This filter is current driven and has the formulas given by the two diagram options. The circuit is from an American documentation from the 90s applying to any operational amplifier.
This circuit makes use of a commercial type current transformer. The circuit is from a 2005 Linear...
This circuit provides a linear attenuation of a signal up to 100 dB. The circuit operates with...
The filter shown in the figure can be implemented with general purpose amplifiers like the 741....