Determine whether the noise is caused by common ground: 1. Connect the headset to the car MP3 and AUX (3.5mm interface) of the car navigation. If the sound heard from the headset is no noise at this time, you can confirm that the noise of the car equipment is caused by the common ground.
2. Use an audio cable to connect a battery-powered mobile phone or MP3 (note that the mobile phone and MP3 should not be connected to any power source in the car, such as a telephone), and the AUX of the car center console, and play the music of the mobile phone, so there is no noise , It can be confirmed that the previous noise was caused by the common ground.
3. Computer, power amplifier, audio, CD: Use passive headphones to plug in the computer to try to hear whether there is noise, use mobile phone to plug in the power amplifier and audio to audition, if there is no noise in the separate audition, it is basically judged that it is caused by common ground.
4. After starting the car, the installed power amplifier has current noise, and some models will also have the situation that the greater the throttle, the louder the current noise, this product can solve this problem. 5. There is current sound between the power amplifier and the speaker or audio, you can install this product between the power amplifier and the speaker.
6. When the notebook computer is connected to the projector and the power amplifier is connected to the power amplifier, there will be noise. You can connect the adapter power supply or use the battery through the notebook. Add a common ground isolator to eliminate noise.

Parts selection: Two independent audio transformers are used. The transformer materials are made of high-quality materials, which have high sensitivity and high reducibility, and the sound is fuller and purer than similar.
Circuit design: Stereo dual-channel in