Category: Tutorial videos

LM386 amplifier

How to make a simple 1 watt audio amplifier (LM386 based)

A tutorial on how to use the popular LM386 class AB audio amplifier IC to build a simple mono 1 watt audio amplifier. It costs less than $3 in parts! There is also a brief discussion of how to use high pass filters to prevent op-amp oscillation and subsequent noise. Sponsored by The Great Courses […]

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Power watts

Basic Electricity – Power and watts

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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Resistance and Ohm's law

Basic Electricity – Resistance and Ohm’s law

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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LED tutorial

LED Basics

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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voltage

Basic Electricity – What is voltage?

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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12v dc to 12v ac inverter

Don’t build this 12V DC to 120V AC inverter circuit

A description of how a popular 12V DC to 120/240V AC inverter circuit works and its MANY limitations. Watch this video before you build inverter circuits you find online else you risk damaging your equipment!

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Frequency Modulation tutorial and FM radio transmitter circuit

This video explains what frequency modulation (FM) is and shows a simple low powered FM radio transmitter circuit you can build. It has a range of about 20 meters. PCB        Design files

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laser tachometer

How to build a simple laser tachometer

Did you know you can use an LED as a light sensor? In this video I show you how to use this phenomenon to build a laser tachometer capable of measuring the RPM of mechanical devices.

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zener diodes

What is a zener diode? A zener diode tutorial.

A tutorial on zener diodes and how to use them as voltage clamps, voltage regulators, and how to create audio distortion circuits.

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schottky diode

What is a schottky diode? A schottky diode tutorial.

A tutorial covering the advantages and disadvantages of schottky diodes over regular silicon diodes including forward voltage, efficiency, leakage current and recovery time issues.

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constant current source

Constant current source and laser / LED driver tutorial

An overview of constant current sources and how to build one out of an LM317. Examples are given where you can use a constant current source to drive a string of LEDs or a laser diode.

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Accelerometer tutorial - what is an accelerometer?

How an accelerometer works!

Have you ever wondered how your phone’s tilt sensing function works? It uses a device called an accelerometer. In this video I explain some basic concepts of MEMS (microelectromechanical systems) and show you some MEMS dies under a microscope. Then I explain how these tiny structures can be used to sense acceleration. Accelerometer math

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How to charge a LiPo battery

How to charge a LiPo battery with a power supply

How to charge a single cell lithium ion or lithium polymer battery with an adjustable, current limiting bench power supply.

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Battery chemistry

How to choose a battery: A battery chemistry tutorial

There are many different types of rechargeable battery chemistries out there. Li-Polymer, NiCd, NiMH, LiFePO4, lead acid and more. In the first half of this video I give a brief overview of the basic pros and cons of each type of rechargeable battery chemistry and help you choose a battery for your project. Then in […]

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Amp-hour watt-hour battery capacity

Battery amp-hour, watt-hour and C rating tutorial

You may have seen batteries with things like “2000mAh” written on them before. This refers to the capacity of the battery, i.e. how much juice it can hold. In this video I explain Ah (amp-hours), Wh (watt-hours) and C ratings of batteries.

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