Hello,
I have a boat where I installed a number of homemade RGB LEDs to act as lights. To control the LED's I purchased the following controller:
http://www.superbrightleds.com/moreinfo/rgb-controllers/led-product/111/
The lights/controller work fine but after connecting it to the boat battery I started hearing a high pitched hum coming from the stereo speakers when the lights were on. If I shut the lights off at the controller, the hum went away. If I directly connect the controller to the battery then the lights work and I do not hear a hum. I have troubleshot the issue down to the controller and I think it is causing a ground loop or putting out a signal on the ground. I have attached a simplistic picture of how things are connected in the boat: stereo/amp, controller share the same ground from the battery.
If I remove the controller and connected the lights to the switch / ground block then the lights work and I do not hear any hum in the speakers. If I put the controller back in, the hum returns only when the lights are on (I.E the power is going in the controller and out on the RGB+ lines to the lights.
The question is what could be causing this? Is it possible for the controller to being sending something out on ground that is being amplified by the amp/stereo? If so, can you think of a way to filter it or stop it?
Thanks
Tim
I have a boat where I installed a number of homemade RGB LEDs to act as lights. To control the LED's I purchased the following controller:
http://www.superbrightleds.com/moreinfo/rgb-controllers/led-product/111/
The lights/controller work fine but after connecting it to the boat battery I started hearing a high pitched hum coming from the stereo speakers when the lights were on. If I shut the lights off at the controller, the hum went away. If I directly connect the controller to the battery then the lights work and I do not hear a hum. I have troubleshot the issue down to the controller and I think it is causing a ground loop or putting out a signal on the ground. I have attached a simplistic picture of how things are connected in the boat: stereo/amp, controller share the same ground from the battery.
If I remove the controller and connected the lights to the switch / ground block then the lights work and I do not hear any hum in the speakers. If I put the controller back in, the hum returns only when the lights are on (I.E the power is going in the controller and out on the RGB+ lines to the lights.
The question is what could be causing this? Is it possible for the controller to being sending something out on ground that is being amplified by the amp/stereo? If so, can you think of a way to filter it or stop it?
Thanks
Tim
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