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Matrix12x

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Posts posted by Matrix12x

  5. Moog Filter questions

    in Design Concepts

    Posted

    I am starting to work on a Moog Style filter in a size and layout similar to Seppoman's SSM PCB. My thoughts were to be pin compatible as far as headers. I am almost finished with my schematic and working on the layout. And will gladly make the schematic and PCB files available.

    I am using a LM13700 as a VCA to have voltage controllable Resonance.

    I was using Rick Jansen's VCF schematic with some changes. In Rick Jansen's schematic for the VCF, he uses some op amps for buffers and a difference amp. I have decided I would use discrete transistors. I'll post pictures as I go. I  am hoping to to a breadboard of the  PCB in about a week or two.

    Four quick questions:

    Is there a PCB house that does cheap one off double sided boards?

    Also is there a standard thickness such as 32mil thick that is more convenient to use?

    How is Eagle's autorouter?

    I have also seen a few different values for the VCF caps. is  there a preferred value?

    Any help would be appreciated.

  7. Almost done with my MB6582!!!

    in MIDIbox SID

    Posted

    :D

    Just completed my Main PCB and ran it thru it's paces last night. Right now I have all 4 cores in, and 6 SIDs. I have another two in the shop I need to put in. I ran the test tone app. No problems. Put the SIDs in, Test tone ran fine as well. I just updated the Cores with the newest rev of MB SID.

    I am kind of psyched now, so I may start building a wooden case this week.

     

    I have a photo of the working PCB below.

    P1010666.JPG

    I have a few more photos here at Picasa

    http://picasaweb.google.com/Matrix12x/MB6582?feat=directlink

    Maybe time to write some music and make a Youtube vid?

  19. MIDIbox SID V2 Editor

    in MIDIbox SID

    Posted

    Very nice work - unfortunately, I am having the same problem as Imp. When the program is first started I can Receive or send a patch or bank dump, but immediately after this I start to get error messages - sometimes there is an error about the midibox not receiving the correct number of bytes, then there is an error that communication has been lost. My SID has the latest version of MIOS and the SID app, also MIOS Studio (and other Midi software) works perfectly on this system, so I don't think it's a Midi problem (system is a Dell laptop with USB Midi cable). Any help would be appreciated. Cheers

    I am having the same problem on a Mac, OS X 10.4. never any problems w/ MIOS studio. Midibox Sid V2 Editor  starts out communicating, then has a connection issue.

  23. Instant and cheap PCBs.

    in Tips & Tricks

    Posted

    I just tried today using HP premium paper put into a photocopier, it worked great, and the paper is very stiff, so I didn't get the same problems I got with the cheaper photopaper getting wrinkly in the middle.

    I touched up with a sharpie.

    The etching worked out fine.

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