I'm a newbie in electronics and Trying to understand and build this circuit. would somebody tell me the rule of R1 & C2 in this circuit and their magnitude effect on the controlling of the process?why didn't feedback start just after the output of opamp?How could I find the transfer function between the voltage output of Hall effect sensor and the voltage output of MOSFET drain?
The schematic is the circuit of a magnetic levitating tool at:
Thanks so much
