![]() ![]() The formula for calculating the cut-off frequency is : ![]() ![]() So how does it work? As we know capacitor is a device that stores and release energy the concept that this filter works is that because of resistor and capacitor arrangement in this case low-pass filter resistor is connected in series with capacitor, as the frequency changes there is an effect to the capacitor the higher the frequency capacitor acts like a short circuit that cause this frequencies to be attenuated to the ground (since the end of the capacitor is connected to ground)the frequency that they are going to filter depends in the values of capacitor and resistor we call this cut-off frequency in low-pass filter frequencies below it will be allow to pass and above it will be attenuated. What is a Filter?įrom the word itself filter means to remove or to filter something, In electronics it is just the same it’s just that we are dealing with signals, for newbie in engineering signals means that you are dealing with frequencies, which is a very important thing because almost everything is resonating at a certain frequency.įilter composed of resistors and capacitors depending on the design this could be cascaded or just a single stage filter in this topic we are just going to use a single stage low-pass filter. In this tutorial before we are going to do the steps in constructing the Sallen key low-pass Filter let us first define what filter is and how it works. One of the most common application of this circuit is that when you have a certain signal that you want to receive without receiving other signals that are considered interferences around your receiver, this circuit can do the job and the concept is basically similar as the radio receiver the difference is that in radio receiver you can adjust or select the frequency that want by just turning the variable capacitor. In Electronics communication where it involves a great number of signal applications, filter plays a very important role in it, this experiment that I had done which is a Sallen key low-pass filter is one of it. Basic skills in constructing Electronics circuit.Actual design and construction of a VCVS Low-Pass Filter. ![]()
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