12VDC Automotive Filter

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#1 21659704 03 Sep 2011 09:48

Patrick Hughes Patrick Hughes

Anonymous

Post #1
21659704 03 Sep 2011 09:48

Hello,
I recently built a Bluetooth adapter for a stereo that I added to my 4 wheeler. With just the audio cable connected to my device I have no noise. With the Bluetooth connected to the line I get a hum from the engine. I was wondering what a basic design would be for a 12VDC source filter circuit? I would imagine it would be some type of low pass filter. I just not sure of the design. I don't have much experience in power electronics.
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#2 21659705 03 Sep 2011 10:23

Charles G Nutter Charles G Nutter

Anonymous

Post #2
21659705 03 Sep 2011 10:23

Try optical fiber link. Kills the noise for sure but you need to know OC transceiver. You can buy it on alibaba.
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#3 21659706 03 Sep 2011 14:32

Cody Miller Cody Miller

Anonymous

Post #3
21659706 03 Sep 2011 14:32

If you could provide a diagram it would be helpful.

So the device sounds good when not using Bluetooth. When not using Bluetooth are you still using the 4 wheeler batter?

It sounds like a noise coupling issue with the Bluetooth part of your system. Coupling issues are either conducted or radiated. I would look for grounding or power issues in the way that the Bluetooth device was powered. Look at your cabling and maybe consider shielded cable.
#4 21659707 03 Sep 2011 14:47

Patrick Hughes Patrick Hughes

Anonymous

Post #4
21659707 03 Sep 2011 14:47

The Amplifier has it's own filter circuit built in so when using just the RCA cable to my device no "noise" is heard through the speakers. The Bluetooth has the audio ground as the common ground. So when the bike is running there is a lot of noise heard through the speakers. So I need to isolate the circuit somewhat but without going to AC. So I figure I can build a filter to remove the noise.
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12VDC Automotive Filter

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