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Question
Sir/madam, please explain what is gyrator ? I am not at all understanding this concept. This concept is there in Wikipedia. But i am unable to understand the content present on the website.  Please explain in brief with simple language.  Thank you for your answer sir/madam.

Answer
Maybe the link here below is too advanced for you but ignoring the complex math you can see the character of the gyrator and some interesting applications of the gyrator circuitry:

http://www-inst.eecs.berkeley.edu/~ee100/fa04/lab/lab10/EE100_Gyrator_Guide.pdf

I like this explanation and examples also, please look through it:

http://mysite.du.edu/~etuttle/electron/elect66.htm

In electronics there are just a few basic electrical elements that make up nearly all the working components of an electrical or electronic circuit: resistors, capacitors, inductors and transformers.  You might find others.  The gyrator is an electronic circuit that can be adjusted in its operation to have voltage/current characteristics that change based on its controlling input. So, it can be made to look as though it behaves like a capacitor or, with voltage input change, can be turned into what looks like an inductor; or back to a resistor.

It is a bit of electronic wizardry.  But, is useful in complex circuits where we wish to alter the characteristics of a circuit by external control.  

Here is an interesting example.  Large inductors are big, bulky and expensive.  In this example the gyrator circuit is designed to have the characteristics of a large inductor:

http://www.epanorama.net/documents/telecom/gyrator.html

As you can read from the above link the value of inductance the circuit will simulate is approximately the value of 1 henry for every 2 microfarads in C2. So if you want to make 5 henry coil simulator, you just use 10 uF electrolytic capacitor.  Thus a capacitor, transistor and a few resistors in a simple circuit can have the electrical characteristics of a coil/inductor.  Very interesting.

Does this help?  Until you get more learned in electronic ac circuit theory it may not make you aware of the magic that a gyrator circuit can produce.

Hope this helps you understand it better.  

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Electronics questions about AC, DC and digital theory.

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Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)

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IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member

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BSEE University of North Dakota

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