Jester
Full Member level 6
I'm working on an audio circuit that will run from a 9V battery and requires a high pass filter, to reduce 50-60Hz noise/hum. The pass band is specified as 180Hz to 2400Hz. The present design has a 2nd order filter and the hum is unacceptably high.
I hope to use one capacitor value in this filter to reduce cost, does this look like a reasonable capacitor for this application? https://www.digikey.ca/product-detail/en/GRM3195C1H273JA01D/490-1762-1-ND/587544
Below is the proposed filter circuit, does this look reasonable? or are there obvious improvements that can be made?
Present design uses a LM833. Is this a good choice and if not suggestions for a more suitable op amp?
I will use a switched cap low pass filter following this stage to reduce noise beyond the 2400Hz cut-off.
I hope to use one capacitor value in this filter to reduce cost, does this look like a reasonable capacitor for this application? https://www.digikey.ca/product-detail/en/GRM3195C1H273JA01D/490-1762-1-ND/587544
Below is the proposed filter circuit, does this look reasonable? or are there obvious improvements that can be made?
Present design uses a LM833. Is this a good choice and if not suggestions for a more suitable op amp?
I will use a switched cap low pass filter following this stage to reduce noise beyond the 2400Hz cut-off.