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Diode Tutorial & How to build an AC to DC power supply

This video covers the basics of diodes, bridge rectifiers, and how to build simple unregulated AC to DC power supplies than can handle a few mA up to several Amps.
General purpose 1A diodes:
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I recommend watching my transformer tutorial first if you are confused about where I am getting the AC voltages from:

Here is a followup video on how to make a regulated voltage supply: