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23 Jan 2012

adafruit.com writes:

Hang around any electrical engineer long enough, and you’re bound to hear the word inductance tossed around. Or perhaps if you’re hanging around people dealing with high-speed signals, an ugly little thing called “cross talk” might get mentionned a lot (hint: it has nothing to do with speaking in an angry voice to your troublesome PCB, or any uncomfortable attempt to proselytize it and save it from eternal damnation in a lake of molten solder). If you’ve ever wondered what either of these terms mean (and how they’re related), you might find it worthwhile reading this relatively accessible ‘app note’ of sorts explaining what inductance is and why it matters: What Really is Inductance? (by Dr. Eric Bogatin)

What Really is Inductance? - [Link]

23 Jan 2012

Basics: Introduction to Zener Diodes @ Evil Mad Scientist Laboratories – [via]

Zener diodes are a special type of semiconductor diode– devices that allow current to flow in one direction only –that also allow current to flow in the opposite direction, but only when exposed to enough voltage. And while that sounds a bit esoteric, they’re actually among the handiest components ever to cross an engineer’s bench, providing great solutions to a number of common needs in circuit design.

In what follows, we’ll show you how (and when) to use a Zener, for applications including simple reference voltages, clamping signals to specific voltage ranges, and easing the load on a voltage regulator.

Basics: Introduction to Zener Diodes - [Link]


28 Nov 2011

Collin’s Lab: Schematics – [via]

Schematics are the functional diagram of electronic circuits. With so many designs available on the web, understanding how to read schematics can unlock a world of possibilities for the electronics maker. In fact, if you can read a schematic, you can build a circuit before even understanding how it works!

Collin’s Lab: Schematics - [Link]

22 Nov 2011

jumperone.com writes:

In this article I will tell you how to get shorter relay switching times and how to minimize relay current consumption. The same exact things apply to solenoids and solenoid valves.

You need to use a transistor because either relay you want to control needs a higher voltage than your microcontroller can provide, or relay’s current demand is too high. Although some microcontrollers can give enough current to switch a relay, but most of them is incapable of doing that.

And the diode in parallel with relay coil (or solenoid coil) is needed to suppress the flyback voltage that occurs when transistor is switching-off and magnetic field stored in coil collapses. That flyback voltage can reach hundreds of volts, which can completely destroy the driving transistor.

Using Relays (Tips & Tricks) - [Link]

2 Oct 2011

A Beginner’s Guide to the MOSFET @ ReiBot.org. [via]

If you need to switch high current and or high voltage loads with a micro controller you’ll need to use some type of transistor. I’m going to be covering how to use a MOSFET since it’s a better option for high power loads. This guide will be just a brief introduction that will discuss how to drive a mosfet in a simple manner with the ultimate goal of making it act like an ideal switch.

Refer to the N or P channel basic wiring schematics and remember the three pins: Gate, Drain, and Source. When I mention something like Gate-Source potential difference, I’m talking about the difference in voltage between the two pins.

A Beginner’s Guide to the MOSFET - [Link]

26 Sep 2011

Jeri shows the basic construction of solenoid actuators and demonstrates the relationship between strength and hold power relative to current flow in the coil. [via]

Solenoid Basics - [Link]

18 Jun 2011

Bill explains the basics of Phase Lock Loops(PLLs) and their uses.

Phase Lock Loops 101 with Bil Herd – [Link]

25 May 2011

ermicro.com writes:

Resistor basically is used as a current limiter or current/voltage divider in electronics circuit. Resistor value is measured in Ohm (Ω) name after George Simon Ohm who first to lay down the fundamental relationship among Resistance, Current and Voltage. This relationship is known as Ohm’s law; basically the Ohm’s law say that the current flow in the closed circuit is equal to the voltage divided by the total resistance occur in the circuit or we can write the Ohm’s law equation as follow:

Basic Resistor Circuit - [Link]

25 May 2011

ermicro.com writes:

Resistor is one of the electronic component that used in electronic design for controlling the flow of electric current. The more it resists the small the electric current will flow and vice verse. The resistance value is measured in ohm which is named after Georg Simon Ohm who first define the well known Ohm law, the fundamental relationship among Resistance, Current and Voltage. The symbol of resistance is the Greek letter omega (Ω).

How to read the Resistor value - [Link]

16 May 2011

Fileark writes:

I decided it would be easiter to explain AC and DC current if the user already knew how to use and oscilloscope. Explaining how to use an oscilloscope is easy if the user already knows what DC and AC current is. I think the video worked out as a fast paced tutorial for both subjects.

AC vs DC Explained and How to Use an Oscilloscope – [Link]





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