Joop van der Velden
- Jan 1, 1970
Dana said:Looking to notch out a 400HZ whine from some audio circuits connecting
remote manned sites to a central location.
The audio is microwaved from remote location to the central location.
Would like to know the formula for determing the resistor and capacitor
The overall bandpass is 300HZ to 3KHZ.
Or would it be better to just use an High Pass filter.
There is a chance that filtering the 400Hz tone will not be sufficient,
and that there are several harmonics present in the audio signal (800,
Find this out first, by comparing the hum you hear with a clean sine
wave of 400Hz. http://members.lycos.nl/audiofriends/testsignalen/