@crutschow Doing some research I found the circuit attached below. I was thinking that I only need 1 mA of test current so I may get away without the amplifier. What do you think of this circuit? C8 is the coupling cap, and L3 limits the current provided that it has higher impedance than the test winding. Note the LPF is not present at the amplifier input. Could I ensure the 1 mA/60Hz regardless of the load if I connect it directly from the micro port? And another question is, should I use a 60Hz square-wave or variably duty cycle pwm from the micro?
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