Apart the Audio Panel I also recently received two real Davtron M877 clocks. Obviously Ebay has been my source for them. I bought earlier a first one that turned out to have a dead digit, so I decided to also get the second one from the very same seller to get replacement parts for and make at least one completely working. The price was just right (less then 70$ each) while a single replacement digit costs as much as 45$ and the second out turned out to be fully functional so I hadn’t either to mess with it.

While the Learjet45 has a Davtron M850 it seems that it is just the same as M877 but with a custom faceplate. The overall look indeed is the same, but an M850 might cost even 300$+ and it’s not worth in my opinion for a simulation purpose. The back of the clock exposes a 9 pin D-Sub connector. It wasn’t hard to find on the Davtron’s site the datasheet for the part and the wiring, so I successfully lighted it through 12V DC (though the manual says it needs something between 14-28V DC). Backlighting is 5V driven but I’ll make some mods to it to add a customized front plate similar to the needed M850. What’s nice for the project is not just having this real part but the fact that the clock can be started by closing a contact on one of the D-Sub pins. This way I’ll be able to control flight time start-stop from an FSUIPC offset and my own interfacing board.

written by l45 captain \\ tags: 850, 877, chronometer, clock, davtron, FSX, learjet, learjet 45, m850, m877, simulator