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9V, 2A DC power supply - Electrical Engineering Stack Exchange
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3a adjustable voltage regulator using LM317-2N3055
12V DC Power Supply without Transformer - Power Supply Circuits
Transformerless Power Supply - 220V AC to 9V DC
9V, 2A DC power supply - Electrical Engineering Stack Exchange
5V Transformerless DC Power Supply from 220V with LM2575 - Power Supply
12v dc dual power supply circuit
