Passive Low Pass Filter. The simplest approach to build a filter is with passive components resistors capacitors and inductors. A low pass filter circuit which is designed by passive components is referred as passive low pass filter.
The following image shows a simple circuit of rc low pass filter is shown below. This instructable is intended to show you how to make several different filter circuits in particular low pass and high pass filters along with a discussion of notch trap filters and bandpass filters. In the r f range it works quite well but with the lower frequencies inductors create problems.
The gain of a passive low pass filter is always less than or equal to 1.
The following image shows a simple circuit of rc low pass filter is shown below. Simply by connecting resistor r in series with a capacitor c gives rc low pass filter. In other words we need a circuit that consists of a resistor and either a capacitor or an inductor. The exact frequency response of the filter depends on the filter design the filter is sometimes called a high cut filter or treble cut filter in audio applications.
