omri
New Member
hello,
i am building a portable music speaker that has two main components:12v audio amp and 12v radio/BT/line-in module. they both get the power from the same supplier (can be 12v battery or 220v to 12v ac adapter). when i powered it i heard a buzz and when switching to BT mode i heared a buzz and periodic beeps that changed when connected/not connected/played music.
when they get power from 2 different sources everything works fine.
i also found out the when i disconnect the (-) power from the radio module it keeps running! or when i disconnect the (-) from the audio signal it still playes music without any decrease in sound quality or volume.
after searching the internet i learned that its called ground loop. i baught a passive filter that seats on the audio signal between the module and the amp and that didnt help at all.
i need your help on this, how can i overcome that serious ground loop?
omri
i am building a portable music speaker that has two main components:12v audio amp and 12v radio/BT/line-in module. they both get the power from the same supplier (can be 12v battery or 220v to 12v ac adapter). when i powered it i heard a buzz and when switching to BT mode i heared a buzz and periodic beeps that changed when connected/not connected/played music.
when they get power from 2 different sources everything works fine.
i also found out the when i disconnect the (-) power from the radio module it keeps running! or when i disconnect the (-) from the audio signal it still playes music without any decrease in sound quality or volume.
after searching the internet i learned that its called ground loop. i baught a passive filter that seats on the audio signal between the module and the amp and that didnt help at all.
i need your help on this, how can i overcome that serious ground loop?
omri