Dear all,
I am trying to design a filter for ultrasonics receiver. My schematics can be downloaded as shown. Before triggering the transducer, I probe the output from the first stage and the noise is nearly 40kHz which is the same as ultrasound. Then, after triggering the transducer, the output from the first stage is shown. Now i face with how to eliminate the 40kHz noise. Any suggustion about how to improve this schematics would be appreciated.
I am trying to design a filter for ultrasonics receiver. My schematics can be downloaded as shown. Before triggering the transducer, I probe the output from the first stage and the noise is nearly 40kHz which is the same as ultrasound. Then, after triggering the transducer, the output from the first stage is shown. Now i face with how to eliminate the 40kHz noise. Any suggustion about how to improve this schematics would be appreciated.