Make It Simple

Now, it's time to explore the workings of the filter circuits. I have been thinking about where to start for too long. But we have to start it anyway; that's what matters. So the filter circuit is basically a voltage divider circuit. In case of resistance, based on the resistance value, the voltage gets divided, and we get the voltage across the resistance. In the above example, a 12V 10Hz AC signal drops to a 6V AC signal across the resistor R2, which obeys Ohm's law. Simple. In the case of a capacitor, the capacitive reactance depends on the frequency of the signals. Means that capacitive reactance increases with a decrease in frequency. The equation for the RC low-pass filter is given in the image below.  Let's try to calculate the output voltage. For the above circuit, we are getting an output voltage of around 6.22V across the capacitor for the 2 kHz signal. Let's try to simulate the same, and let's see the result. Let's play with different frequency va...

Understanding how filter circuits work is an important topic in electronics. It serves as a very important piece of the puzzle.  Wherever we go, whatever we do, everywhere we come across one thing for sure. Noise, noise, noise, noise, noise...  Yes, in real life, I have no idea of how to deal with this noise other than trying to ignore it. That also try only. But in electronics, that's not the case. We can eliminate the noise or control it however we want using this filter circuits. One thing I like very much in electronics is that we can control the outcome as much as possible based on whatever we want. Coming back to the topic. Filters play a major role in analog circuits, not only in that even in power circuits, we will use filter circuits to eliminate ripples. Its having a wide range of applications. Basically is we use it to eliminate the unwanted signal or amplitude in our desired signals. In one word, eliminate the NOISE. So, to understand the working of filters, one mu...