carpenter
Full Member level 6
On line, we have 230V 50Hz and sometimes control frequency 180Hz, the controll signal is 100 weaker.
I need to evaluate the presence of the control frequency. I use MCU and Goertzel algorithm, its work, but sometimes there is a problem and it would be convenient to suppress 50Hz with an analog filter .
I designed a filter that suppresses 50Hz against 180Hz by -60dB.
That's the theory. SMD ceramic capacitor have manufacturing tolerance and temperature and time changes.
I don't need -60db just me i -30dB.
The question is whether such a thing will work in reality and will be usable in the long term?
I need to evaluate the presence of the control frequency. I use MCU and Goertzel algorithm, its work, but sometimes there is a problem and it would be convenient to suppress 50Hz with an analog filter .
I designed a filter that suppresses 50Hz against 180Hz by -60dB.
That's the theory. SMD ceramic capacitor have manufacturing tolerance and temperature and time changes.
I don't need -60db just me i -30dB.
The question is whether such a thing will work in reality and will be usable in the long term?