This traditional configuration of bandpass or bandpass filter with operational 741 was found in a 1976 documentation. The circuit is tuned to a frequency of 1 kHz and must be powered by voltages between 6 and 12 V. The consumption is very low, of the order 3 mA. See in the math section for electronics on the author's website how to calculate the double T components for other frequencies. Remember that the maximum frequency of the 741 for this application is around 100 kHz.
