I spent a few hours today searching for a notch or band reject filter this morning. I ended up finding an awesome resource for Texas Instruments, it’s a datasheet that basically spells out circuits and formulae for all basic active filters:
- Notch Filter ( 60 hz filter, 50 hz filter, buzz or hum filter )
- Band Pass Filter
- Band Reject Filter
- High Pass Filter
- Low Pass FIlter
- etc