JP1, JP2 function description:  If the microphone type is set, by setting JP1, JP2, two types of dynamic microphones and electret microphones can be used. There are matching shorting caps. When the shorting cap is plugged in, the electret microphone is used. circle microphone. Using special karaoke chip PT2399, patch technology, stable performance, two original imported ne5532 audiophile-grade op amp chips are used for the front and rear amplifiers of the microphone board. By setting jumper caps, both electret microphones and dynamic microphones can be used. Use, the power supply adopts a single power supply, there is a rectifier circuit, and it can be used for both AC and DC.    Working voltage: AC 6V-15V   Or DC 7-24V    Board size: 100mm*50mm  Potentiometer spacing: 25mm (potentiometer fixed version)  Distance between two microphone sockets: 28mm