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Tutorial: How to build and design an AC to DC Power Adapter / Supply

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Tutorial: How to build and design an AC to DC Power Adapter / Supply

98,361 views October 25, 2013 39:17

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Channelmjlorton

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In this video I go through the process of building a simple 12 volt AC to DC power supply.
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In this video:

* Using spare parts to build a simple AC to DC power adapter / supply:

Parts used:- transformer, full wave bridge rectifier with Schottky (rectification) diodes, smoothing / filter capacitor, voltage regulator (LM7812 / Zener diode), resistor and LED to display operation.
* Electronic DC load to test the PSU, oscilloscope to view signal, Multimeter to measure output.

* How to calculate RMS voltage?
* How to calculate capacitor value?
* How to calculate ripple voltage?
* How to calculate the resistor value to run an LED?

This is a simple means of calculating the required size of the input filter capacitor in a basic power supply, or calculating the peak-to-peak ripple voltage in an existing supply. It works by assuming that the capacitor supplies current to the load approximately 70% of the cycle—the remaining 30% is supplied directly by the rectified voltage and during this period the capacitor is charged as well:
electroschematics.com/7048/capacitor-input-filt…

* Electronics Tutorial #5 - Ohm's Law Pt 2 - Application:LED Resistor, Voltage Divider, Current Shunt - youtube.com/watch?v=AWLJADJTWHU

* Electronics Tutorial #7 - Diodes - Zener, Schottky, LED, Silicon - youtube.com/watch?v=e2qCGpZ8wQ0

* Electronics Tutorial #8 - Diodes - practical applications - youtube.com/watch?v=d4Z8VI3myBw

About this tutorial

mjlorton published this 39:17 video tutorial on October 25, 2013. It has been watched 98,361 times on YouTube.

Channel
mjlorton
Duration
39:17
Published
October 25, 2013
Views
98,361
Likes
1,502

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Further reading

  • How to Build Your Own AC/DC Power Adapter | Our Pastimes ourpastimes.com

    Making your own AC/DC power adapter is a good project for an intermediate-level electronics hobbyist. This will give you the fun of building a practical circuit you can have for general bench use or to power small elect…

  • Create a DC Power Supply : 3 Steps - Instructables instructables.com

    I’m struggling on designing a power supply like that, not sure if just try to have a 120v ac to 50V dc then use resistors to divide voltaje and create the outputs calculating to make 5.1V and 3.0A on each.

  • How to Make an AC DC Converter: 5 Steps (with Pictures ... wikihow.com

    One winding is called the primary. The primary is driven by the main AC supply. The other winding is called the secondary. The secondary serves as the power input to the AC DC converter. This transformer and all of the…

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