skunks

I'd like to buy a couple of 6581R4

I've also thought about the similar project. What do you think, using CORE_STM32, how long does it take to scan e.g. 120 keys? Will scan rate be sufficient to determine correct velocity?

Hello guys! Please include me. I want 20 transparent knobs.

Check this out http://cgi.ebay.com/Midibox-SID-Sammich-MOS-SID-6581-8580-6582-Sidstation-/250751847073?pt=Keyboards_MIDI&hash=item3a61f98aa1

Thank you. I remember I've seen somewhere at the forum some info about core32 sid (how much SIDs can be connected, etc). But searching for sid mios32 and sid core32 didn't give any results.

There is midibox_sid_v3 code for mios32 at http://svnmios.midibox.org/listing.php?repname=svn.mios32&path=%2Ftrunk%2Fapps%2Fsynthesizers%2Fmidibox_sid_v3%2F Please suggest core32 + SID modules connection schematics.

I've not seen any Micro SD cards with required speed factor (in order to build Ultra Low-Cost Adapter of an adapter socket).

What about SID modules with SIDs?

I'm interested in mb6582 and/or SID modules. What is the price?

I'm interested in PIC18F4685 and SID

I've used changeover switches similar to that But the only difficulty is that they are too long to build other than piano-type keyboard.

at http://www.cedos.com/e510_midi_chip.htm

Do you currently have mb6582 panels and/or PT10 cases?

Thank you TK! So, no sequencer functionality will be included for a start. May be some basic sequencing functionality for live recording will be added later.

Hawkeye, maybe you are right, thinking about the future I'll add a couple of MIDI OUTs :)

Can I build MB SEQ V4 without IIC MIDI? I don't need so many midi outs :)

I'd like to build midi accordion with integrated sequencer. Left hand buttons (92 buttons) are simple changeover contacts. But what about right hand - I'd like to create "deep-sensitive" keyboard, so I have to process 62 analog inputs. + maybe 3 analog inputs for bellows control and aftertouch for left and right hand. So the first question - is it possible at all to capture 64 analog inputs with Core32 at all (I hope the answer is YES, STM32 has ADC with max. sampling rate is about 1MHz). So the second question is is it possible to capture 64+92 analog inputs so I will have left hand buttons deep-sensitive too. I've found an example only for 64 analog inputs. And the third question. Is there any spare idle time in MBSeq firmware so I could add this analogue (and maybe digital) keyboard scanning?

I'd like to etch GM5x5x5 PCB for myself, but there's no Eagle file available. Please suggest how can I remove unwanted layers from PDF file provided? There is almost impossible in Photoshop (1000+ layers !)

There is a nice chip E510 for $20 that does a job I'd like to implement on core32+dinx: http://www.cedos.com/e510_midi_chip.htm (see datasheet) Why not using this chip? Because anyway core32 module is used and, I think, it won't take all of it's resources to scan ~128 keys. Then you may ask WHY CHANGEOVER type of contacts? 1. This type of contacts if the most convenient for implementing mechanics on pianos, accordions, organs. Mechanical calibration is simple. There is one pin for each key switching from one common bar bus to another (so called NO and NC buses). Time between switches is mapped to note velocity. 2. You have to connect as many wires as many keys you have + 2 (NO bar and NC bar). That's an advantage comparing to industrial contact matrixes that has twice as many contacts. Switch over contacts from my accordion (yet 1 bar missing, sorry) and scan matrix from Roland synth: 3. Anyway you have to use diodes for the matrix, so why don't use multiplexors (or shift registers like on DINX) instead ? :) The prices for those industrial keymatrix parts are $155 for PCB + $5 * 4 for rubber contacts = $175 (prices found here http://www.midi-store.com/Fatar-keyboard-parts-p-1-c-360.html ) Maybe PCB can be etched by yourself, so one could buy only rubber contacts, but they don't fit into every music instrument that one would like to midify. Changeover type of contacts are universal :) So I have one idea how to scan changeover contacts via DINX module. Ground of the contacts in DINX module will be no longer Ground. It will be connected to NO input bar or NC input bar during key movement. So in order to distinguish between those 2 bars I have to connect both of them to digital outputs of stm32 chip. Scanning process will be made in two stages: 1. Set NO bar to low, NC bar to high, scan all the contacts. 2. Set NO bar to high, NC bar to low, scan all the contacts. This way I'll get to know that contacts are pressed to NO bar, what contacts are pressed to NC bar and what contacts are in intermediate state (not pressed to any bar). Am I thinking in a right direction? Can I replace GND in contacts in DINX module with stm32's outputs?

Thank you janvanvolt! I loved that buttons because I have a couple of them from my old Soviet chromatic electronic accordion. It has a changeover type of contact that inspired me to use them as velocity-sensitive note buttons. Unfortunately I don't know German, but I liked also round buttons on the site you found. If any of that round buttons also have changeover type of contacts, I can build velocity-sensitive chromatic keyboard! (or may be such a project was already made by somebody?)

Don't anybody know where to buy these lovely black and white buttons with leds that acts as piano keyboard on Transistor6 303 Sequencer project above?