![]() ![]() Please give me a final "push" to the finish line So, I finally have a little more hope now, although I have no idea what the guys is referring to as "through the Throttle". "need to cut GND and AGND and connect them through the throttle, it will remove digital noise" 1) made me "recharge" some energy and I spent another hour or so actively reading about AGND and GND related ground loops, I couldn't find any information that could help BUT, in one of the AliExpress many Sellers Reviews, I found this little comment that made my day (regarding the same product): Thanks everyone for taking the time to read.Īlthough it might seem odd, your comment nr. If you guys, the Audio Masters, can shed me some lights and possible (reliable) solutions, I would be forever appreciated. Initially I wanted to step-up the voltage going to the Amp (from 12v to 19v) and I do have the Step-Up Converter, but with this Ground-Loop thing I'm afraid of breaking the Audio Module if I do this (again, I read somewhere that doing exactly this might solve the Ground-Loop problem, but I really don't know if it's reliable information.) Pretty much that's it, I have no idea what I can do to solve this or at least reduce it to a certain level that I can "stand it". In one of the pictures you can see that they (AGND and GND) are "jumped" together with a single line. I read somewhere that the AGND and the GND (Analog ground and Digital ground - (D) on the shematics) can be the cause of the Ground-Loop, however, I couldn't understand why. So, the above are the scenarios that I managed to try, so far with no substantial results.By the way, the Audio Cables (L, Ground, R) are shielded FROM the amp and connect to the unshielded that come from the Audio module, does that make a difference? ![]() If I disconnect both (A) and (B), Audio Module stops working.ģ.) Acting stupid, I tried disconnecting the Ground of the Amplifier (C), BAD IDEA, I think that another 5 seconds and I would have busted the Speakers, they were pushed to the limits streching up&down.Ĥ.) I've tried all combinations of (B) and (C), connected at different lengths, connected directly to the power supply, connected at the exact same lenght, nothing solved it, however, shortening the Ground Wire of the Audio Module (B) did reduce the noise a little (the ground wire length of the amplifier (C) didn't seem to make any difference). Tried to connect the Analog Ground (A) out of both devices to the Power Supply Ground(or -12V), nothing happened.Ģ.) I've tried lifting the Main Ground of the Audio Module (B) or, in other words, leaving it disconnected from everything, nothing happened. 2 is the only one that matters because the goal is to have everything powered by battery):ġ.) I've tried disconnecting the Analog Ground (A) thinking that was the problem since it was the only ground connected to both devices, nothing happened. Stuff I tried (from this point on, Schematics Nr. 2 (single power supply), I've also added green letters A,B and C, this will be to better describe things I've tried and also the results. I have drawn 2 "wannabe-schematics", one with two different power supplies and the second with only one, they are attached. Statics noise per-se gets loud enough although I could live with it, but when I turn the Bluetooth ON, My God, Hell breaks lose and all the digital bips&clicks start coming out from the speakers (I can literally hear the bluetooth data passing by.kind of like a robot). So, what's the problem? Well, when I assembled everything for testing purposes, I connected the Amplifier to the Battery and the Audio Module to a 12v Transformer, spot-on, no noise at all no matter what function I was using (USB, Bluetooth, FM or Aux) BUT, when I connected both the Amplifier and the Audio module to the same power source (either to the Battery or to the 12v Transformer) Oh boy, what a mess. I'm building a portable radio for my girlfriend (something to match with our house furniture), here are the items list below (photos attached for the two items that are busting my brain):Īs you'll notice, extremely low-end Audio stuff, however, for the purpose, they are more than perfect, the Speakers sound good enough to enjoy music while cooking or reading a book, the Amplifier is clear and powerfull enough to drive the speakers perfectly and the Audio Module works like a charm. Yet another ground-loop issue, I know.I've spent the last few weeks reading everything I could about Ground-Loops, I've learned a lot and yet I've managed to acomplish nothing.I wouldn't bother you because I know there's a lot of interesting projects going on here in the forum but I'm very near of popping a vein in my head, I can't find a solution and my initial motivation to start a DIY audio project (a very simple one, as you'll find out) is quickly disappearing and turning into frustration. ![]()
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