CAR LED music line-out electric scheme - - - - HELP!!! (Beginer)

robikaz · May 14, 2011

Hi mates,

I need help in my project witch is not working and I don't know why...

So I made 16 LED's in parallel each of 4 in series... (On my car roof) connected it to port plus - minus and it works correctly. Also made leads to this project of plus and minus check it out.

http://www.instructables.com/files/deriv/FCU/RRYN/G69MW3Z5/FCURRYNG69MW3Z5.MEDIUM.gif

But there is no AUX output in my stereo so I used line-out witch is the same (I guess

)

Conected it everything right, checked it more than 10 times, so where is the problem? Is graphics faulty? Or car stereo isn't compatible with this project? I know that it should work cause when I plug on my sub and line out, and when I turn potentiometer I hear that hard noise and when I don't move potentiometer stick it goes to normal sound... That means, that every component is still working... Nothing is fried out...

Also, how to know that my TIP31 ( I used BD241C - It's the same) Is not fried also? maybe I bought broken one? But it looks just fine... Because it's all in my car, and all wires are wrapped above roof, there is no chance to test it somewhere else (like PC)

Thanks guys I'm a beginner so scheme is not how you are used to see everyday and please talk in my language of electronics (lame)

robikaz · Jun 2, 2011

I think, that the middle pin of potentiometer gives (+) voltage to base of transistor which turns on the LED's... the base of BD241 needs only 0,7 V to give electricity flow to LED's... And I think that turned potentiometer givesthatsmall amount of Voltage...
Is it possible? I think that's the most logic way of explanation

visualchillout · Jun 2, 2011

The 1uF 100V capacitor will not pass on dc from the potentiometer centre to the transistor base (left terminal).
You seem to have gone backwards on all I have suggested, so I can't help you any more.

robikaz · Jun 3, 2011

So if potentiometer center pin would be connected directly to base of BD241... maybe then it lighted up? actually I don't remember how I did it...
Anyways it's not working how it's supposed to work..
Any new ideas? What about AUX output? Is it correct for that scheme?

robikaz · Jun 5, 2011

Bought Voltmeter today, so maybe I could test somethig.... Write what should I test and how (that means negative wire and positive to witch side)
Thanks ;]

robikaz · Mar 31, 2012

Hi. Back to my project! Since I left my project untouched for so long, I found some time to get back to it today. And guess what! I made it work

I just couldn't believe it that I didn't tried this step many days ago

So what I did?
I connected negative wire of AMP sub woofer line out to transistor base pin using 10k resistor in line to protect it from High Voltage. And LED's just started to blink to base of sound

When I tried this I didn't used POT since I don't know how to use it properly. And actually it's not perfect. LED's not lighting very bright.
Maybe anyone have some Ideas since the project is working?