Provides feedback to the primary side. If the voltage is "wandering" or the board is clicking, the optocoupler or associated TL431 regulator is often at fault. 🛒 Identification & Parts
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: Try to deduce the circuit's purpose or function. Is it for audio processing, power management, digital computing, or something else? zd-95-g-f schematic
Controller IC (e.g., LD75xx or OB series) and a Power MOSFET. Provides feedback to the primary side