L'orgue Automatique

This blog shows the progress day after day of a midi organ building. Midi organ is a barrel organ without cardboard or paper roll, just driven by a computer. It can be virtually as small as a busker and as big as a church organ. When you begin the construction you are are not sure of what size it will be! First time visit, click on archives to see the beginning of this adventure. You can click on pictures to enlarge. All comments are welcome.

Monday, May 22, 2006

ULN 2803A

These are the responsibles of troubles! . I ordered 8 ULN 2803A chips today, it's not very expansive, 0.70 euros each. I think receive the news soon!
Many thanks to friends for having help me! Hope is coming back!
To prevent other troubles, I'm advised to add diodes between solenoïds wires, but as you can see on the picture, they are all soldered and insulated, how can I do?
3rd picture: By the small window in the bellow, it is possible to repair the bad valves easely.