I am looking to build a analog high pass filter with a cutoff frequency of 5.3 kHz. I have found a design which suits my need but I would like to adapt it from the 120V AC, 60Hz and a cutoff frequency of 50kHz it was designed for to the UK 240/230V AC, 50 Hz standard, with a cutoff frequency of 5.3kHz. Any ideas on how to do it to maintain a safe circuit and a good signal ?
I also would like to double check it is safe enough. Should I add a 1:1 transformer to isolate the mains ?
The overall procedure I hope to follow is :
"To measure the EMI on the power line, we used the same hardware used in LightWave . An analog high-pass filter (HPF) with a 3 dB corner frequency of 5.3 kHz is used to reject the strong 60 Hz component. The output of the HPF is sampled at 1 MS/s using a 12-bit analog-to-digital (ADC) converter in the USRP (Universal Software Radio Peripheral) followed by transforming the signal into frequency domain using a 32,768-point fast Fourier transform (FFT), yielding a frequency resolution (or bin size) of 30.5 Hz. The signal from the USRP is then fed into the computer for data analysis. It should be noted that a USRP was used in this prototype simply for convenience." from UTouch Paper
I hope that I didn't say anything too stupid. I'm still a novice, but willing to learn ;)