SounDuke

Hi, Thank you Lall, the power consumption of the oled display is something around 100mA, the problem is that the graphic display consumes something around 250mA with 3V. I think I should make it with a toroidal transformer with 2 secondaries 9V, each 1,67A. The question is: I have yet the 9V regulated by the toroidal, should I apply something before the sid modules? I argue that I can't directly plug one 9V secondary to the sid modules. Thank you

could anybody tell me what's the overall power consumption of the 4 cores with a standard 20x2 backlight lcd and the sid modules logic, and the consumption of the 4 sid chips? I can calculate the power I need then adding the oscilloscope power consumption. Thanks

Thanks Thorsten, if I'm not wrong I argue that the low dropout option is to avoid malfunctioning derived by the discharge of the battery and the consequent lowering of voltage. Since I'm not sure wether powering it with a psu or the battery, I was wondering what is the best way out. regarding the PSU solution: For my MBLC I used 2 toroids which accept various input currents (110-220V 50/60Hz), because I travel to different places in the world and I fear the problems which could occur for example by plugging normal PSU's I could buy with Tokyo's current network (100V 50Hz) which is different by the European one. I own a C128 psu which accepts 220V/50Hz, so I can't use it without a stepper-down converter. Maybe the best configuration for the MBSID is to design a 2 toroid power supply like I did on my MBLC. regarding the Lead battery solution: If I use a low dropout 5V schematic, how to obtain the 9V line? is it ok to power the 4 Sids regulating directly the 12V with the 7809 on the Sid module? Thank you very much ^_^

sorry, I did that scope lots of time ago, it was on an issue of EPE magazine :( The battery is because I'm always traveling, and for the steadiness of current too, I would like to know if the separated 9V and 5V is absolutely needed or if it is possible to supply the whole MB with one 12V line. Thanks

Hello everyone, long time no see ^_^ I'm planning my quad MBSID8580 and I'd like to obtain precious suggestions from who has more experience than me. I'd like to build the Step C, 4 cores and 4 Sid8580 but I'm planning to add some personal features: -1 Oscilloscope -2 Oled 2x20 display -3 Lead battery powered N.1: I've built a little oscilloscope using a pic 16f877. It is stuffed with a KS0107 graphic display with backlight. It draws about 100mA. N.2: I'm equipping the MB with an oled display to reduce power consumption. N.3: I was thinking to power the whole synth and integrated oscilloscope with a Lead battery 12V 7Ah. What do you think? Is it feasible? I'm concerned about the regulator, as I think I'll go beyond the 1,5 Ah. I'd like to regulate the 12V through a 7809 and supply the 9V to the sids, then connect this 9V line to the 1st core 7805 to supply both the oscilloscope and the 4 cores. What do you think?

Sorry, maybe I took the wrong board to ask this, but I'd like to clarify my mind. Here's the situation: after building my range of midiboxes, I'm going to have concerts and I'm going to be the subject of videos and photos, to promote my performances. The fact is that I don't know how to handle the legal side. Maybe Thorsten could tell me what I missed in the licence infos. Regarding the personal design (exterior, shape etc.) of the midibox which I argue is not something which lies under the terms of MBHP licence, is there a way to licence it? I don't like the idea to protect even the design, but I want to know more about it. In addition to this, I will obviously state if asked that the name of this marvelous platform is Thorsten, but I would like to know what is the best behaviour Thorsten thinks one should go ahead when speaking in public of the midiboxes he uses. Thanks for the attention, and again sorry if I used unproperly this board.

from the specs of a fatar keyboard with 76 keys, they made the design using 8x20 matrix with 2 connectors with 20 poles; the keyboard is divided in two 8x10 separated matrices, the first for 38 keys (76 keys in total for velocity) and the second for the remaining 38 keys. I'm trying to figure out how to wire the 2 different matrices to the din and dout boards, any advice? Should I connect the columns of the separated matrices to the same shift register but wiring the lines to other din registers?

Ok qbas, thank you very much for the diagram! Well I was supposed to go to Fatar headquarters today but I had some problem with my alarm clock (and I'm pretending to finish other midiboxes :-* ), so I'll depart tonight to have an entire day (tomorrow) to write a catalogue by my own ^_^ I will send you all the prices and options for piano keyboards line (with hammer action) Hey qbas do you use Skype?

Hi qbas, obviously no secrets, apart from the color of the boxers I'm wearing ^_^ Probably you couldn't establish proper contact with fatar as they perhaps trash "normal" mail sent by mail clients and only read those you send compiling the form at http://www.fatar.com/home_fatar.htm . My advice is to let me make the eventual orders you want as their support is very bad for private buyers. I'm going wednesday to Recanati (Leopardi's house!) so if you want me to check prices and hardware let me know which models you would like to purchase. Could anyone host Qbas's docs?

Hi stryd ;) well the code is still available http://www.avishowtech.com/mbhp/files/sm_16x16_vel.zip, are you working on a different code? I'd like to know the hardware diagram since the setup looks different from the one depicted in the diagram of Thorsten's example. This way I can test wether Fatar's hardware is reliable and post the results

hello everyone, I'm going to buy some keyboards from fatar in Recanati (very good quality keyboards, if someone needs them you can contact me to ask them for orders as their support is not very reliable). I was astonished by the great effort profused by Qbas, thinking that his application may solve my problems. I'm going to buy 3x76 keyboards, I'll go to recanati to find out the mechanical and electrical specifications that they jealously hold and reveal only to those who order. FOR QBAS: By the way, as I haven't find any diagram except the SMexample by Thorsten, I would be interested in acquiring some docs regarding Qbas's setup of the 11x12 keyboard you used as I can't figure out how you wired the 2 dins and 2 douts. How did you change the message sent by each key? Thanks in advance

eheheh Good luck to you too :D

Hi Paul! Thanks for the suggestions, I had already spot the last link but not the first ^_^.

not exactly, maybe you are reading the wrong documentation. The protocol supports every function except the cursor leds and in my case (maybe because of Ableton Live implementation since I checked connection 1 million of times) the peak and the center led of the ledrings do not light up. My ledmeters work but are not reliable for metering dB (but they are for midi velocity). channel and bank l/r works perfectly, so connect them ^_^

Hi, I'm using my 2xcore LC with Ableton Live but as specified in the protocol they don't work

Hi, Thanks greenfox, but I'd like to realize a more custom design without pistons and pedals. I'm working together with a chapel organ builder who is helping me building the wood structure. I need to install on it reed switches and relative magnets, but I can't find cheap ones neither on ebay or on local stores. Any source?

Thanks jimhenry, but it looks a little bit expensive. I began to build the structure on my own (very similar to the one jimhenry suggested me), could anyone tell me where to buy magnetic reed switches? Or switches that are the best for pedalboards? Thanks

I contacted viscount, it appears that they don not sell pedalboard without pistons and expression pedals. Does anyone know where to find a 30 or 27 notes pedalboard with only the keys section?

Thanks greenfox, although I had previous experience with midibox, I have no knowledge regarding electrical organs (not sure wether the pedalboard has matrices or dedicated button per key) and that's why I posted my doubts. Thanks for the links ;)

Hi everyone. I'm approaching the study of 30/32 notes pedalboard to play my favourite trio sonatas by Bach. Since I'd like to buy an high end pedalboard and midi pedalboard on the market are equipped with up to 25 notes, I contacted a Viscount representative who told me that the pedalboard have not matrices but single normally open contacts (one per key). I'd like to buy one and midify it with MBHP. Is it possible? In addition to this, could any expert enlight me about different standards (AGO, RCO ecc.) I was thinking to buy an AGO radiating concave one. Thanks

Hello everyone, I'm building three keyboards with 76 keys using mb64 app. I'd like to display all the 76 keys on the lcd, but since I don't know the different performance of the displays (glcd 128x64 or character displays) I'm unsure of which lcd would be optimal to accomplish my visual needs. Any kickstart? maybe a 4x20 character display? Thanks in advance

Hi everyone, I was wondering if it is possible to change the channel# of midi events passing by the midibox. In other words, I own a keyboard which is not capable of channel splits, it is programmed to send note on/off on the whole range of the keyboard on only one of the 16 channels. Is it possible to change the channel byte of note on/off event sent out by the keyboard by sending that midi stream into a midibox with the applications currently available? That way I could achieve infinite channel splits on keyboard which are not equipped with this feature using the MB midi out. Thanks for the help

io sono di roma, niente soldi te la rimetto a posto gratis ^^ fammi sapere

Hello, I'm connecting the rest of the lc so I'm building the extension with 8 MF's. I installed the 2 additional midi in/out ports for the second core and declared in main.asm the XT header for the second core. Is it necessary to midi link the 2 cores?

yep Illogik, I think that is the problem indeed, Smash don't worry no ground on the heatsink. Because it's very hard that all the leds will be turned on at the same time, I think it will be no problem. At least as soon as I can buy a new transformer ^^ Thanks everyone