My 30mm maglev is super noisy. I have reverted to the 30mm Pi fan(67Ohm) + 33 Ohm resistor. Total cost $1.40 or less.
The KSD9700 look good. You will have to post if you do any experimenting on an appropriate value for On Temp as the outer HS temp will be lower than the inner displayed SOC Temp I guess. Sounds like a better option than a thermistor set up.
The IC buck/boost options are very interesting. Let us know how you get on.
They were probably beyond my needs/wants.
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