It is suitable for power supply occasions with high requirements for power supply ripple voltage. It is mainly used for car radios, shortwave radios, radios, tube radios, laboratories, precision instruments, notebook power supplies, small single power supply class A power amplifiers such as JLH1969 and other applications. The DW on the PCB is an overvoltage protection regulator tube, the voltage is generally about 3-5V higher than the output voltage, the specification is 5W, 40TPS15 is a 40A unidirectional thyristor. The z main circuit on the board is the parallel output of the op amp servo 3pcs voltage regulator chips. Three pieces of LT1083 can output up to 22A. 3 pieces of LM338 can output 15A. It is recommended to take one third of the maximum current for long-term work. PCB Size: 105mm x 95mm Fuse Size: 6x30mm Input Voltage: DC 32V or less Output Voltage: DC 5V~25V Color: Blue Material: plastic Package Contents: 1*Board Only the above package content, other products are not included. Note: Light reflection 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.