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A Guide to Transformerless Power Supply Design: Principles and Safety
"A transformerless power supply is a circuit that derives low-voltage DC directly from an AC mains source using capacitive or resistive reactance rather than an electromagnetic transformer. While these circuits are compact and inexpensive, they lack galvanic isolation from the mains, making them suitable only for specific, enclosed, or low-power applications where safety measures are rigorously implemented. Understanding the Fundamental Concept At its core, a transformerless power supply functions by dropping the high voltage of the AC mains (120V or 230V) to a manageable level through impedance. Unlike traditional power supplies that rely on..."
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