Putput

Hello busheyguy, look here and search for this article number: 378652. I didn't find a prepared lead, you'll have to make a DIY one but it's no so difficult. Special tools are preferable but not necessary, with a simple pair of pincers and some patience you can fit the wires to the ISO connector. There's an even simpler solution for the jack-part. I bought a prepared 3.5mm jack extension cable, cut off the female connector and applied the ISO connector to this end, easy. BUT BE CAREFULL, the AUX input is very sensitive to high voltages (static electricity)

I know because I blew up the AUX input of my first HU. (And managed to get a new one from my cardealer under warranty)

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busheyguy

That's great. I have placed my order. Many thanks. What is the best way to avoid static electricity?

SpikeDus

Are you sure?
The layout of the pins look EXACTLY like the picture on his website: it has 2 mini-ISO sockets on top.


As opposed to the picture in this thread. This picture shows 3 mini-ISO sockets on top (C-section). Judging from this picture there is a fuse as well (10 A). My HU doesn't have the fuse either.



Thanks for the tip!

Vicne

Here is a page showing precisely the connectors on Tuner List and Update List models.
Note that although these pictures come from digital models, as far as I know there is no visual difference between a blue connector with analog or with digital connections...

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Vicne
SPDIF CarPC V2 - Tuner List CD Changer Emulator - Chris Conty

Putput

The most important thing is that you have to make sure that everything is grounded before you connect it, including you. You don't have to stick a wire were the sun doesn't shine but it helps . (Sorry, bad joke) Try to connect your audio device to the ground of your car (- minus) before connecting the input. That should do the trick, and of course do not touch the mini-jack connecter with your hands when the ISO connector is plugged into the HU.

Good Luck!

Graf

is it possible to use this version of interface

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Graf

Anybody succeded to emulate CD changer on above mentioned Head unit ?

pippolippi

It's missing the pull-up resistor on the left side transistor. See message 442 for a working circuit (at least it worked when I last tried it, unfortunately I hadn't time to play with it lately and I won't either in the coming months).

Graf

Is it enough to put 12 V permanent voltage on HU REMOTE
through resistor ( problem is that my unit does not have HU REMOTE signal)

Thanks for help pippolippi

pippolippi

Yes, the HU REMOTE was an easy way to obtain 12v for the pull-up

So I wonder if it is compatible (both electrical and protocol wise) with the tuner list unit. Google tells me it's a philips unit, so it's possible that uses a completely different interface.

Graf

i have been searching also and it says thar it is compatible with vdo dayton cd changers which i have found that they are compatible with tuner and update list HU. it does not have spdif but analog audio input which is i thing advantage. from the electrical point of view i expect compatibility in level of signals otherwise it will not vdo cd changers will not be compatible with tuner list and update list, but for protocol it is only possible to try and see what happens.

i am preparing to try first with pc version of emulator and if succesful i am planning to meke PIC version.

actualy i am planning to install DWW-700M vga monitor with built un TV tuner
and later PC with GPS mapping software and i need an audio entry to existing HU.

I was also thinking to enter with the audio signal somewhere behind magnetic tape head reader (it is cassete player with cd changer control), but i think approach with simulation of cd changer is much more elegant way.

Just one more question. Are the signal ground for D2B and common car ground connected together or not.

I have also found some of yours schematics and would like to hear your comments which one is realy final and which one works best

Thanks

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Graf

has anybody already made a pc version emulator of head unit

it may be useful to test the cd changer emulator just by

connecting software emulators on different com ports

and test PCB boards without taking all the stuff in to the car & back

Arien

Can anybody tell me wich kind of relay switches must I use to switch between CD Charger and PC??

I'm trying to mount this circuit, but relays are not documented.

Thanks in advance!

Vicne

I just replied to your PM :-). But it can be of interest to everyone indeed :

You're right. I should be more precise.

For relays, I used 2 small DPDT (bipolar bi-directional) 12V relays such as [http://www.velleman.be/be/en/product...id=17785]these ones[/url].

And indeed transistors are standard bc337 ones.

For debugging purpose, maybe you can start on a breadboard with only the main "level adaptation" part (central part with the opto-coupler) and once it works, you can go on with the relay switching part...

Please don't hesitate to share your experience here - good or bad - and please specify your car and HU model if possible.

Good luck ! =-)

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Vicne
SPDIF CarPC V2 - Tuner List CD Changer Emulator - Chris Conty

Vicne

It's more universal indeed, even though quality can be a bit less than pure digital... Anyway, you don't have any choice

Agreed.

I wouldn't assume that. If you can, opto isolation is always safer I think.

Well, all are somewhat final at a certain point
As I said above, I strongly advise using an opto-isolated one though my early developments were made without it.
I'm personally using the last one ("Full version") on this page and it works pretty well, but the second one ("Opto-isolated version") should work perfectly if you don't need relay switching with an actual CDC.

Please tell us the results of your experience, we're very interested...

Good luck

__________________
Vicne
SPDIF CarPC V2 - Tuner List CD Changer Emulator - Chris Conty

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