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SLP

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Posts posted by SLP

  1. [gone] Dual SSM2044 VCF PCB

    in Fleamarket

    Posted

    Hi,

    apparently the 12-year younger me thought that this would be a great project to build "some day"...

    So here's a PCB that's been collecting dust for quite a while. (Actually not that much dust, since i found it at the very bottom of my "Things to build" cardboard box...)

    The silkscreen is a bit unfortunate contrast-wise. It says "Dual SSM2044 VCF, T. Stoeckl 2008"

    cheers,

    Matthias

    20201224_161018.jpg

    20201224_161024.jpg

    20201224_161042.jpg

  5. cherche un clavier pour emprunter à Marseille

    in Français

    Posted

    Salut!

     

    je vais etudier au école centrale de septebre à février, et comme je voudrais continuer à faire du musique, je cherche un clavier, synthetesizeur ou un controlleur-midi.

    J'espère qu'il y a quelq'un dans cette region, qui peut se passer un instrument.

     

    Mes instruments sont trop pesants pour l'emporter et je ne veux pas acheter quelque chose pour cette temps courts.

     

    -matthias

  6. Cubemaster 3000

    in Miscellaneous

    Posted

    Hey there!

    University is a bit tougher than i expected ;)

    I'm still somewhat active, but I felt that I should show you some kind of sign of life.

    There was a competition at the university (www.adveisor.ei.tum.de).

    The challenge was to build a robot that can solve a rubik's cube in less than 150 sec.

    Well, among the 8 teams, only 2 robots were more or less working. And though our robot had some mechanical issues, my team won the competition!

    Probably because we had that 'special' feature ;)

    Unfortunately there wasn't enough time to add MIDI-Support...

  7. Wohnung in München

    in Deutsch

    Posted

    Sich ab und zu mal gepflegt die Kante geben ist ja nicht prinzipiell schlecht ;)

    Und 200€ Warm für ein 12m²-Zimmer in einer WG mit großem Wohnzimmer, Partykeller und Haushälterin/Köchin sind so ziemlich "unschlagbar".

    Trotzdem wäre mir jede Wohnung im Umkreis von ca 5km um die Uni recht... also,.. falls da irgendwer was weiß...

  8. Wohnung in München

    in Deutsch

    Posted

    Burschenschaften sind IMHO eher etwas rechts-konservativ... da würde ich aufpassen.

    Liberale Verbindungen sind leider selten.

    Wichtig ist nur, dass man keine "schlagende" Verbindung erwischt... außer man steht auf Fechten :blink:

    Das mit den billigen Zimmern funktioniert auch nur deshalb, weil du als "Alter Herr" auch nach deinem Studium deinen Jahresbeitrag zahlst... quasi eine Art Generationenvertrag, also nicht unbedingt schlecht.

  9. Wohnung in München

    in Deutsch

    Posted

    Nach langer Midibox-Abstinenz nun mal wieder ein Post.

    Ich hab da nämlich ein Anliegen... :whistle:

    Dieses Wintersemester fängt mein EI-Studium an der TUM an.

    Und da ich nun schon seit über zwei Monaten hoffnungslos auf Wohnungs-/WG-Suche bin, wollte ich mal fragen, ob mir denn hier jemand irgendwelche Tipps geben kann, wo denn im Umkreis von ca. 3-4km um die Uni (Stammgelände, nicht Garching) noch Wohnungen oder WG-Plätze frei wären...

    Ich bin für jeden Hinweis dankbar.

    Hat eigentlich wer Erfahrungen mit Studentenverbindungen?

    mfg matthias

    p.s. dieser Thread darf auch gerne nach 'Misc' verschoben werden.

  11. inverting and amplifying LM3915 VU-meter-IC

    in Miscellaneous

    Posted

    hi folks,

    I'm about to build a bigger VU-meter using the LM3915.

    The IC has open collector outputs which can sink 30 mA max. I need 120mA per output.

    first Idea: 4009 inverting buffers (with pullup reistors) and some ULN2803 (or 2804) driver ICs. But I guess, that's pretty hardcore.

    second Idea: would a simple PNP-transistor per output work? Any Idea, which type would be suitable for 120mA@5V ?

    thanks in advance.

  13. Pot control for ssm filter bank?

    in Miscellaneous

    Posted

    Hi

    has anybody ever come out with a solution to control the ssm filter bank (Seppoman project) with a simple stereo pot? You know it s time to put them to work somehow..

    wouldn't a pot wired up as voltage divider work?

    I don't know about the linearity between CV and Cutoff Freq. You might end with using a log pot.

  15. grafikfehler bei s-video @ c64

    in Deutsch

    Posted

    Ich weiß nicht ob dir hier jemand helfen kann.

    Aus dem C64 werden hier meistens nur der SID-chip und manchmal auch das Gehäuse "recycelt".

    Im englischsprachigen Forum stehen deine Chancen auf jeden Fall besser.

    Ich weiß nicht mal, von welcher Anleitung du sprichst.

  22. USB powered core module

    in Parts Questions

    Posted

    I'm glad your PC survived relatively unharmed! :)

    Thanks for the pointers! I've measured my core and I read 114mA, so I guess it wont work, bummer. I,ll stick with the adaptor and use a battery pack for when I'm on the go, It would have been nice with a usb powered all-in-one box thou :(

    well, If you don't want to mess with USB power requests, there is a simple workaround.

    I've bought a USB-Hub at RadioShack some time ago (GM5*4= 20 MIDI I/Os - yeehaw! (I discarded the Idea after I realized that this would be a slight overkill)).

    The cable that came with the Hub had a mini-USB plug on one side (for the Hub) and two (!) USB plugs for the PC.

    I've attached a picture, so you know what I mean.

    I've just checked it with my multimeter, and it seems that the power-lines of the two plugs are connected in parallel.

    This way, you could increase the max current to 200mA.

    I don't know if this way of increasing the current really works (there is a jack for an external PSU...).

    It doesn't seem to do any damage to the Hub it's connected to right now.

    Perhaps you should search the internet for connecting two USB cables in parallel if you like this workaround.

    post-4318-127119157924_thumb.jpg

  24. USB powered core module

    in Parts Questions

    Posted

    Ok, thanks! What happens if the current goes beyond 100mA? I've seen usb-devices such as lamps, fans and even coffee-heaters, are these passive or do they communicate with the HUB to request current?

    dunno. I guess they're requesting the current (at least the heaters. 100mA seem to be sufficient for LED-lamps and weak fans).

    When i measure current, do I just measure it over +5V and ground on the board or do I have to break the circiut in order to get a proper reading?

    Current is charge/time. when you want to measure the current, you have to basically 'count' all the electrons that go through the usb-cable in a certain amount of time.

    Therefore you have to break the circuit and put your multimeter in between.

    what you've described was measuring the voltage (drop) across a device.

    I dont want to short out my computer :)

    heh... I actually did that some years ago with my attempt to build MBHP-USB-MIDI-Interface (the old one with the AN2131SC-IC). I somehow managed to get a big drop of solder into the USB-socket of the Interface, so that all 4 pins were shorted.

    When I plugged it in, My PC was instantly shut off, but he survived it (with the exception of one usb-port...)

    About the blacklist, I saw it after I bought the midi-cable and was a bit bummed my ( ebay no-name cable) was blacklisted. At first it didn't work but I later discovered it was due to a loose midi IN connector. Fix it and now it works perfectly.

    I guess it wasn't blacklisted because of some defective connectors. There might be some errors when it comes to sysex messages, i.e. when you want to program your PIC over MIDI (dunno how it looks like with the new CORE32). If you're looking for a incredibly cheap and relieable 5-I/O MIDI-USB-Interface, you should search the forum (and the WIKI) for "GM5".

    I just finished my first shoe box enclosed prototype last week and it works like a charm.

    nice to hear! keep the work up and post pictures as soon as it's finished :)

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