This is an AS1424 music spectrum display with a 32-bit high-speed processor that captures every detail of the music and displays it. This spectrum is driven by a dedicated chip, which shows the dynamic effect and can be used for frequency testing. MIC (electret microphone) and LIN (line input) two kinds of signal acquisition methods With professional-grade pure hardware AGC(automatic gain control)high-level adjustment of the peripheral audio processing circuit,(if the software AGC greatly reduce the spectrum sensitivity and accuracy),the professional adjustment of the AGC module,which guarantees The accuracy and effect of the spectrum not appear when the volume is too small to be displayed,and the volume be displayed on the full screen.The spectrum display amplitude can also be adjusted by the potentiometer AS1424 can be used for car music spectrum, because the car generally does not have an audio output port, the connection spectrum needs to be broken, AS1424 built-in high-sensitivity MIC (electret microphone) acquisition, only need to plug the power supply into the USB interface can be used (If there is not the USB interface,then it requires a (12V to 5V) lighter to USB converter), eliminating the need to disassemble the wiring 3 classic modes, single spectrum, spectrum + hold, floating point, with power-down memory AGC (Automatic Gain Control) Special Note:This product uses a professional AGC module and a highly calibrated audio processing circuit, pure hardware AGC. The benefits of using AGC:If the volume is too low, it automatically amplify, and if the signal is too large, it automatically reduce the amplification factor, so that the screen not be displayed full of volume. This greatly improve the sensitivity and display effect of the spectrum. (The AGC test of the V2 version video is shot in real life, and is tested at 20-100 of the output volume of an ordinary computer) It's DIY kits, needs to