Matt circuit

The circuit provides a 10MHz cutoff frequency. Resistor R3 ensures that the input capacitance of the amplifier does not interact with the filter response at the frequency of interest. An equivalent low pass filter is similarly obtained by capacitance and resistance transformation. Wideband Two-Pole High-Pass Filter Schematic

In order to control electrical loads such as heating in the picture below using double pole switch. Double pole switch consists of four terminals. And electric heating load consists of three terminals. In the second switch terminal to get into each phase line (L) and the neutral line (N). While the other two terminals each connected to two terminal heating load. One other terminal on the body burden, directly connected to the grounding line.  a. Electrical circuit drawings double pole switch b. Double pole switch wiring drawings c. Image channel double pole switch