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Old 25th October 2009, 00:06   #1
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Default DIY - Now Add USB Support to your Old Head Unit/Amplifier

Aha, at last adding USB MP3 support to your Beloved OLD car Head Unit seems possible.

I Found a compact sized USB Reader circuit, which has a Sleek IR remote control, Comes with small LED Based Display.(LED Based Seven Segment Display)

I also purchased a IR receiver which was Damn cheap and you can control the played audio.
Total cost f Equip so far. Rs.200/-

Iam trying to Get this installed into my car old HU,
its Sony CDX-F5500x (I know its old unit)

Only problem in this project is my CAR HU doesn't have a Line In, or any other option to
let it use as a amplifier to my D.I.Y. USB KIT.

operated my Sony HU on my table now, to find out any possible pin outs from FM which is going to the amp. stage of the PCB.
let me try before i Blow/throw this.

Enjoy the PICs.
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component side USB MP3 Reader

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7 Segment Display Side

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IR Receiver

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IR Receiver + PCB

DIY - Now Add USB Support to your Old Head Unit/Amplifier-img03840.jpg
Remote and Female USB Pin + PCB
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Old 25th October 2009, 00:10   #2
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Sounds interesting but the low resolution mobile phone pics are a dampener.
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Old 25th October 2009, 00:36   #3
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Interesting ,I will track this thread. Keep us updated with better pics and progress.Thanks for sharing .
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Old 25th October 2009, 01:54   #4
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sorry about the poor quality pic.
don't have the digi cam with me, its with a friend since months will collect soon.

I am about to test this unit tonight
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Old 25th October 2009, 02:26   #5
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Default Nice DIY

Nice DIY attempt there. I'm also looking for same kind of an option as I have Swift zxi with In Dash HU. Let us know about your test results.
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Old 25th October 2009, 02:47   #6
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Results so far with this jugaar PCB

this includes autoscan FM Radio.
this has options to connect to manual controls like
Volume Increase/decrease
Next Track, Prev Track, Stop, Power down, Mode, autoscan
Iam able to listen to USB audio, connected to my home system which is connected to my Computer.

As this unit is 5v powered, I've used computer USB pin out to give it 5volts.

you can see the track number 2 is being played and Pen drive status led is blinking.
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Lastly i think i toasted the IR module, will get a new one, i connected it at a wrong place.

Edit: Currently can't play my home system at good volume, everybody sleeping in home.
will try to listen it on 3500 watts home theater in morning.

Last edited by ghpk : 25th October 2009 at 02:49.
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Old 25th October 2009, 07:29   #7
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This sounds really interesting. Can you share the PCB source and specification.
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Old 25th October 2009, 08:56   #8
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Nice find. do post more information about it. where did you get it from.
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Old 25th October 2009, 10:40   #9
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Keep up the good work friend..Some thing new after many days :-)
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Old 25th October 2009, 14:07   #10
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found it from local electronics market, it has no warranty but works fine.

sounds good with home theater,
still unable to connect it to sony HU as it doesn't have Line In or AUX input.

shreya: nice new avatar
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Old 25th October 2009, 14:16   #11
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Quote:
Originally Posted by ghpk View Post
shreya: nice new avatar
OT:
Yea bro, it looks good na
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Old 25th October 2009, 20:21   #12
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@ghpk-ji, you are holding your phone too close to the subject - it is blurred because of that. Try holding a bit far when taking a pic.

Is there any manufacturer / part number etc. reference on the USB reader?

For your HU, you will have to muster some courage to do some DIY mod. Get hold of the schematic of your HU, and trace out where the mixer / controller IC is. If you can find the data sheet of that IC, you will be able to figure out which channel to put the signal to. If you are lucky, the Line-In channel might be present in the chip but not brought out. Be sure to inject the external signal through a capacitor, instead of directly feeding to the IC. Any external surge and the IC will be toast!
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Old 25th October 2009, 20:30   #13
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gphk, can you post the details of the big IC
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Old 26th October 2009, 01:21   #14
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DerAlte: thanks for the tip, I'll check it out.
I already found the schematic of the HU, and looking into it soon.

greenhorn: Big IC (seems its popular USB host) details are:-
MY Silicon: only name which is shown in chip with some design on"MY"
AU6850B
R1AF60917AR01
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Old 26th October 2009, 14:01   #15
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..or see if there is a macro mode in the phone.

Lets know how you hook it up to the HU- do you plan to disconnect the radio, or figure out if there is a line in without the leads internally?
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