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This is the proposed circuit diagram.
PWM is not available with "Every Circuit" and so I have emulated it with FET gate input voltage at 50% and a corresponding 6v (12v) on the heating side.
Those are the numbers to raise 75mm of Nichrome wire 20C - data from various tables listing the wire properties.
I guess it's time to experiment.
PWM frequency is Arduino native 490hz with a NXP - PSMN1R6-30PL MOSFET to switch the system voltage at the required duty cycle for a given heater temperature. Identical, in principle, to the DSLR Peltier cooling circuit.
Last edited by rcheshire; 01-04-2012 at 09:43 PM.
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