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 single cell lithium ion or lithium polymer battery with an adjustable, current limiting bench power supply.
Read MoreThere 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 […]
Read MoreIn this tutorial I explain DC-DC boost converters – a type of circuit used to step up voltage in an efficient manner. Towards the end I show how to construct a 50 watt adjustable boost converter circuit. Parts list: LT1370HV: http://octopart.com/lt1370hvct7%23pbf-linear+technology-532702 Electrolytic capacitors: http://octopart.com/eeu-fm1h471-panasonic-208645 Input and output ceramic caps: http://octopart.com/partsearch#!?q=UMK325BJ106MM-T Schottky diode: http://octopart.com/stps5l60-stmicroelectronics-334357 10uH inductor: […]
Read MoreThis video explains the purpose of feedback resistors in a buck converter circuit and shows you how to calculate them. Then I show you how to build a high current adjustable power supply using an LM2678 and a potentiometer. Parts list: LM2678T-ADJ: http://octopart.com/lm2678t-adjnopb-texas+instruments-15290279 Input electrolytic cap: http://octopart.com/eeu-fm1h221-ecg-208642 Output electrolytic cap: http://octopart.com/eeu-fr1c102b-panasonic-18987619 Input and output ceramic […]
Read MoreSwitch mode power supplies are a more efficient way to regulate voltage than linear regulators. In this video I explain buck converters, which are a type of switch mode power supply used to step down voltage. I also show you how to build a 5V 5A power supply using an LM2678. Parts list (Octopart) Schematic:
Read MoreThere are many different types of amplifiers. The most commonly used in audio are class A, AB and D. Class D amplifiers are inherently efficient reaching efficiencies >90%. This video shows you how class D amplifiers work, and how to build your own 2x15W stereo amplifier on a breadboard. Class D amp kit mentioned in […]
Read MoreAn H bridge is a type of circuit that you can use to control the direction of electric motors. In this video I show you how an H bridge works and show you how to build one that can control the speed and direction of a brushed DC motor using PWM. Parts list: NE555 timer: […]
Read MoreThis video shows different ways you can protect your circuit from backwards power connections. Diodes, schottky diodes and P channel MOSFETs are discussed.
Read MoreHow 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!
Read MoreThe first part in a series of videos about the basics of electricity.
Read MoreI recently lost my collection of electronic components, and was looking for a cheap source of parts I could use in my projects. It turns out that my old, broken uninterruptible power supply was a goldmine of useful components! Check out the video to see what I found inside. It turns out that I had […]
Read MoreI made a robotic cat toy to keep my cat out of trouble. The project was built around the Axon microcontroller board and most of the effort was all in the software. The source code and project files are here, intended to be compiled with AVR Studio, AVR GCC and AVRlib. For more info about […]
Read MoreSo I recently got hold of some 2600F (no that is not a typo) ultracapacitors with an insanely low ESR of 0.7 milliohms, meaning they can discharge hundreds of amps even at low voltages. This video shows you some of the mayhem I got up to, and teaches some important capacitor formulas along the way. […]
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