Michael Carter
01-12-2009, 11:57 AM
After getting the backlighting up and running for the control surface position indicator, I removed the instrument and took it back to the bench for a little extra realism.
The two flags for the yaw damper operation are controlled by two tiny electromagnets. They operate on as little as 1.5VDC as proven using a 'C' size dry cell. I didn't have a separate power supply this low, so I used a 3VDC I had laying in the cabinet with all of the other power supplies. I'm not sure what they are rated for, but there is a BIG resistor on the '+' side of each electromagnet. They seem to do OK on 3VDC.
I wired both in parallel and then on to the left yaw damper switch in the overhead. The right switch controls signal to the input card. Gives just a bit more to do and to look at while flying the 727.
Those arrows also respond to both positive and negative voltage, but I don't know how I would incorporate that into the sim. They don't move much even when used, so it's not of major importance for the sim. The yoke movement would have to provide the positive and negative movement, maybe from a center-loaded pot hooked up in parallel with the existing pots. Sort of like a dual-concentric encoder, except center-loaded.
http://i63.photobucket.com/albums/h146/boeing722/727-230005.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230006.jpg
The two knobs ahead of the radar controller are the new HSI controls for course and heading.
The Grimes map light in the eyebrow window is supposed to run on 28VDC but I had it running on 12VDC as the 12VDC buss was more accessable at the time. The light was dim however even with a 12V bulb installed and ended up using a flashlight or the overhead dome light half the time anyway. While I had the engine panel out fuddling with the control surface position indicator, I rewired the map light to the 24VDC buss.
I kept the 12VDC bulb installed. I ran it at full voltage for 30 minutes without it blowing out, so I think the rheostat in the lamp has enough resistance to keep the voltage hovering at around 15-20VDC. The bulb seems to handle it well even though I know it won't last as long as the correct bulb would.
At least I can see the charts now. Though I don't need glasses yet, my eyes aren't as young as they used to be and some charts are more difficult to see and read than others are.
And the red lighting is pretty cool too. :-D
http://i63.photobucket.com/albums/h146/boeing722/727-230003.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230008.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230002.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230007.jpg
The two flags for the yaw damper operation are controlled by two tiny electromagnets. They operate on as little as 1.5VDC as proven using a 'C' size dry cell. I didn't have a separate power supply this low, so I used a 3VDC I had laying in the cabinet with all of the other power supplies. I'm not sure what they are rated for, but there is a BIG resistor on the '+' side of each electromagnet. They seem to do OK on 3VDC.
I wired both in parallel and then on to the left yaw damper switch in the overhead. The right switch controls signal to the input card. Gives just a bit more to do and to look at while flying the 727.
Those arrows also respond to both positive and negative voltage, but I don't know how I would incorporate that into the sim. They don't move much even when used, so it's not of major importance for the sim. The yoke movement would have to provide the positive and negative movement, maybe from a center-loaded pot hooked up in parallel with the existing pots. Sort of like a dual-concentric encoder, except center-loaded.
http://i63.photobucket.com/albums/h146/boeing722/727-230005.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230006.jpg
The two knobs ahead of the radar controller are the new HSI controls for course and heading.
The Grimes map light in the eyebrow window is supposed to run on 28VDC but I had it running on 12VDC as the 12VDC buss was more accessable at the time. The light was dim however even with a 12V bulb installed and ended up using a flashlight or the overhead dome light half the time anyway. While I had the engine panel out fuddling with the control surface position indicator, I rewired the map light to the 24VDC buss.
I kept the 12VDC bulb installed. I ran it at full voltage for 30 minutes without it blowing out, so I think the rheostat in the lamp has enough resistance to keep the voltage hovering at around 15-20VDC. The bulb seems to handle it well even though I know it won't last as long as the correct bulb would.
At least I can see the charts now. Though I don't need glasses yet, my eyes aren't as young as they used to be and some charts are more difficult to see and read than others are.
And the red lighting is pretty cool too. :-D
http://i63.photobucket.com/albums/h146/boeing722/727-230003.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230008.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230002.jpg
http://i63.photobucket.com/albums/h146/boeing722/727-230007.jpg