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Hi Brendan,
The design looks great but had a few questions with the basics.
With PWM, aren't you basically raising one terminal of the dew strap to +12 and then to zero with the FET? Not sure how the outer sheath can become +ve if the core is the terminal being raised high and outer sheath is connected to ground, won't that stay at ground?
FET's and transistors aren't my strong suit so pls pardon the ignorance.
Secondly, can't a single microcontroller be used if all that's needed is a TTL/CMOS high/low at the gate of the FET?
with an mcu, you can easily get 4 or more independent channels without actual pwm by just changing the interval between high and low pulses with the pot using ADC.
hikerbob's thread had a simple circuit with an 08m picaxe driving an FET. so can't that be extended to 4 or more channels?
what is the max voltage to be applied to the FET?
thanks
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