Thank you for this kind comment. You have just made me laugh out loud and have given me a good portion of positive energy ! BTW: It seems that the electronics community on KZfaq is bigger than one would think and it seems to grow every day :) So I guess there are much more crazy people out there than we think ;P

I've just discovered your channel through Dave Jones recommendation on his EEVBLOG 2 channel... Congratulations for all your work... I share your exact state of mind concerning recycling of old electronics, and I believe that people like us will soon rule the entire Universe... ;-)

I guess it would only be fair ;)

Hoopoe I appreciate it :)

Yes i think it stands for: "SCL" = "Serial CLock", "SDA = Serial DAta" or ("Serial Data Array" or similar). The Stereo is connected to other digital circuitry inside the car. For example the RDS-Feature (Radio Data System) enables the Stereo to filter digital information out of the radio signals and uses it to display the name of the radio station and other data on a seven segment display in the dashboard. When you enter the security code, the numbers of that code are also displayed there. I guess that's the purpose of those pins.

Thank you. I appreciate it :). In my earlier videos I often tried to be very serious, but I actually like being a bit humorous here and there ;P

It was a good balance.

The Post Apocalyptic Inventor Not as good as your video, but a similar idea kzfaq.info/get/bejne/pMh9abuG0pm8qX0.html

Matt Heilman A "Bluetooth Cassette" :D, that's not bad at all. I like projects were something old and (seemingly) useless is connected to something new and funky :D. And your video seems to be quit popular as well, so I guess many people liked the idea. The only downside is, that the audio signal is converted so many times before it reaches the amplifier. That is what I wanted to avoid in my attempt to basically "hardwire" the signal into the circuit. But in the other hand: Your approach has the advantage that you don't have to mod the stereo at all.

Matt Heilman Hey! In case you didn't notice: I sent you a private message.

Fark Tard There is a display inside the dashboard it is connected to the radio via a serial port. But the radio works without the display as well.

Cool ! Greetings to your sunny country at the Mediteranian Sea ! Germany is cold and dark right now, I wish I could wander along your shores right now !

In a normal analog audio amplifier I would maybe do the same thing, but in this case I think it is more practical to use the inputs of the audio processor. But using the the volume control to tap into the circuit would also ( in many cases) mean that you couldn't use the stereos internal balance, tone / equalizer functions, when fed by an external mp3-player.

I guess in the mid 1990s these stereos were still worth a pretty penny, but the full time job of "Car Stereo Thief" might have died out by now... A Stereo like the one in my car is worth 1-3 € on ebay :D The instrument on the right is a tube-oscilloscope. And by "tube" I don't mean the CRT. The entire circuitry is built on electron tube technology. The unit was build in communist eastern Germany ( The "GDR") back in the early seventies. It is still running well !

The Post Apocalyptic Inventor Cool! - I love CRT's and other Vacuum tubes, too. I would just not take it for a scope, because there is no front controls on it!

That's the weird thing about it: the controls are mounted on the right side of the enclosure (inside an indentation). Maybe I will make a video about my gear some time in the future.

The Post Apocalyptic Inventor I would love a video of all your special and home-made gear!

l want people to think for themselves and I still hope that people will do some hacks of their own, after watching this video. When I explain how it works, this idea can maybe be applied to other models as well. Would I simply do the hack without giving an explanation, than this idea could only be applied to exactly the one model shown in the video. The song is an old folk melody from Scotland. I'm not sure about its name though.

Gubelat Ja das wäre auch möglich. Es ist allerdings nicht ausgeschlossen, dass ein Bluetooth-Modul Störungen im Radioempfänger oder sogar im Verstärker hervorrufen würde. Man müsste eventuell etwas Abschirmung aus Metall hinzufügen.

That's actually not a bad idea. But I like these switches :D. The more of them, the better ! I'm from Germany

The Post Apocalyptic Inventor I leave my 3.5" jack plugged into the stereo all the time so that mod wouldn't work for me

***** You can also get little bluetooth PCBs on ebay - you can hide them in the stereo hooked up to the line input too

Here is a page, where you can find various pinouts of Toyota stereos. Just look for a connector that looks like the one on your unit: www.tehnomagazin.com/Auto-radio-car-connector/TOYOTA-Car-Radio-Wiring-Connector.htm

I aleardy have the pinout, from the same site, it works on radio and casette, but i will try to do some measurements

You can't really know it unless you try it, or have the entire circuit diagram in front of you. In general it is bad to not replace a load by a resistor, because you might then have an open collector( or open drain) transistor on the circuit board. That could possibly lead to problems, because no clearly defined logic state ( 1 or 0 ) might be present at the collector. It could possibly lead to malfunction of the device, or even to wild oscillations etc. It is highly unlinkely that the radio will be permanently damaged, but since a resistor like that costs next to nothing these days, I don't see a problem in soldering one on the board.

I'm actually a long time Heavy Metal fan. But that's "Hardcore" and I never really liked that particular style. Concerning the jack: I did this hack on one sunday afternoon. I simply took those parts which I had in the house, and I didn't have a jack with an integrated switch. Besides: These jacks have normally just one switch, so it would have been necesary to add at least one more transistor circuit to activate the second switch. I also don't see the problem of putting a nice little switch on the front panel. I like how it looks and there is enough space anyways.

akkudakkupl Yeah I'm, sure optical improvements are possible. I did this in one afternoon and didn't spend a lot of time on thinking about the looks. It's just one of many possible ways to do it. The music is folk music from Scotland. I listen to it once in a while when driving :D

The Post Apocalyptic Inventor Function over form ;-) Problem is my Gamma is dead. There is no +5V on parts of the board, seems some SMD transistor gave out its life. As I suck with SMD I think the radio is either going to the bin (I would hate that, I like the original look of the interior) or I will have to shell out some Euros ;( Or get better with SMD :D

Well everybody's sense of humor is a bit different I think ;P That cassette is from a (girl)friend of mine and I guess she wouldn't like my jolly Scottish Folk Music as well :D

Ronor Cannel If you browse through the comments, you will see that I already answered that question to some other people.

probable but i don't have time to read all of them :)

Ronor Cannel Yeah and I have enough time to answer them all, even though the questions are repetitive ? :D Oh boy. Well to make it short: I basically used the switch, because I didn't have a jack with integrated switches at hand. But it's also not that simple, because you have to close two separate switches. So you would need a jack witch not one but two integrated switches, or you would have to add ad least a little ciruit with some transistors.

Ronor Cannel I can say from first-hand experience doing essentially the same project (with a slightly different approach) that using a jack with a built-in switch can be problematic, especially if you use a low quality jack. Basically, any minor abrasions or corrosion of the jack switch contacts can cause the system to go between an on and off state as things vibrate, causing the audio to crackle and pop. A solution might be to have the jack-based switch control a more stable debouncing switch sub-circuit, but who wants to go through that trouble?

Ronor Cannel Dont even think thats a good idea. At least for me, as I tend to leave my AUX cable in the radio all the time.

dieselscience I actually do enjoy heavy metal, but the music on the cassette was hardcore and that's not my style.

+The Post Apocalyptic Inventor Can you tell me how to fix a car stereo it is an original headunit with a usb to plug flash dirves in but after 7months the usb wont work or read nothing happned when i plug the flash drvie in it tried different drives to but they dont work and all of them work in other head unit i unmount it and every thing was good wireing capisitors and every thing was good i also scrap the face to inspect the usb port all connetions are good and soldered the stereo is a pioneer deh 15ub. thanks in advance i liked and sub

Sorry but no since I soldered a wire to fix an error message this happen a month after

The error message is amp error and it was fixed and I will try to get the pics

Niki Dorian absolutely. The amplifier sections of almost all car stereos, no matter how old, are basically identical to even the newest units. It's the same with most audio equipment. But nevertheless the big companies have managed to trick people into buying new units constantly. Most of the time because some new medium has hit the market, but just as often out of simple optical design changes. We have to stop thinking that way !

ntme9 Opel is a subsidiary of the General Motors Company

Ahh, I see.