Yet another AUX-In mod for the 6-cd-changer, no blank disc... gone digital...

So it's not completely done, but i'm using a J-K Flipflop, and some JFET's to manage the signals...

here are some pics of the process.... no circuit board.. i'm just going to epoxy it into a film canister

Getting there....

http://legacygt.com/forums/vbpgimage.php?do=full&p=2300&d=1163973283

 

just need some resistors...

http://legacygt.com/forums/vbpgimage.php?do=full&p=2301&d=1163973289

 

Of course, i'll post the scematic later if anyone want sto do the same...

pretty much i'm going to tap the SAT button, and cut into the radio circuit board.

Very interesting - I'd love to see the schematic...

 

-Ryan

It should say, "gone solid state", not digital. You're still swapping analog signals in the same way as the relay mod does. FWIW - I think this is the way it should have been done from the beginning though. If you're going to cut traces and solder parts onto the main board, you shouldn't get audio "thumps." Nice work!

Well.. yeah not digital, i just couldn't remember 'TTL'

i'm going to switch over to cmos if i can find some chips around the house

Hey I'm in the process of upgrading the audio in my spec.B and would love to integrate a sat or an ipod. Can't wait till your finished.

So i got it all wired up & switching... then i pluged in my headphones.... turns out that JFET's don't handle audio very well... meaning it doesn't 100% kill out the signal.

So i did some searching, found and found a Triple SPDT High-Speed, Low-Voltage, 1 ohm CMOS Analog Switch... i get 25 'free-samples'... 11 bucks shipping, not too shabby.

should be in the mail tomorrow.....

so to update my design here, the flipflop is being used like a latching relay, to control the audio switch, which obviously switches the audio signals, crisply.

So i got it all wired up & switching... then i pluged in my headphones.... turns out that JFET's don't handle audio very well... meaning it doesn't 100% kill out the signal.

So i did some searching, found and found a Triple SPDT High-Speed, Low-Voltage, 1 ohm CMOS Analog Switch... i get 25 'free-samples'... 11 bucks shipping, not too shabby.

should be in the mail tomorrow.....

so to update my design here, the flipflop is being used like a latching relay, to control the audio switch, which obviously switches the audio signals, crisply.

 

Sounds like your making progress. You going to be packaging and selling your idea. I'd really like to integrate an ipod w/o haveing to run a blank cd.

i was thinking i'd just throw the schematic up here, if anyone wanted to build their own... i dunno what kind of time i have to get boards and stuff made... but if there's a huge want... eh... why not. I still have to prove the idea with the audio switch 1st... i hope to get it all rigged up by the end of the week, if the switches some by then.

i was thinking i'd just throw the schematic up here, if anyone wanted to build their own... i dunno what kind of time i have to get boards and stuff made... but if there's a huge want... eh... why not. I still have to prove the idea with the audio switch 1st... i hope to get it all rigged up by the end of the week, if the switches some by then.

 

There's a guy at my work who builds guitar amps as a hobby; maybe with the schematic he could help me. I was hoping you were going to package and sell like jazzy.

well.. i will have extra circuitry laying around when i'm done.. you want a little black box with leads coming out of it, or a mess of wires and chips?

I think when i'm done i'm going to cram it all into a little plastic encasement and epoxy it in there, so nothing comes loose

little black box please with schematic, how much????

well.. i will have extra circuitry laying around when i'm done..

HAH! That's what I said over a year ago...and yet here I am. Good luck with your stereo install. I was afraid of people doing their own plug and play install, but so far it hasn't been a problem - cutting traces & soldering on the circuit board for the radio is another story though = experts only...but maybe not. Enthusiasts have a way of figuring things out, especially when they're determined to listen to their music!

 

Eventually I still want to cut my faceplate in half & install an aftermarket deck, but probably like so many others, with the "silent cd" board in, I can't really muster the motivation to do more with it since it works.

little black box please with schematic, how much????

 

Like i said, i have no clue... need to prove that it works first

i'm sure i'll eventually get something to work... but yeah it'll involve cutting traces on the circuit board, and soldering a few things... the FM connections, the SAT button, +5V from somewhere , a ground somewhere....

right now it looks like the chips.. if one were to buy the parts individually would be like 6 bucks or something... the JK Flipflop, and the 2 Audio switches needed.

Now if you were to involve a circuit board, those would need to be made... i have no clue what that costs... although we do have a PCB maker at school.... hmm....

Alright... so i've been slacking off a bit on this project (school and "work"... bleh..)

I have the main components, the JK flipflop, and the audio switches... the only problem is.. well.. you can see for yourself.. the size of the audio switches is.. well... small...

http://www.ultimatesubaru.org/photos/data/500/medium/audiochip.jpg

 

Does anyone know where i could get a socket for a 3x3mm chip.. with 16 pins?

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This web site has some tutorials for working with SMT devices, you might find them useful. A friend of mine who is into electronics tells me that once he got some practice working with SMT he found it easier than through-hole stuff. I've seen a couple of his projects and he's clearly got the hang of it.

 

http://www.sparkfun.com/commerce/hdr.php?p=tutorials

Alright... so i've been slacking off a bit on this project (school and "work"... bleh..)

I have the main components, the JK flipflop, and the audio switches... the only problem is.. well.. you can see for yourself.. the size of the audio switches is.. well... small...

http://www.ultimatesubaru.org/photos/data/500/medium/audiochip.jpg

 

Does anyone know where i could get a socket for a 3x3mm chip.. with 16 pins?

 

I don't think sockets exist for that package. And, that middle pad needs to be soldered. Two "easy" ways to do it are using heat gun (not really the preferred method though it works) or you can use a hot plate. Either way, that chip is not meant to be hobbyist friendly.

I found a board that i can solder it onto (i had no pad in the first plast).

And, the middle pad is supposed to be left non-soldered, if anything it's an extra ground, which there's a pin for already.

http://www.onsemi.com/pub/Collateral/NLAS4783B.PDF

 

The QFN to DIP board:

http://www.epboard.com/eproducts/protoadapter2.htm#QFNtoDIPAdapter

 

Not many SMT chips have a center soldered, because if you get solder in there, and push it down, you can short out stuff, cross circuits, all sorts of crap.

I think i'm just going to hot air flow it, no biggie.

I'd be interested in your finished package.

I found a board that i can solder it onto (i had no pad in the first plast).

And, the middle pad is supposed to be left non-soldered, if anything it's an extra ground, which there's a pin for already.

http://www.onsemi.com/pub/Collateral/NLAS4783B.PDF

 

The QFN to DIP board:

http://www.epboard.com/eproducts/protoadapter2.htm#QFNtoDIPAdapter

 

Not many SMT chips have a center soldered, because if you get solder in there, and push it down, you can short out stuff, cross circuits, all sorts of crap.

I think i'm just going to hot air flow it, no biggie.

Uh, that's news to me. It may be tied to ground but it wouldn't be there if it didn't serve a purpose, such as heatsinking or perhaps in this case to help with noise.

 

And yes, I'm aware you have to be careful when soldering center pads....but they do need to be soldered!

No Center Pads to be soldered

http://legacygt.com/forums/vbpgimage.php?do=full&p=2496&d=1167058959

 

I'll commence testing of the whole circuit tomorrow... gotta' go drive around new england now

A little update.. i got it working today.. sortof...

the right channels would switch.. and the left wouldn't for some reason... so i went to put a new chip on the board.. and i think i fried the board... but i have all the parts! and the audio switches seem to be working well!

I changed over to a D-Type Flip Flop (the J-K blew up.. )

Currently the thing is just a pile of wires and chips floating around... but hopefully within a week or so i can put one together nicely...

So... as i type this i am listening to music from the circuit pictured below...

http://www.ultimatesubaru.org/photos/data/500/halfworking.jpg

 

so, the input 1 (upper right corner) it working fine, signals turn on and off

input 2 (aux, lower right)... the right channel switches perfectly, the left channel has nothing.... sort of wierd.. becuase the other left channel works.. from input 1... maybe i didn't get that pin when i flowed the audio chip to the board... gonna have to trouble shoot that later tonight... but yeah... it works! AND it even has an LED

and... i think as i was typing this i fried the left channel... can't boost the volume too much... d'oh!!!!

anyhow... more updates when it works properly

If you need spare headunit, with mp3 playback, btw check this:

 

http://search.ebay.com/86201AG66A

wow ridiculous