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Old 25-09-2015, 21:03   #1
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Join Date: Feb 2010
Location: Currently in Argentina
Boat: Catana C48
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Solar Charger Noise Coupling in to Audio Amps

Hello!

I have a 12V standalone audio amplifier (Lepai LP-2020A+) for my cockpit speakers. During the day when my solar array is charging there is an annoying buzz coming from the speakers thats independent of the volume setting. I tried putting a choke from a car stereo in series, but it didn't help.

Anyone know what I can do to clean up the 12V leg? I'm hesitant to simply add capacitance because I have a pretty complicated charging system (2 engines, 2 solar arrays, and a turbine) and I'm worried that if I change the impedance of the house load significantly it may mess something up.

Worst case I'll use a LDO regulator, but I was kind of hoping I could get something off-the-shelf instead of having to engineer something (I'd need to step up the 12V before I use the LDO to avoid dropout).

Thanks!
-Jordan
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Old 25-09-2015, 22:18   #2
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Re: Solar Charger Noise Coupling in to Audio Amps

[QUOTE=Jordan;1923097]Hello!

I have a 12V standalone audio amplifier (Lepai LP-2020A+) for my cockpit speakers. tried putting a choke from a car stereo in series, but it didn't help.
/QUOTE]

It may have helped & proved the noise is not on the 12V Rail!! It may be a ground loop in the input side. You could try disconnectiong the input lines & putting a electro to short each input to see if there is any change.

Regards
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