Dew...what dew...6 independent channel PWM controller
. That said IMHO PWM dew control is expedient but not the best method. This I have been pondering somewhat but am yet to find a better answer
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I also like the OEM dew heater thin film heater straps like Kendrick. dew not dew etc. They work nicely buy distributing heat evenly and last a long time. In the interim just use a hair dryer as required...if you have 240V present. You can get +12V hair dryers but all this is a temporary fix.