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Steve. Fantastic. That is very similar to a project I have in mind. I can't fit resistors in the space and plan on glueing Nichrome wire to aluminium tape and sticking that to the glass, then covering with black tape.
I will PWM a MOSFET with a microcontroller to keep the glass 2C above dewpoint. I need to be careful with heating so as not to fracture the glass. What is the thickness of your filters?
Many thanks
Rowland.
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