Learning The Applications And Uses Of Capacitors [My Knowledge]

Hi. Hope you are having a good time. In this post, I am going to talk about the applications of capacitor. This is what I have learned so far and will update this post as I learn new things along the way.

Hopefully, it will add some value to your knowledge and life.

Applications of Capacitor

We know, a capacitor is the widely used passive device in electronics. It is the device you see in every circuit, and you may want to know what job it is doing.

As it plays a lot of key roles in the device you can not say with clear confidence its job without the proper analyses of the circuit.

The following are some of the key applications or roles which this very fundamental device does in a circuit depending upon the application.

1. Storing Energy

The most basic use of a capacitor is what it does i.e. store energy. This finds its applications in devices such as cameras, where energy is temporarily stored and then released.

They can be used for this purpose in car audio systems, uninterrupted power supply (UPS) and other electronic device having a volatile memory. In all these cases, it acts as a temporary battery and provides power where required.

2. Smoothing

Another use of the capacitor is smoothing, which is kind of filtering a signal. This use is derived from the basic use of storing energy.

As I have already mentioned above that capacitors hold charges for a while and provide it when needed. So, in the case of smoothing, the load draws energy from capacitors when required.

As the capacitor has only stored a certain amount of energy, so the amount of energy provided to the load is smoothed. Smoothing finds its applications mostly in power supplies, where AC is smoothed and DC is delivered.

3. Coupling

A capacitor is known to allow AC and block DC signal. So, as a coupler, it allows AC and blocks DC components of any signal coming to it. This effect is called “AC coupling” or “capacitive coupling”. This usage has found its applications in amplifiers e.g. speakers which is an audio amplifier.

4. Decoupling

The word decouple means to separate, disengage, or dissociate. As a decoupler, capacitor breaks signals at nodes so that it is not forwarded to the next circuit.

This is required in cases when some AC signal has some DC bias added to it, or the signal is varying and can be damaging to the components next to it. So, it prevents the signal to be conveyed to those parts of the circuit to avoid any damage. It has found its applications in power supplies as a bypass capacitor.

5. Tuning

For the purpose of tuning, they are used in combination with the inductors to select certain specific frequency components. It has found its applications in radios to tune to a specific channel.

6. Timing

As I have already mentioned above that a capacitor charges and discharges when a signal is applied to it, and it does so at regular intervals. So, it can be used in time-dependent circuits.

The most common example that you can around you is the beeping objects, they are time-dependent because they produce a beep after a certain amount of time.

Another example can be of blinking LED’s or fairy lights that are used for decorative purposes. They also use capacitors to create those blinking modes. The blinking LED on your phones is also an example.

You can find more such examples around you. All you have to do is observe.

Final words on the uses of capacitor in electronics

This is all I want to share about the applications and uses of a capacitor. Hopefully, it has helped you in some way.

You can also check my other post as well:

Thank you and have a good life. If you have any question, comment below without any hesitation. If you like this article, don’t forget to share it your friends and family.




Hi. I am very happy to see you here. I love electronics and having fun with it since childhood, recently earned my degree in Electronics Engineering, and decided to share to the world what I have learned so far. In this blog I share my learnings and try to help you in someway. Hopefully, it will be helpful to you and you will enjoy it.
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