moebius

I browsed http://www.tastaturen.com for some time and come up with this: http://www.tastaturen.com/catalog/3341981256940/page661.html Bye, Moebius

Hi. Good question ;) I think that best answer is.. CASIO ;) or any other 80's home keyboard you can find cheap from eBay, newspaper classified ads, pawn shop.. Then again, those are probably matrix scanned keyboards, so I would advice you to wait for TK to finish coding matrix scanning routines, see: http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=midification;action=display;num=1084557362 It's also easier, as you don't need to wire switch per key.. You might be able to supply midibox with USB power, but be careful as USB is rated 500mA max.. Bye, Moebius

But still no velocity.. Bye, Moebius

Yeah, First time I heard of Chameleon was from Modulus site. http://www.modulus.synth.net/ (PPG'ish) MonoWave II sounds interesting.. and from my experiences (VST version) SpinAudio RoomVerb M1 should be a good quality reverb. A full list of apps for Chameleon: http://www.soundart-hot.com/english/users1.htm I don't think it's THAT pricey, considering it's from a small company, that really have to sell some units to cover development and production costs. It's also a kind of landmark for "open hardware" :D Bye, Moebius

Ok, I had a quick peek at your V3 design, and didn't see any errors. I think that you could get rid off jumper wires altogether, with some modifications. Like rotating cap C2 90 degrees, and running trace (C-D) under it and manipulating orientation of battery connections. ;) Moebius

Ok, back to OPAMP basics: OPAMPs have 2 inputs: inverting and non-inverting. Those OPAMP stages, with signal connected to minus (input) and plus (input) grounded are configured as inverting amplifiers. So, there's nothing to worry about. If you want to dig deeper in theory check: http://www.williamson-labs.com/480_opam.htm By, Moebius

Ok, let's see.. Yeah, IC's are flipped.. anyway: DO IT AGAIN!! Ever wondered, WHY you have 2 same type of opamps, but signals are wired to differend pins (besides of power)?! :o OPA2604 and NE5532 are DUAL OPAMPs, so there are 2 separate OPAMP circuits inside. Those OPAMP symbols marked U1 are build around one IC and same goes to U2. You better believe me  ::) and do the next version with only 2 IC's, ok ;) (Yeah, sorry.. It's good to exercise some schematic reading.. sometimes it get's really cryptic, when some logic chip is marked somewhere in the schematic, but its gate symbols are spread around) Also, I'd like to add that in my board creation process, I usually break circuit in smaller subsets in my mind, then place IC's first, and then rest of the components. And when routing, power goes first, and then "troublesome" signals (long traces/ with crossings). Bye, Moebius (<opinion> p.s. Autorouters just give you a looong coffee break, before you can start working</opinion>

Hi, I'll try to answer: 1. Yes, but there are only 2 IC's. Both of those are Dual OPAMPs, check markings inside opamp symbols and you'll see. 2. In THIS case, yes. (In some schematics it refers to negative power supply.. What, Standards, eh?! (But usually it's marked somewhere)) 3. I wouldn't trust myself on this :D (and I'm also a bit "Eagle restricted") I hope this helped, Moebius

Well, I try to "decrypt" Phattline's message: He is looking for someone from http://www.acidcode.de/ - ML303, TB-303 clone people. (I am NOT, but anyway) --- As it reads in the homepage - ML303 project is discontinued, no PCB's are available. And as far as I know, PCB layouts or schematics are NOT made available for the public. So, even as this project uses MIOS bootstrap for firmware downloads, and firmware updates are available, those are not useful without boards. Bye, Moebius

Hi, Synapsys! MIOS does support 4-bit interface for HD44780 compatibles, just check MIOS function documentation for MIOS_LCD_TypeSet. Then again, has anyone adapted custom driver for Mitsubishi M50530? I've got 3*40 LCD from an old Ericsson phone that uses that on 4-bit mode. Protocol is pretty similar to HD44780, but with 2 I/O control signals.. Bye, Moebius

Hi, Synapsys! MIOS does support 4-bit interface for HD44780 compatibles, just check MIOS function documentation for MIOS_LCD_TypeSet. Then again, has anyone adapted custom driver for Mitsubishi M50530? I've got 3*40 LCD from an old Ericsson phone that uses that on 4-bit mode. Protocol is pretty similar to HD44780, but with 2 I/O control signals.. Bye, Moebius

So, you could get me.. let me count.. 25 TR-909 knobs for "nothing".. I'll be damned. Bye, Moebius ps me, If you can ;) I might be even pay something for those..

So, you could get me.. let me count.. 25 TR-909 knobs for "nothing".. I'll be damned. Bye, Moebius ps me, If you can ;) I might be even pay something for those..

That' s so pro, so pro, grrr.. working for Behringer? Sorry, liked original (2*40, as yours) "Axels" more, as a design (I'm on the blue phase, you know). Incredible! But did I see "new" (only) board layout for those LC buttons, maybe? MBHP? :) Bye, Moebius

"Uuh, jea really.." sounding like Beavis comin' Â outta Butt"-Head..""But has anyone really heard any velocity on those redeavouass -pieces?! Bye, Moebius <not givin' any comments on those threads about IR sensors, just while ago>

Just google for "non inverting opamp" ;) Bye, Moebius

Jim Pilo has already modified AOUT driver to work with PGA2311 volume control chip. Check: http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=mios;action=display;num=1074625363;start=0#0 Bye, Moebius

Ok, pilo, you had a bit different concept in mind.. I'm thinking just a bit updated (non dedicated voice channels, RAM, MCU controlling playback addressing/speed) 80's concept. That maxim dac would give 8 note polyphony/ voice channels.. no mixing involved. As I started to count address/ data lines, I figured out that another core is needed for dedicated control surface. (And maybe for AOUT, giving control over analog filtering/ VCA's) Tired/outta here, Moebius

I was thinking 'bout something like 62256 SRAM (32Kx8, 3-state i/o) for storing samples, it's small, but more could be added (and something like LinnDrums original samples seem to all be 4kB size). And something like Maxim MX7228 (8bit, 8 channel dac, individual data latches/chan.) for audio out. So Pic has to handle sample saving to external ram, maintain sample address table and take care of playback addressing/timing ect. Of course some external analog prosessoring should be done, filtering, volume envelopes ect. Is this too far fetched? Bye, Moebius

Hi. Very interesting topic, really.. but no coding skills here :( I think that a BTc type of encoding is too "low end" for any musical use. But what 'bout cheesy, gritty, wwery 80's style 8bit sample playback (drum) machine? MIOS controlled, with an external flash or SRAM (something like 62256's) for samples, and DAC(s)? MIOS app. would take care of a sample playback logic.. and receive (SDS) / write samples to external memory ;D DIY dope for elekTRoheadz.. Bye, Moebius

I just read a message from Rowan, and thought that "Bode's Midi Translator" he has found, could be useful, as it translates midi messages also to pc keyboard strokes. http://bome.com/midi/translator/ I guess that most games have configurable controls, so if you map those to keyboard, then you can use Midibox as control surface ;) Will someone give it a try? Bye, Moebius

Hi! Oh, nice idea! ;) A long time ago I modified Korg Minipops 120 drummachine ("cheesy bossanova preset thing", but nice hats, and very nice 909ish snare) to accept external triggers for individual sounds and 16th note sync (and individual outputs), by just poking around pcb.. I think that DOUT's are ok for triggers, but on the DR-55's side I would recommend to use transistor switching to trigger sounds.. oh, and Colin Fraser has DR-55 service manual online: http://www.colinfraser.com/ Keep us posted, maybe at Midification, Ok? Bye, Moebius

Here's link to the discussion: http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=concepts;action=display;num=1071425010 Bye, moebius

Voltage dependant resistors (VDR's) are useless for this application (You are likely to see them in powerline filtering duties).. OTA's? Resistor linearized FET's? Bye, Moebius

:P Yeh, then again, I think that matrixing won't work with R2R DAC Â :D