jwillans

Hi Robin, Many thanks for the tips. I will take care to consider Caution 1, could there also an issue with the cables length between the din and the keyboard contacts? Since co-locating the din(s) and the core(s) will necessarily increase this cabling length. I don't think your second tip is relevant to me since all coupling is done in software. James

I found the following link extremely useful, perhaps others will too: http://www.eleinmec.com/article.asp?16 James

Actually I've just noticed that the lamps are 12V, so I guess it will be sensible to explore the SID documentation since they need both 5V and 12V supplies. James

Thanks again JimHenry - that makes sense. James

Thanks JimHenry, that makes sense. As I have indicated there will be two voltages at play - that of the midibox control system 5V and also that of the lamps 20V. Does it make sense to have two different power supplies for this purpose, or should I use a single 20V power suply which is reduced to 5V for the purpose of midibox? What is the easiest way of achieving a 20 to 5V reduction? Thanks, James

I have a question regarding the configuration described in: http://www.ucapps.de/midio128/relay_example.pdf There is only a single ground on the ULN2803, should this be used to ground both the lower voltage switches (from the DOUT) and also the higher voltage switches (shown as relays in the example, but lamps in my case)? Can different voltages share the same ground in this way (apologies for such as basic question). James

Per S. Thanks again, all is becoming clear. James

I'd be grateful for some more info describing strategies for chaining multiple core modules running MIDIO128. Is it as straightforward as connection midi-ins to midi-outs? Presumably the software is configured for cores so that midi data is unique, for example core1 to send data on channels 1 and 2 and core2 to send data on channels 3 and 4? Thanks, James

Thanks AudioCommand and Reiner. Reiner you are exactly right, I have various sources for getting these but they are quite expensive. I wanted just to check that there wasn't a cheaper alternative before I took the plunge. James

I'm looking to purchase some illuminated momentary switches to control the stops on a digital organ I am planning to build, these have an engraved cap denoting the stop. Here is a link to the kind of thing I mean: http://www.syndyne.com/products/lts.pdf Does anyone know of: a) sources of these types of switches in Europe? b) alternative switches that might perform the same function? Many thanks, James

Looking at the button example configuration for the DIN module: http://www.ucapps.de/mbhp/mbhp_dinx4_32buttons.pdf I notice that there is a ground for 2 * 16 groups of input. Is it possible for all 32 inputs to share the same ground rail? Indeed can a chain of din modules share the same ground? The reason I ask is that the (61 note) organ keyboards I am planning to midifi have a single ground rail which I would like to avoid cutting. Thanks, James

OrganGrinder and Per S - Many thanks for the info. I should have said DINs (rather than DOUTs). OrganGrinder - when you say "daisy chain" - do you mean via the midi-out to midi-in route as described in Per S's solution? James

Hi, I am new to this forum and am planning a church organ midification project which I think Midibox will be ideal. I have done a fair bit of forum searching and reading, I think midio128 is probably the key module for me. My question is, what if my organ has > 128 outputs? Is it then necessary to use a further core module-midio128 (multiple DOUTs) combinations and link together using midi-thru? Many thanks for the info and great project. James