![]() The louder you turn up the radio, the louder the noise. For any of you that have experienced alternator noise in your car radio, it is a horrible whine that increases or decreases in pitch related roughly to the speed you are going. However, the Bluetooth needed power so as soon as I plugged the Bluetooth receiver in for power, the alternator noise was right back. I tried everything including buying a mini blue tooth receiver so I wouldn't have to plug my phone directly into the radio. I love music and this of course drove me completely crazy. As soon as I attached power to my phone through either a USB plug in the console or through the cigarette lighter connection there would be horrible alternator whine in the system. However, as we all know, you can only listen so long before you want to plug your phone in for power or to charge. I loved plugging in my iPhone or Android device and listening to Pandora or Spotify. I only mention that because I am very picky about my music and have a real hard time with any kind of noise in the system. I am a car audio fan so I installed a full system with aftermarket speakers, amplifiers and subwoofers. I have a Dodge Durango and installed an aftermarket radio with an auxiliary input on the front face of the unit. Works with all notebook and desktop PC's and all portable devices with 3.5mm mini-stereo plug.Eliminates ground loop noise between the audio source and TV, or audio amp.If you connect the output with DC offset directly to the coils of the transformer a DC current will flow in the coil that may or may not affect the way the source behaves.Įveryone with a notebook should have one of these in their bag (along with an EDID emulator ), so the next time you do a presentation, you will have the purest sound along with sharp and trouble free video image. Most audio sources should have these AC coupling caps on their outputs anyway (so their average output voltage is not biased at some DC voltage), but once in a while you have a source that has a DC output offset. The input side (the female 3.5mm at end of cable) has DC blocking capacitors, so it is a good idea to make sure to not reverse the input and output. So if your load is 5K Ohm, adding the isolator in front of it, the source still sees a 5K Ohm load impedance. It uses 1:1 audio transformers therefore it does not change the impedance. In order to isolate this Bias level from the transformer coils, DC blocking capacitors are employed in the GLI-35mm. Some audio source equipment may have a DC bias voltage on their audio signal. The input side incorporates DC blocking capacitors. In most cases the unit can be used in either direction, however it is designed so that the Female 3.5mm mini-stereo connector is to be used as input and the male connector is the output. The GLI-3.5mm is simply inserted in series with the audio and it literally eliminates the ground connection between the two sides, passes all the audio while filtering out any noise using high performance audio transformers. Line-level audio is a very tiny low-level signal, so any noise in AC ground, even as little as 0.004v, will be quite audible - yuck! ![]() ![]() This is because, by doing so you inadvertently eliminated the ground loop. In fact you may have noticed that if you disconnect your notebook power supply and ran on batteries the noise has gone away. On the other hand unbalanced signals, such as the one coming out of your notebook, have no reference other than building/AC ground. Any noise in the ground between the source of the Audio signal and the amplifier is automatically ignored. Professional equipment have balanced audio which uses a + and a - signal for each L/R side and therefore does not rely on ground. Have you ever connected a PC or notebook to an audio amp or a TV and gotten all kinds of ugly noise? Most people would answer yes, and that's because the audio output from these devices are not balanced. Uses proprietary audio transformers and filters for total elimination of any spurious buzz and hum in the audio. Perfect frequency response of +.03 db from 20 to 20,000Hz. Eliminates ground loop noise between any audio source such as a notebook PC and audio equipment. GLI-3.5mm Stereo Audio Ground-Loop Isolator & Filter with 3.5mm connectors. Hall Research Stereo Audio Ground-Loop Isolator & Filter with 3.5mm connectors, GLI-35mm
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