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That might be a good starting point - drop the 12v down to 5v and feed that into some sort of controller / PWM circuit before sending that out to the heater straps...
I was hoping not to have to design anything as I haven't touched circuit design and the like since I was at Uni (sometime last century). (I'm OK with assembling something, as I can drive a soldering iron and follow instructions.)
Cheers,
V.
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