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About fussylizard

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    MIDIbox Tweaker
  • Birthday 01/01/1970

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  • Location Austin, TX, USA
  1. Prototyping Board

    I've used BatchPCB and they were great. I've not tried anyone else.
  2. is busy doing some iPad dev...need to get back to my MB-SEQ

    1. jojjelito


      It's far too easy to be tempted by the dark side. Sheesh! After some H/W hacking you'll get weened off the instant gratification.

  3. TDA1543 DAC-based I2S board for LPC17?

    Interesting. However I just looked at the PCM1725 data sheet via Mouser and it says it is not recommended for new designs. Stock up now I suppose...
  4. Doug Wellington (MB-808) Contact / Status?

    And don't forget to opt-out of the new scanning equipment in favor of a pat-down. I did that last trip just to try it and it was great. Just make sure you have money for a tip. :-)
  5. +12/-12/+5 bipolar PSU circuit

    Here's the 5V switcher BTW: DigiKey p/n PT78ST105V-ND It switches at 650 kHz, so should be OK for audio purposes. Altitude has used this and had good results, so I plan to give it a go. Will report back my findings...
  6. How to specify the pattern to edit?

    So you just do track mutes to switch stuff then?
  7. +12/-12/+5 bipolar PSU circuit

    I'm using a center-tapped toroidial transformer, Digikey p/n TE62063-ND. I can't remember if that was the exact one from the MB-808 or not...I think it uses the 18V version, this is the 15V version. As I mentioned earlier in the thread, I basically ripped off the MB-808 PSU circuit and tweaked it for ease of construction. Hence the capacitor overkill...just wanted to limit the different types to buy. I may put heat sinks on the +/- 12V regs...I'll just have to see how they fare heat-wise. The switching reg for the 5V side should be OK.
  8. +12/-12/+5 bipolar PSU circuit

    Here's the thread about the 4xIIC board: I'm not sure what Altitude's plans are for it. I was already ordering some stuff from BatchPCB so I ordered a prototype 4xIIC board for Altitude at the same time. Maybe drop him a PM?
  9. +12/-12/+5 bipolar PSU circuit

    Oh BTW you can see in the pic that I mounted the caps horizontally to save vertical height in the case. That's why all the caps are along the edge like they are. Worked out pretty well.
  10. +12/-12/+5 bipolar PSU circuit

    Hey all, Just a quick recap on where things are. I got the board made (BatchPCB) and it tests out fine. I went ahead and built it with a standard 7805 regulator which gets *very* hot (not surprisingly!) but I wanted to test it out. I'm going to order a switch-mode 7805 drop-in replacement to handle that problem. They are about $15 a pop, but have very high switching frequencies so I should be OK even if I drive an AOUT_NG and SSM filter (which is the plan!). Two pics to share- Here's the populated board: Here is my PSU board mounted in my MB-SEQ. I'm using the same case that Altitude used, though I'm quite a ways from being 100% complete on it. You can also see in that pic a prototype of Altitude's 4xIIC board, as well as my painting of the base (in-progress...first attempt was a train wreck...) Will let you know how the switching regulator works out... Regards, C
  11. +12/-12/+5 bipolar PSU circuit

    @middleman - Interesting details on linear PSU design, thanks!
  12. How to specify the pattern to edit?

    One more thing to ask you seq expert users out there. Given that 4 tracks are saved with each pattern, any recommendations on how to best organize things? I thinking I would use G1T1 for drums, G2T1 for bass, G3T1 for lead, and G4T1 for something other stuff. That seems logical but also seems wasteful since I am only using 1 track per group. Any tips on what has worked best for you? Thanks, C
  13. How to specify the pattern to edit?

    Thanks for clarifying the intended workflow TK. That helps a lot! I was playing with the seq some more and another thing that I think I was overlooking is that you have to save your pattern before switching to a different one. I was confused before since I thought the seq was saving all the patterns for me as I went. But the correct workflow seems to be: - Create a pattern in A1 - Save it into A1 - Save it into A2 (copy A1 into A2) - Switch to A2 via the pattern screen - Edit A2 to create a variation - Save A2 into A2 - Save A2 into A3 (copy A2 into A3)...etc. I am getting much better results now that I'm saving, LOL! Thanks! C
  14. Doug Wellington (MB-808) Contact / Status?

    Really excited to see the regular project updates on the www.eight-oh-eight.org site! Thanks Doug!
  15. How to specify the pattern to edit?

    I'm not understanding how the seq works regarding tracks, groups, patterns, and songs. Hopefully someone can set me straight. I have read (as well as read the manual, watched videos, searched the forum, wasted hours fiddling, etc.) but I'm still stuck. I'm basically trying to start by making a simple song. So I fire up the seq, create a new session, go to the edit screen for group 1 track 1, and get some notes playing on an outboard synth. So far so good. Next I want to copy my synth line and make a variation. I think I need to copy the track, select a different pattern, and then paste the copied track into the new pattern and edit away, but I don't see how to select different patterns. How do I specify which pattern I want to edit? How do I know which pattern I'm editing? Do I need to be in song mode or phrase mode when creating patterns? I tried doing copy, then going to the pattern screen and switching group 1 from 1:A1 to 1:A2 and then doing paste, but that doesn't seem to do what I want either. Anyway, once I have multiple patterns defined, I believe I need to go to the song screen, and select song mode, and select the pattern I want for each step in the song. This part looks straightforward. So I've been looking all through the pattern menu, save menu, and song menu, but I just can't seem to sort this out. What am I missing here? But even without being able to create more than a single pattern, the seq has been super fun. An incredible design. Hats off to TK and the others that made this happen. TIA, C