.

    EDIT/ADD:

    I have no idea how this works in USA, but in Norway I would make a phonecall to teacher / faculty bossy guy, and present my project / my intentions of calling him...

    http://www.ece.ucsd.edu/

    No idea what kinda place this is - after all, I'm only a norse guy. But it looks like they are good enough equipped to help you out if they want to :).

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