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  1. W

    How to kill engine noise?

    No more comments? :-[ Anyway, the project is fixed, 100% working and with no noise at all. For thouse that is looking forward to build this project for your car (trust me, you will not regret this!) here is the full schematic and board design. After you build and intall the circuit at your...
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    How to kill engine noise?

    Problem solved, since the noise was coming from the ground i cut and isolate the ground from the input and output RCA and rejoined with a 10 Ohm resistor, no more engine whining thanks God! Because of the changes, the gain was reduced also, now i'm working out this issue changing the R5 100K...
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    How to kill engine noise?

    Well, adding the resistor to the ground just make things worse it amplify the noise, the choke coil makes no difference, maybe reduce the noise a bit but do not solve the problem. Next move is to feed the circuit with symetric voltage from 12v from battery, so i came up with the design bellow. I...
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    How to kill engine noise?

    Much more information about ground loop can be found at this site: http://www.epanorama.net/documents/groundloop/
  5. W

    How to kill engine noise?

    This book does not solve the problem but gives a lot of information about ground loop and how to make a clean instalation to prevent it. http://www.benchmarkmedia.com/pdf/caig.pdf The book is free, http://www.benchmarkmedia.com/caig/html/
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    How to kill engine noise?

    Thanks MP, i wil take a look!!!
  7. W

    How to kill engine noise?

    Hello guys. This is making me sad, the noise still there :-[ nyjumpee, no, the noise do not get worse with headlights on, night is better because is more quiet at night. But the effect is the same is like a whine/buzz coming from the engine and also changes with the RPM. And looks like my...
  8. W

    Knight Rider with Halogen Bulb

    Nice, i will make the same effect but for a break light for my car with very bright led's, but i will change some things to look like a normal break light (all led's on) and than after some time knight rider effect, you see here at Brazil we can't use any light effects outside the car, like...
  9. W

    How to kill engine noise?

    I can't believe it, the guy who installed the device on my car was feeding the circuit with 12v from ignition (also know as REMOTE) not directly from the battery >:( In my car was made a specific design to distribute the voltage directly from battery to amps and head unit. The voltage from...
  10. W

    How to kill engine noise?

    It changes its pitch with the revs of the engine, it should stop it but it still there. No, the zenner is fine, my car battery charges at 13.8v max, the zener never heat it up. I will make some more tests tomorrow and i will let you know.
  11. W

    How to kill engine noise?

    By the way, the effect is AMAZING. If you are doing nothing and are searching for something to build, this is the one, incredible!!!! I'm using the Alpine SBS-05DC to make my center channel but with out it it will do the same effect. Here is some examples, but, hearing the effect is much...
  12. W

    Simple O2 meter with LM3915

    Don't know, in my car (Fiat Siena) it doesn't start the engine if i disconnect the O2 connector.
  13. W

    How to kill engine noise?

    Hello guys! After building the Surround sound for car and installed in my car i've noticed that there is a engine noise on the speakers, the noise increase decrease when i hit the throttle, i can hear the noise when the volume is down and the ambient is quiet other wise there is no noise...
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    Simple O2 meter with LM3915

    Yes, and the engine will not start.
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    Simple O2 meter with LM3915

    Hello, i really dont know what type of O2 sensor my car uses, i know that is 4 wire type, looks like a cigar and has a hole in the middle. About printing, here is the tip, load the PDF in to Photoshop. In resolution set to 600 pixel/inch, grayscale mode, 16bit and remove (uncheck) anti-aliased...
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    Simple O2 meter with LM3915

    Today is a great day, there is no way to put in to words, to develop something and see it working is a great feeling. Since i was a kid and started with electronic at 6 years, we had a very difficult time, my family was very poor so i've never got the oportunity to go to college or learn english...
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    Simple O2 meter with LM3915

    Hi audioguru, i've added resistors up to 1M and make not change at all, just a little shadow makes the led to turn off. And by the way, is the first photo-transistor that looks very much like a LDR to me.
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    Simple O2 meter with LM3915

    Hi Audioguru, well i've done the changes but.... some how works. At normal day light the led bright is strong, but just a little shadow make the LED to shut down. :( Putting all back again, if i change the R9 to 100K the effect become a little more effective, but not that much. Increasing the...
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    Simple O2 meter with LM3915

    In the light 7.6M, dark 0ohm
  20. W

    Simple O2 meter with LM3915

    Hello audioguru! The circuit work in the reverse way, when is dark the led must bright more, the day light must make the led dim off ;D Changing the LDR with a 10k resitor make the led bright a bit, about 25% or 30%, shorting the connection make the led bright at 100%, when i say that it...
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