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Ultrasonic_filter

2017-02-23 07:53  
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Ultrasonic_filter
This circuit shows both sections of an LM833 that is connected as a filter to reject undesired ultrasonic signals. The filter characteristic is 4th-order Bessel with the -3-dB frequency at about 40 kHz. Resistors and capacitors should be 1%-tolerance components. This circuit can be cascaded with that of Fig. 7-43 (with the low-pass preceding the high-pass) to produce a response such as shown in Fig. 7-44B. National Semiconductor, Linear Applications Handbook, 1991, p. 944,945.