Hi Chris,
Finally reporting back in with the field test of the controller.
The temps at Leyburn were -2 degrees and there was a thick frost on the ground in the morning. The controller was covered in frost where I had it mounted on top of the optical tube. The temperature sensor was a snug fit into one of the collimation bolt holes on the lens cell. The front objective was clear of dew all night. On the occasions I checked the screen, it was running the heater at ~40% to maintain the lens cell 2-3 degrees above the dew point calculated by the unit. I had the dew strap wrapped around the outside of the dew shield - there’s a 1cm gap between the dew shield and lens cell, but it still worked fine.
I highly recommend this unit to others. I'm going to build another unit for a mate with a 14inch OTA - hopefully the mofset plus heatsink will cope with the higher amperage. Better do some calculations.
Thanks again for publishing this design.
DT
Last edited by DavidTrap; 05-07-2016 at 08:02 PM.
Reason: added a bit
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