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Old 08-12-2011, 12:53 PM   #1 (permalink)
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Car Stereo

This is for an RV but the radio setup is identical to a car.

The car speakers connect to the car stereo that is powered by the car battery.

I want to be able to power the car stereo from AC power (standard wall outlet). If that is not easy then I would like to easily get access to the car speakers.

Any suggestions? Also, I don't know how I would get to the back of the car stereo. I know there are special tools to pull it out but if you don't have those then what do you do?

Thanks.
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Old 08-13-2011, 10:31 PM   #2 (permalink)
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Re: Car Stereo

Kong, what you are thinking of doing is impossible without purchasing lots of gadgets, and the installation would be very ugly as running a car stereo off of a standard 120VAC line is extremely unusual.
{but I understand that you want to be able to listen to music without killing the battery or having to run the engine.}

DC power supplies like those made for PC's do give the required 12VDC, but at very low Amps, insufficient to run even a stock stereo in my opinion.
The current is always the party pooper, always.

Let me go think about this some more.
Do you have a deadline for the project?

---------- Post added at 09:31 PM ---------- Previous post was at 08:52 PM ----------

^
What I was saying up there is based on the assumption that you wanted an in - dash installation where only a male plug is hanging down under the dash or perhaps out of the front grille.
{like a block heater}

But I'm jumpin' the gun here because I don't even know exactly what you have in mind; please let us know.

Last edited by RU Joe; 08-13-2011 at 10:47 PM.. Reason: Bad idea omitted.
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Old 08-14-2011, 01:07 PM   #3 (permalink)
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Re: Car Stereo

I want to run my laptop through the car speakers. The speakers require an amp so that means the car radio has to be a middle man. I don't want to use the car battery.

1. To get my laptop signal to the radio I plan to use a fm transmitter. I know how to do this.
2. To power the radio off of AC I plan to use a AC wall wart that powers a car cigarette lighter. I'm not sure if it will work, but I know how.
3. To do that I need to get behind the car radio so I can access the wires.

So really my main question is how do you remove a car radio.
Or alternatively is there a device that allows you to take the wires connecting to the car battery and power them from AC.
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Old 08-14-2011, 06:18 PM   #4 (permalink)
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Re: Car Stereo

Kong:
Quote:
So really my main question is how do you remove a car radio.
The procedure will vary from vehicle to vehicle; some you can just undo a few screws or nuts, others require removing large sections of the dash and/or shift assembly.

If you still want to go ahead with the project, there are some videos on youtube showing how to hook up PC power supplies to a car stereo - apparently the current is sufficient for basic operation {who knew?}
This one isn't too bad:

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Old 08-15-2011, 11:59 PM   #5 (permalink)
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Re: Car Stereo

Good to know about the PC power. I have plenty of those laying around.

I decided to first see if the RV AC power is charging the batteries. I don't know if they are or not but so far the battery is still strong.

If the battery is not being charged then I am going to look into either a solar or AC battery trickle charger. And just run the radio from the battery. That way I don't have to figure out how to get behind the radio to the wires.

Thanks for the help.
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Old 08-16-2011, 12:41 AM   #6 (permalink)
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Re: Car Stereo

Quote:
Originally Posted by Kong View Post
Good to know about the PC power. I have plenty of those laying around.

I decided to first see if the RV AC power is charging the batteries. I don't know if they are or not but so far the battery is still strong.

If the battery is not being charged then I am going to look into either a solar or AC battery trickle charger. And just run the radio from the battery. That way I don't have to figure out how to get behind the radio to the wires.

Thanks for the help.
I wish I could be of more help than that; it's been years since I've even opened anything up and I'm getting rusty.

ON your idea of hooking up a charger, please be careful if you go that way because car batteries are extremely dangerous and you must always assume they could explode at any time - especially when a charger is hooked up to them because of the gasses formed inside during the charging process.
Because of this, I omitted that idea from my previous post.

Do the PC power supply conversion instead - it seems to be a far safer alternative and the worst that could happen is it will burn out.
Test the output with a meter first, before hooking it up to the stereo.
If you're using large speakers or a sub you may consider using a capacitor to augment the LF current draw.

NOW the only problem is to get into the dash, eh?
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