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Connect the speed control knob (typically 4.7k to 5k ohms). The middle pin usually connects to P2.
This is the speed control dial. On these boards, the potentiometer often includes a built-in safety switch that must "click" off to reset the circuit before you can change the spindle direction. jymc220bi schematic full
Most users looking for a schematic actually need the . Based on common configurations for these boards: AC Input (L/N): Connects to the main power lines. Connect the speed control knob (typically 4
Labeled for the motor's armature connections. If the motor spins the wrong way, reverse these two wires. jymc220bi schematic full
Uses high-current SCRs (often S8020L) and Diodes (D8020L) to rectify AC to DC and control the speed. Control Logic:
