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Basic Power Supply Rectification Tutorial
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5V, 6V, 9V, 8V, 10V, 12V, 15V, 18V, 24V-1A Regulators using 78xx series | ElecCircuit.com
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220/230v Ac To 12v/5v DC Regulated Power DC Converter Bridge Rectifier
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LinuxFocus.org: simple DC power supply for your Lab.
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Adjustable 0 to 30V 2A DC Power Supply Circuit (Part 1/13)
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