ADJUSTABLE POWER: The supports PWM or TTL signal control, and the power is adjustable from 0-100%. Spindle supports PWM power 0-100% adjustable. Enhanced spindle drive can support 20000rpm spindle SHORT CIRCUIT PROTECTION FUNCTION: Cancel the drive module, use an integrated imported stepping motor drive, with short circuit protection, integrated heat dissipation aluminum alloy AUTOMATICALLY IDENTIFY WITH OPTOCOUPLER ISOLATION: Add offline recognition, can insert offline module and computer at the same time. Offline will automatically identify whether there is computer control. The spindle drive increases the optocoupler isolati GOOD HEAT DISSIPATION: Professional shell protection, the fan actively dissipates heat, and does not heat up for a long time. Increase the fan port for forced heat dissipation, increase the shell to protect the control board during transportation, and avo STABLE OVERCURRENT PROTECTION: Provide stepper motor overcurrent protection to avoid damage, upgrade integrated stepper motor drive, 2A high current with high stability. Added power button switch Feature: 1. OFFLINE ENGRAVING: Adopt for GRBL1.1f firmware, possess stable performance. With optional offline module, realize offline tool setting and engraving. directly into the picture for engraving, no programming, no design, simple and convenient 2. ADJUSTABLE POWER: The supports PWM or TTL signal control, and the power is adjustable from 0-100%. Spindle supports PWM power 0-100% adjustable. Enhanced spindle drive can support 20000rpm spindle 3. STABLE OVERCURRENT PROTECTION: Provide stepper motor overcurrent protection to avoid damage, upgrade integrated stepper motor drive, 2A high current with high stability. Added power button switch 4. GOOD HEAT DISSIPATION: Professional shell protection, the fan actively dissipates heat, and does not heat up for a long time. Increase the fan port for forced heat dissipation, increase the shell to protect the control board during transportation, and avoid short circuit problems during use 5. SHORT CIRCUIT PROTECTION FUNCTION: Cancel the drive module, use an integrated imported stepping motor drive, with short circuit protection, integrated heat dissipation aluminum alloy 6. AUTOMATICALLY IDENTIFY WITH OPTOCOUPLER ISOLATION: Add offline recognition, can insert offline module and computer at the same time. Offline will automatically identify whether there is computer control. The spindle drive increases the optocoupler isolation, so that the control board generates less heat, and the spindle speed regulation is more linear and safer 7. IMPROVED USB INTERFACE: The original USB interface is patch welding, easy to drop due to transportation collision and improper use, and now it is changed to a plug in, very powerful Specification: Item Type: CNC Engraving Machine Control Board Connection: USB (USB CH340) Software: For GRBL Controller, for UniversalGcodeSender Main Control Chip: For 328P Spindle Drive Chip: For MOSFET (recommended 24V, current within 10A) Spindle PWM Speed