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Hi, This is a paragraph talk about electronics technology subject:

Please comment for me,

This subject introduces about elctronics component , electronics circuit, analog circuit, digital circuit ... And many technology signal processing.
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I agree that "technologies" is a better choice there.
Comments  
QuangtrungvtvHi, This is a paragraph talk about electronics technology subject:

Please comment for me,

This subject introduces about elctronics component , electronics circuit, analog circuit, digital circuit ... And many technology signal processing.
Hi Trung.

I would say something like this:

This subject introduces electronic components, electronic circuits, analog circuits, digital circuits and many types of signal processing technology.

Introduce does not need a preposition, so we can get rid of about. Usually, electronics is a subject or discipline, but I think it's more appropriate to use the adverb electronic to describe the components and circuits. There isn't really any need for the ellipsis (...). I have also restructured "technology signal processing". I think you mean technologies used to process signals, right?
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Hi,

Why not use "technologies" instead of "technology" when you are referring to multiple technologies?
 BarbaraPA's reply was promoted to an answer.