I am trying to design a pre-amplifer and just starting basic.
Using a low pass filter and a high pass filter with already determine cut off frequencies.
The problem is that I thought it doesn't matter how you cascade the filters as its super positioned (Both linear), however when I put the LPF then the HPF my cut off frequencies become all whack. When I put the HPF then the LPF it works perfectly, whats going on? I am pretty sure there's something simply I am not taking to account, making the low resistor and cap values to ground.
LPF-> HPF Topology
Any help would be appreciated!