Driving a variety of opportunities: Optical isolation has strong anti-interference capabilities and can drive high-power transistors, MOS tubes, and other opportunities that require high-voltage drive, and can also directly drive and operate low-power 24V relays. Simultaneous control of different voltages: The four channels of 817 on the board are independent, enabling simultaneous control of different voltages, etc. Turning on the control terminal: A 3.3V or 5V control interface with a voltage level of 3.6~24V can be realized. When the control terminal is turned on, the controlled terminal is also turned on. High-level or pull-down output: Whether the output terminal is high-level output or pull-down output can be realized through a jumper cap. High-quality PCB materials provide reliability and miniaturization, good maintenance, and compatibility. 57-30