DIYAPASON-L Digest #548 - Sunday, March 31, 2002
Re: [Residence Organs]  Re: organ relays
  by "Paul Arndt" <>
Re: [Residence Organs]  Pedal Contacts
  by "Tony Newnham" <>

(back) Subject: Re: [Residence Organs] Re: organ relays From: "Paul Arndt" <> Date: Sat, 30 Mar 2002 22:55:49 -0800     At 05:50 AM 3/29/2002, you wrote: >Randy Terry <> asked about the Artisan relay and = the >possibility of a computer crash. Doesn't the Artisan system use >microcontrollers in the relay, with a PC being used only for making = changes >in the specification?   The Artisan system is the system I will use if I ever get that far... progress is slow on my project as I don't have a place to put the organ at =   present due to zoning issues and some other issues, but that is another = story.   From talking to the Artisan people my understanding is the same as yours, =   that a PC is used only to initially configure the relay boards or reconfigure the relay if the organ changes (new ranks added, new stops added, etc.). Also, I live only about 300 miles from Seattle where they = are headquartered which is handy if problems arise. The one problem I have is that my Wicks TO uses direct electric action chests which draw a hefty current. The Artisan will handle some of the direct electric action = magnets but not all (generally the high pressure ones which I have) so I will probably have to have a driver board to handle the chest magnets current between the Artisan output and the chests themselves. This is not = difficult but just an inconvenience.   Also I know a local organ hobbyist who is using the Artisan relay system and was really impressed with it as he had several 12-note offset chests = in close proximity far from the main chests which were being driven from one driver board. He was able to configure each of the offset extensions for each rank to appear to the organ as if they were on one "virtual" chest. = To wire the offset chests from the main chest driver board would have = involved a lot more wiring. It is a very flexible system. Artisan is a very small company and so they do not have the dedicated resources that many larger firms have, but they are very responsive to questions. I have found them very wonderful to talk to and they have always answered my questions in a very expedient way.   Paul Arndt      
(back) Subject: Re: [Residence Organs] Pedal Contacts From: "Tony Newnham" <> Date: Sat, 30 Mar 2002 10:48:37 -0000   Hi   I'd be interested to see detail of your pedal contact system. I've got an old pedal board that I want to use as a MIDI controller.   Every Blessing   Tony ----- Original Message ----- From: <> To: <> Sent: Friday, March 29, 2002 7:55 PM Subject: [Residence Organs] Pedal Contacts     | Although the project for which I needed to add pedal contacts ended = before I | actually assembled them I was going to use a home made optical switch. = The IR | detectors (receivers) and the IR diodes (transmitters) each costs 19 cents. | The detector will drive the input of a 2803 driver chip high or low, depends | on whether you make or break the light beam and the 2803's will drive = any | magnet or could be scanned for MIDI. 2803's seem to be the most commonly | used, inexpensive driver chip around, having 8 channels and costing = about 60 | cents per chip or about 8 cents per channel. Therefore the "contacts" would | cost less than 50 cents each plus a little work. My mounting scheme was super | simple it all seemed to be workable but I just didn't need to do it = after | all. I would be glad to explain further privately and send a sketch. It would | be unusual but leaf contacts would of course be simpler. Just don't use | something that turns out to be noisy like some micro switches. | | John Adams | | DIYAPASON-L: a Discussion list for owners and builders of their own | Residence Pipe Organs. | HOMEPAGE : | List: | Administration: | | |