Power OpAmps application

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RITESH KAKKAR said:
Hello,
Can you tell more how it work and why AC was used here to drive?
why coaxial wire are used with leds?
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AC is used to modulate the signal since you can't send any information with a DC signal.
You vary the brightness of the LED is response to the signal input and then use a light detector diode to recover the signal.

The example of a coaxial line is a completely separate application from the LED application.
 

AC is used to modulate the signal since you can't send any information with a DC signal.
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Hello,
I have studied communication in which the signal of low frequency is modulated with high freq signal i.e. carrier signal so, there is PCM,PWM, PLL
so, you mean AC is used to modulate how we do it?
and why we use Cos wave for this purpose and how we demodulate the information we want to send and receive?
 

You can modulate the high frequency carrier with AM (amplitude modulation), FM (frequency modulation) or a few other ways like PWM, look in Google.
An AM demodulator is usually just a diode and capacitor to detect half of the envelope. There are a few ways to detect FM, look in Google.

Does your government block you from looking at Google on the internet? Then why don't you look there at the thousands of explanations and tutorials.
Why aren't you learning about these basics of electronics in school??
 

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