Hi folks,
I have been building a class D amplifier based off the wondom aa-ab32313 board for the L/R speakers and also AA-AB31315 board for the subwoofer. I have the input fed into a to a AA-AB41134 digital volume control, which is then split off into 2 paths. the first path goes into a AD828 preamplifier that amplifies the signal and then is sent to the first amplifier. The second path is where the signal is sent into the NE5532 subwoofer preamplifier/lowpass, and then sent directly to the 2nd amplifier. Both amplifiers use seperate 36v power supplies. However the first power supply also powers a LM2696 step down converter that steps down the 36v into 12v, and then powers both the stereo preamplifier and the subwoofer preamplifier. However, there is some ground loop noise and I'm not sure how to fix that. Do I use 3 separate isolated step down converters to power the volume board, and both preamplifiers separately or is there a more cheaper and easier solution?
I have been building a class D amplifier based off the wondom aa-ab32313 board for the L/R speakers and also AA-AB31315 board for the subwoofer. I have the input fed into a to a AA-AB41134 digital volume control, which is then split off into 2 paths. the first path goes into a AD828 preamplifier that amplifies the signal and then is sent to the first amplifier. The second path is where the signal is sent into the NE5532 subwoofer preamplifier/lowpass, and then sent directly to the 2nd amplifier. Both amplifiers use seperate 36v power supplies. However the first power supply also powers a LM2696 step down converter that steps down the 36v into 12v, and then powers both the stereo preamplifier and the subwoofer preamplifier. However, there is some ground loop noise and I'm not sure how to fix that. Do I use 3 separate isolated step down converters to power the volume board, and both preamplifiers separately or is there a more cheaper and easier solution?
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