A20112 Power Supply Schematic Jun 2026

If you are repairing or building a circuit based on this model, keep these common issues in mind: Noisy Potentiometers:

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Uses components like diodes (often in a bridge configuration) to convert AC into pulsating DC. If you are repairing or building a circuit

: Unlike proprietary power bricks, the A20112 is a bare-board or aluminum-cased switching mode power supply (SMPS) designed for integration into larger projects . It is prized for its 120W capacity , allowing it to handle high-power demands—like heating a 3D printer's bed or running multiple security cameras—without failing . 12V Out (+) --- Resistor Divider --- TL431

12V Out (+) --- Resistor Divider --- TL431 (Ref pin) --- TL431 (Cathode) --- Optocoupler LED --- GND Optocoupler Transistor --- PWM Controller (FB pin) --- Adjust duty cycle.