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PSU to Car Radio (Updated with Lots of Pics)

post #1 of 20
Thread Starter 
Like the title says. I am bored and want to do this with my equipment. First I need to know if you can hook up two power supplies together to power a car radio. I have an old Compaq psu and an old Dell psu. If I take a 12V wire from each and connect it to my radio 12V supply, will it be detrimental to my goal or am I off to a good start?

Thanks guys.
Edited by Rajb1031 - 2/9/10 at 11:30pm
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Murdah On E
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post #2 of 20
Yeah, knock it out
    
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post #3 of 20
You shouldn´t need 2 PSU´s. I used to run a car radio on a Scalextric 12v transformer.
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SoulStorm Brew
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post #4 of 20
I have an Xbox 360 PSU powering a small 240 watt car amplifier. It will work as long as there is enough amperage. The 360 power supply puts out around 16 amps.
post #5 of 20
Thread Starter 
Quote:
Originally Posted by RonindeBeatrice View Post
Yeah, knock it out
Will do, Ill post a picture log later.

Quote:
Originally Posted by mr soft View Post
You shouldn´t need 2 PSU´s. I used to run a car radio on a Scalextric 12v transformer.
Say if I wanted to also hook up my EQ to it? One should still suffice right?

Quote:
Originally Posted by GuilT1 View Post
I have an Xbox 360 PSU powering a small 240 watt car amplifier. It will work as long as there is enough amperage. The 360 power supply puts out around 16 amps.
I have to check the Amperage on the PSU'sI have. I'll be back later.

Thanks you guys. Rep given.
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post #6 of 20
Heck I use a computer power supply to run my Ham and CB radio in the house!

    
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post #7 of 20
I once used a 3 amp AC to DC converter to build a jobsite radio. Had a 4x45 watt cd player hooked to two 6x9's and two 5 1/4's. Now granted if I turnedbass boost on and cranked the volume the screen would DIM badly and sometimes would shut off. But mind you it was running off of 3 amps. Most car CD players run in the range of 7-8 amps max load.
post #8 of 20
Thread Starter 
So I have finally finished. This was a pretty straight forward project and a good way to kill about an hour and a half and two beers. Once again, the aim of this was to power a car radio off of a Power Supply Unit and have it connected to my computer for music purposes.

Now the first thing I did was to lay out all my parts and come up with a plan. I had my SONY - CDX-F7715X radio which I took out of my broken car (), wires, and two old Radio Shack speakers from an old PA system. You'll see that there are 6.5" speakers in the boxes. That is because both tweeters blew and I had these lying around so two months ago, I changed them. Pictures were taken with my AT&T Tilt 2 phone so sorry for the bad quality.


The PSU came from this computer which I can't remember how old it is and it's total power output is 250 Watts.



Next on the list was to decide which wires from the PSU I was going to use. Only two were necessary. One yellow for +12V and a black wire for ground. I decided to take it from the end of the molex chain for no apparent reason.



After I took it out, I figured it would be a good idea to see if it would still work. I jumped the green wire to a black wire with a paperclip and lo and behold the fan started spinning.


Finished with the PSU for now, I turned my attention to my old wire harness for the radio. When I took it out from my car a while back, I basically went RAMBO with the snips so I tried to clean it up a bit and expose which wires I needed to use.
On the harness for this radio, there are a total of 15 wires.
Red - 12V Power
Yellow - Ignition
Black - Ground
Orange/White - Dimmer
Blue - Antenna Remote
Light Blue - Amplifier Remote
Blue/White - Antenna Remote
Grey and Grey/Black - Right Front Speaker
Purple and Purple/Black - Right Rear Speaker
Green and Green/Black - Left Rear Speaker
White and White/Black - Left Front Speaker
The other harness that was hooked up was for connections to the stock speaker system in my car. By the way, it was a 1999 Nissan Sentra GXE, Limited Edition.



I wrapped up all the remote wires for not because I am not hooking up any amplifiers soon and I wrapped up the rear speaker wires because I figured I wouldn't need them... or so I thought...

After I stripped the harness, I stripped the speaker wires.


Seeing that I want to use this to play music from my comp, I dug up an old two to one wire and rammed that into my computer and the other end into the aux input on the back of the radio.




After all that, it now came down to a matter of connecting and black taping. This was the part where the most beer was comsumed as it was very tedious. The Yellow and Red wire from the harness was connected to the Yellow to the PSU because The ignition wire and power both require 12 Volts. The black on the harness was connected to the black on the PSU also so power was now taken care of. Next up can the speaker connections which were pretty straight forward. If you attempt this, just make sure you don't get any wires crossed as it could lead to a short.




I would call this part of the build the start of the fourth quarter. After hooking up the speakers, I turned the system on and it worked without a flaw. Except that the Radio Shack speakers weren't producing high frequencies. This was annoying because listening to Classical Trinidad Tan Music would sould like crap if the dhantal was missing.To solve this, I decided to hook up my two Soundstream SST-05 tweeters to the rear speaker connections of the radio. This made a huge difference.



After these were put in, I put the harness back in the radio, jump started the PSU and started playing music. Only ting is, there is no switch on the PSU so keeping the paper clip in leaves it on and taking the clip out, turns eveything off. Thats easily fiaxble with a simple switch though. I didn't feel like putting one in. To me, it sounded decent for a ghetto-rigged mod. If someone wants to do this in the future, don't hesitate. It is very easy and makes you look cool to have a working car radio sitting on your desk


Edited by Rajb1031 - 2/9/10 at 11:28pm
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Murdah On E
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post #9 of 20
Keep in mind, if they're low-quality PSUs you may want to put a few 5V fans or some resistors across some +5V and +3.3V lines to help alleviate the crossloading. Having nothing but +12V load on a PSU can cause bad voltage instability and ripple, which can damage capacitors and other electrical parts over time. Having just a couple of amps on the +5V and +3.3V can help with a small PSU, though for larger PSUs you need more amperage.
post #10 of 20
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
Keep in mind, if they're low-quality PSUs you may want to put a few 5V fans or some resistors across some +5V and +3.3V lines to help alleviate the crossloading. Having nothing but +12V load on a PSU can cause bad voltage instability and ripple, which can damage capacitors and other electrical parts over time. Having just a couple of amps on the +5V and +3.3V can help with a small PSU, though for larger PSUs you need more amperage.
I'm sure this is a low quality PSU so I will look into doing that. How many fans do you suggest? I could use one and keep it on top of my radio.
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Murdah On E
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