Hi,
Electronics-tutorials has a nice write up on passive LOW pass filters. Within that it shows how the corner frequency changes between a 1st and 2nd order.
But I'm interested in passive HIGH pass filters. Same website has a similar article, but it doesn't have a corresponding formula for frequency difference between 1st and 2nd order. I don't think it can be the same formula. With LOW pass the 2nd order cut is lower than 1st order, sharper. But it should be the opposite with HIGH pass... the 2nd order cut should be higher than 1st, right? Maybe just invert the formula?
Electronics-tutorials has a nice write up on passive LOW pass filters. Within that it shows how the corner frequency changes between a 1st and 2nd order.
But I'm interested in passive HIGH pass filters. Same website has a similar article, but it doesn't have a corresponding formula for frequency difference between 1st and 2nd order. I don't think it can be the same formula. With LOW pass the 2nd order cut is lower than 1st order, sharper. But it should be the opposite with HIGH pass... the 2nd order cut should be higher than 1st, right? Maybe just invert the formula?