What is the best transformerless power supply circuit for converting AC to DC (230VAC to 12VDC)? - Quora
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power supply - 230V to 12V step down transformer - Electrical Engineering Stack Exchange
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220 volt Ac to 12 Volt Dc Power Supply without Transformer - YouTube | Electronic circuit projects, Power supply circuit, Electronics projects for beginners
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12Volt Transformerless power supply | Power supply design, Power supply circuit, Electronic circuit projects
Simple transformerless power supply circuits | ElecCircuit.com