TK.

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Everything posted by TK.

  1. SPST Switches with Red LEDs Q

    You mean this kind of buttons? Yes, they are great! :) Best Regards, Thorsten.
  2. Hi Oozi, Experienced people need about one week, the others maybe longer - it depends on your ambition :) Best Regards, Thorsten.
  3. Low budget MIDIBox Plus 16

    Hi Nasty, yes, you can leave them out without further modifcations - just take care for the 4*10k pull-up resistors, they must be connected, otherwise the MBPlus will send out random button values. See also: http://www.ucapps.de/midibox/midibox_plus_test_16.pdf Best Regards, Thorsten.
  4. Hi Kristoffer, yes, you need 2 DINX4 modules. Regarding the DOUT: you can use one DOUTX4 and cut the SC, SO and RI track between the first three and the last shift register. On this way you've two chains which can be connected to J7 and J8 seperately. See also http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=concepts;action=display;num=1037272152 Best Regards, Thorsten.
  5. idea & question

    I would cut all tracks from the optical encoders and the buttons, so that the pins/connectors are free and can be directly controlled by the MIDIbox. The internal electronic of your mouse cannot be re-used, however the suggested solution is really uncomplicated. :) Note that optical encoders contain a LED which has to be powered - just take a 470 Ohm resistor in serial to the LED and connect it with Vss/Vdd (+5V) of the Core or DIN module. Best Regards, Thorsten.
  6. My SID is hot!!!

    You mean that one of the chip gets hot and has no functional cut-off effect? It seems that this chip is either damaged (after 20 years this could happen...) or a different chip-revision which requires another capacitor pair (C1/C2). You could try two 1 nF or 2.2 nF if available. Btw.: Since I built the MIDIbox SID I've tested 4 different SIDs and noticed that every chip has it's own sound ;-) --- especially the filters varying a lot. Best Regards, Thorsten.
  7. I already answered via EMail, here a copy for the records: ------------------------------------------------------------------------------- just a quick but (hopefully :) helpful answer: it seems that you didn't solder a 1k pull-up on pin RA4 of the PIC. This resistor is absolutely required, otherwise the firmware cannot determine if a bankstick is connected or not. You will find the pull-up resistor as R2 here http://www.ucapps.de/mbhp/mbhp_core.pdf - the schematic will help you to locate the correct pin. Another important hint: the serial input pin of the last 74HC165 requires a 10k pull-up resistor. In http://www.ucapps.de/mbhp/mbhp_dinx4.pdf  you will find this resistor as R36. Without this pull-up, the box will send random button events. Best Regards, Thorsten.
  8. PIC question

    Hi Adam, 24AA256 should work, PIC16F877A also - it's just an (compatible) redesign Best Regards, Thorsten.
  9. thanks for the reminder ;-) However, here a schematic of the touch sensor circuit which will be supported with the next MIDIbox MF version. In theory it could also work with other MIDIboxes as cheap button replacement, but this will not work until I've added the special charging pulse signal at Port J14 http://www.ucapps.de/mbhp/mbhp_din_touchsensors.pdf Best Regards, Thorsten.
  10. Prices

    no adaption is required. Just connect all open analog pot inputs to ground and don't forget the pull-up resistor on all digital inputs - otherwise the box will send random values. Best Regards, Thorsten.
  11. Another bankstick question

    Yes, the 24LC256 is ok; it's just the low-current version. Where did you find this chip? I would like to add it to the BankStick order list. Best Regards, Thorsten.
  12. midibox chain

    Alright - yes, for MB16E it's the same. You have to omit all optocouplers. They are only for "common" MIDI lines, which are working as opto-isolated "current loop". So long as you are wiring digital Rx/Tx signals, no additional components are required between MIDI IN and OUT. Best Regards, Thorsten.
  13. foot pedal project

    Sure, this is realistic. You could use the MIDIO128 with just a single DINX1 or DINX2 module for 8 or 16 buttons. This would come to about 25 EUR (w/o case, buttons & JDM PIC programmer). Or - if ableton reacts on program changes - this cheaper circuit could be interesting for you: http://www.ucapps.de/floorboard.html Best Regards, Thorsten.
  14. idea & question

    Optical encoders mostly send TTL pulses and can be connected to the DIN module on the same way like mechanical encoders - only difference: the pull-ups are not required. Best Regards, Thorsten.
  15. MIDIbox64SEQ Beta

    For the records: my answer to kierans posting can be found here: http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=concepts;action=display;num=1037621791
  16. Midibox64 SEQ

    Here the explanation of the MB64 tutorial: Snap Mode: When you adjust a knob in Snap Mode, the original setting determines the value until the point where the movement of the knob passes beyond this position. In other words, the parameter does not jump to the value as in Normal Mode. However, keep in mind that your adjustments have no effect on the parameter until the knob "snaps" on at the position equivalent to the original parameter. In SNAP mode, an right arrow symbol appears instead of the parameter bar. It indicates in which direction the knob must be turned to exceed the current parameter value. Arrow Left implies the value is lower. The parameter bar appears when the value is "snapped". And an example: your knob points to note C-1, you switch to another bank which restores the note F-3. When you now turn the knob clock-wise, it would send C#1, D-1, D#1 and not F#3, G-3, G#3 in normal mode. In snap mode no value will be changed until the knob passes the position for F-3 --- on this way parameter jumps are avoided. Best Regards, Thorsten.
  17. The purpose of the LEDs: if the appr. push-button is in toggle mode, the LED shows if the button is active or not the LEDs can also be controlled via MIDI. If your MIDI software supports some kind of feedback, you can use the LEDs to display the status of something (the MIDI event which controls the LED is the same like the event assigned to the appr. button) the MB64SEQ uses the LEDs to display the sequencer position the LEDs can also be misapplied as christmas illumination, you need: a core module running with any MIDIbox firmware a DOUT module the appr. number of LEDs (different colours increase the effect) some christmas songs in MIDI file format a computer with MIDI player software a christmas tree hang the LEDs over the christmas tree, plug the MIDI OUT cable of your PC into the MIDI IN jack of the core module, assign the LEDs to some notes of different MIDI channels, start the MIDI file player and enjoy the show ;-) Best Regards, Thorsten.
  18. Initially I planned to nominate only one well-made MIDIbox design per week, but this time it's really difficult.. in the last days I got photos from three outstanding projects which are the dream of everything from us :) So here they are - just choose your private favourite: MIDIbox64 with integrated TB303 synthesizer by Tom303: MIDIbox64 as "typographical synthesizer" by Rob: Multi-MIDIbox environment with a lot of motorfaders/encoders/buttons by Axel: Best Regards, Thorsten.
  19. Midibox64 SEQ

    Jump to this article :) http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=news;action=display;num=1034254654 Best Regards, Thorsten.
  20. Hi Stefan, Port 0. The order has not been changed in the mbhp_core version Unused outputs can be left open Best Regards, Thorsten.
  21. My SID is hot!!!

    The SID gets hot, thats normal. It's just good old analog stuff! :-) If the SID hangs up, it might be the reason that something influences the data transfers between the core and the SID module. I mean that ESD issue... e.g. if you have a temperature regulated soldering iron which switches on/off sometimes, this can cause unwanted transients on the data lines which disturb the data accesses. Or if your mobile phone rings during a SID session, the data flow could also be disturbed. Solution: build the circuit into a metal case like known from "real" synthesizers... You are writing that the cutoff frequency of one chip cannot be controlled. I hope that this isn't a 8580? Best Regards, Thorsten.
  22. Prices

    It depends on the quality and from where you order the parts, from the way you mount the stuff (PCBs or vectorboards), from the enclosure, from the available tools... it's really hard to say. I would assume that a least-cost MIDIbox with 8 faders, 8 pots and some buttons, built on a vectorboard can be realized for about $30. But the total costs increase fast when you order the parts from different shops, when you also need a programmer (btw: I still burn PICs for free), when the required tools like soldering-iron, cable cutter, etc. are not available. It doesn't make a big difference if you build a box based on the MBHP design or on the old MIDIbox Plus design, because the cost-intensive parts (pots/faders/PIC) are the same. Best Regards, Thorsten.
  23. one-peice PCB issue -->

    Best experiences have been made with seperated AIN modules which are as close to the pots as possible (see also the pictures at the bottom of http://www.ucapps.de/mbhp_ain.html). All other modules can be combined to one PCB without any risk of unstable signals. You could also try to create a AIN board which allows you to mount the pots - this saves effort, but requires some experiences in layouting a PCB. Best Regards, Thorsten. P.S.: I hope that somebody else can provide some good links to soldering guides...
  24. midibox chain

    Hi, sure, this is possible on this way: LTC J1:MI -> MIDIbox Plus Rx Pin MIDIbox Plus Tx Pin -> MB64 Rx Pin MB64 Tx Pin -> LTC J1:MO Hope that this short description is clear enough (just compare the schematics of the MBHP core, the LTC module & MIDIbox Plus). I will draw a diagram if required... Best Regards, Thorsten.
  25. Mixed-up SIDBox -->

    Hi, you just only have to take care for the different voltage domains (9V / 12V). If you create a single PCB for both SIDs and cores, you have to stuff one 7812, one 7809, one 7805: both cores and both SIDs can be supplied by a 7805 The 6581 additionally by a 7812 The 8580 by a 7809 15V should be ok for all 78xx in this configuration Best Regards, Thorsten.