Product name: UPC1892CT tone board Chip model: UPC1892CT Working voltage: DC 12-24V or AC 8-16v Processor speed: 3 Featured service: potentiometer fixed preamp tone board Potentiometer spacing: 25mm (fixed potentiometer version) Common problem handling: current sound (interference): the power supply of the tone board should be powered by an transformer. The iron core type is good, but the ring type. R type is not good. (Without a good power supply, the effect. Low noise is impossible to talk about). Potentiometer adjustment out of control or abnormal function: In this case, most of the potentiometer is installed on a metal panel, which causes a short circuit due to some reasons (the 1892 is DC controlled, the control voltage is short-circuited, and the function will be out of control). When encountering this kind of problem, it is necessary to remove all the 4 potentiometers from the panel and find out the reason for the short circuit with the panel. Colour:red Material:PCB+metal Size:95 x 45mm Package Contents: 1 * tone board 1 * Connecting line Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.