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Hi Jay. Looks like it's all coming together.
If this helps. I found that bonding the camera chassis to GND reduced noise significantly, while the TEC was not operating. There was noise in the line plugged into the mains, through the 12V PSU. Noise was also a problem when the MOSFET was switching on and off maintaining temperature during normal operation. Not what I wanted.
The crude solution - I placed a 22uf capacitor across the Gate and Source of the MOSFET, effectively removing voltage spikes caused by the switching. The only effect on the system was to slow down the rate of cooling marginally. Still as quick as an SBIG from what I have seen.
Every now and then a line would appear across an image, not optimal, but stacking software rejected these pixels as outliers - so no problem.
Hope that's useful - depends on your system I guess.
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