Jymc220bi Schematic Full ((exclusive)) Access

The is an industry-standard control board widely used in desktop metalworking machinery. It is the core power component for popular household mini lathes, such as the CJ0618 series mini lathes .

| Pin | Name | Description | Typical Voltage | |-----|------|-------------|-----------------| | | VIN | Input voltage (4.5 – 38 V) | – | | 2 | GND | Ground (common) | 0 V | | 3 | SW | Switching node (connects to the internal MOSFET) | Pulses between VIN and GND | | 4 | FB | Feedback (fixed internally for 5 V/12 V; external for adjustable) | ≈ 0.6 V (reference) | | 5 | EN | Enable pin (active‑high). Pull high to turn on; pull low to shut down. | 0 V or 3.3 V | | 6 | SS | Soft‑start control (optional). Usually left unconnected; pulling low reduces inrush current. | – | | 7 | TEMP | Internal temperature sensor (not usually accessed). | – | jymc220bi schematic full

The circuit begins with an inline fuse (usually 5A to 10A fast-acting) and a Varistor (MOV) to suppress voltage spikes from the mains. The is an industry-standard control board widely used

JYMC-220B-I is a sophisticated DC brush motor speed controller, primarily utilized in high-torque industrial and hobbyist applications such as the Weiss Machinery mini lathes (e.g., Pull high to turn on; pull low to shut down

The full circuit schematic of the JYMC-220B-I PCB assembly is structurally split into five functional sub-circuits. Together, they regulate line voltage, handle high-amperage switching, and continuously correct motor speed drops caused by material cutting forces. 1. AC Main Input & Filtering Stage

Adjusts the starting voltage when the main potentiometer is turned to zero.