The first part in a series of videos about the basics of electricity.
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What is voltage and what does it do? Learn about volts, coulombs, joules, power supplies and more in this video! Adjustable power supply
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A tutorial on the basics of using LEDs (light emitting diodes). Polarity, forward voltage and current are discussed. 300 LEDs for $13 500 resistors for $12 Adjustable power supply
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A tutorial on the basics of resistance, resistors, and Ohm’s law which describes the relationship between voltage, current and resistance. I also show you how to build a simple resistor + LED circuit. 300 LEDs for $13 500 resistors for $12 9V battery clips Adjustable power supply Ohmnilabs
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Everyone who knows anything about electricity will have heard of multimeters. They allow you to measure voltage, current, resistance and more. In this video I show you how to buy a multimeter and how to use it without killing yourself (always a plus). Update: The multimeter shown in the video is no longer available. Here […]
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A tutorial on electrical power and watts. A practical example of light bulb power measurement is shown as well as a demo how to calculate appropriate resistor sizes.
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Afroman debunks the popular myth that it’s not the volts that kill you, it’s the amps. Basically, the volts directly determine the current flowing through your body, so the phrase is stupid and dangerously misleading.
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How to use an N channel MOSFET to turn anything on and off. Also, remember to put a 100k resistor between gate and ground if you want your FET to stay off by default!
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You may have heard about infamous capacitor plague problem, where crappily manufactured capacitors died prematurely on people’s motherboards. Even if the capacitor was properly made, they still only have a finite lifespan, typically 10,000-100,000 hours. After this, you need to replace the caps or replace the whole board. This video shows you what to do! […]
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An oscilloscope is the most important piece of electronic test equipment you can buy after a multimeter. The first video shows you where you how to choose an oscilloscope. The second two videos show you how to use it.
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You can use voltage dividers to generate reference voltages, control audio volume, power low powered devices from specific voltages and much more. This video shows you practical voltage divider design issues and shows you the relevant equations.
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Afroman covers the basics of how transformers work, where to shop for step down mains transformers, and how to wire one up to mains voltages without killing yourself. European and North American wiring is discussed. He finishes up with a quick example of AC to DC conversion in an unregulated dual rail power supply. Remember […]
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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. I recommend watching my transformer tutorial first if you are confused about where I am getting the AC voltages from. The voltage regulator tutorial is […]
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This video covers the basics of linear voltage regulators – what they do, how to wire them up, and where to find them. Then I give a basic example of how to build a 5V supply that can be used to power USB powered gadgets. This video builds upon material covered in the transformer and […]
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Ever since the best decade of all time, the 1970s, people have been able to buy amplifiers in all-in-one chips rather than having to make them out of lots of discrete transistors. This video shows you the basics of op amps and has an example circuit where you build an amplifier to take a tiny […]
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