How they can build this part? Can anyone explain to me clearly?

http://www.mp3car.com/forum/mp3car-technic...-car-stereo-amp

https://www.youtube.com/watch?v=DUR0JpZh6zw

Your PC sound goes through PC speakers that has built-in amplifier.

This is using car amplifier + speaker to replace your PC speakers. The other one is using car head unit built-in amplifier + speakers to replace the PC speakers.

I don't see anything special here from my understanding

start with, what do you have in hand?
receiver? amp?

I have a car stereo. Interesting to connect car stereo to pc. Don't know how they can connect their car stereo to pc. What should i have such as cable to connect car stereo to pc?

I see. I just want to connect car stereo to pc. So i can play radio or song on my pc.

It would be cheaper and easier to just buy a FM radio instead.

But i really excited put the car stereo to pc such as pioneer, kenwood, jvc. U know what i mean?

Should be easy then as the PC power supply can handle 12V required by the head unit. Ensure u the red and black wire goes to the 12V rail and yellow wire goes to a backup battery to retain the memory function.

Try to understand. Need some the wire structure. image. maybe. hmmm

Why would one connect car stereo to PC. The article is about using car amp or car stereo as amp to amplify PC sound.

Car stereo has built-in amplifier already. Why need to connect to PC? I'm getting confused

If you want to play radio or song, you need to use the RCA output from the car stereo and you need an adapter to connect to the PC input because it has different type of connector. Remember that the RCA output from car stereo is Line Level signal. So, connect to the Line Level input of the PC

Do you know what car stereo adapter to connect to pc? Some picture please.

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How to power on car stereo into pc or need to modified the power supply? What shoud i do?

So, the picture is the back of your car stereo, I presumed. Looks like it has RCA connector (colored White and Red). This is the Line Out signal level. As you probably know:
White -- Left audio signal
Red -- Right audio signal

You just need to connect this signal to PC input (Line level input). You do not connect the wire that normally connect to the speaker because it is an amplified audio signal. It will fry your PC audio input.

So, just get the adapter wire (very common) to connect from the car stereo RCA Line Out signal to the PC Line In signal which is normally Blue in color. Refer to the link below:
http://manual.audacityteam.org/man/how_to_..._equipment.html

The power for the car stereo is, as you know, require 12V. This is available in PC because PC has 5V, 12V power rail. The main power to hardisk or CD ROM is 12V. tap it from there. You probably need PC Y power cable to split the 12V line from PC. Refer your car stereo manual for power connection.

Good luck.

So i just need this cable and modified to get power on right?

I believe so. Power to the car stereo is just 12V and GND. You can easily tap the 12V and GND from PC.

I see. Hope it have a specific cable in market to connect from car stereo cable to power supply. Otherwise need to modified that cable.

btw thank you explain to me the detail.

The car stereo comes with its connector and on the other end just tinned exposed wire. You can easily buy the mating connector to plug to the PC power connector. It is more common than the car connector side.

You probably need crimping tool to make proper connector or just solder it (a bit soldering skill needed).

I'll take the challenge.