Using multimeter to measure the voltage of a battery and resistance of a resistor. \n Resource: bit.ly
CS3651 – Using Multimeter in a Circuit
By January 26th, 2012, underField-Effect Transistors Technology
By January 23rd, 2012, underField-Effect Transistors Technology The majority of power electronics circuits are nowadays built on insulated-gate field-effect transistors. In fact, in digital, and just as much, in power devices field-effect transistors are used more often than their bipolar counterparts. First of all, field-effect transistors are easier to control – the controller in such devices in insulated from the current transport zone, so no power is required to maintain in it the on-state. As soon as the field-effect transistor is on, its control current is virtually equal to zero. Besides, the charge required for switching is significantly lower, and, therefore, so is the time of charge transfer. These features help to substantially decrease the issue of excessive voltage drop on the device in the static mode, which is inversely proportional to the excessive control charge and dramatically decreases the power-off time of the transistor. That’s why it is much more beneficial to use field-effect transistors due to the simplicity and efficiency of control circuits. Another important factor for power electronics is the fact that the field-effect transistor channel acts as a resistor, so the voltage drop between the source and the drain changes linearly to the current flowing through the channel. This linear relationship is described by the on-state channel resistance according to the RDS terminology, and remains constant at a given switch voltage and chip temperature. As opposed to the pn junction …
PIC 16F628A microcontroller LED Chaser
By January 3rd, 2012, underThe heart of the LED chaser is the PIC 16F628A microcontroller, IC2. The program that runs on this chip controls the LEDs attached to the output port pins. Resistors R1 thru R8 limit the current through LED1 – LED8 to a safe level that won’t damage the PICs I/O ports or LEDs. Resistor R9 provides a pull-up for the input connected to switch S1. R10 holds the PICs MCLR reset signal high. Capacitor C1 is used to decouple the 5 volt power supply to the PIC. The voltage regulator used is a LM2931-5.0, low-drop-out regulator and will maintain regulation with an input voltage down to 6 volts. Input voltage for the LED chaser should be between 6 volts and 14 volts to ensure power dissipation remains within limits. The LM2931-5.0 regulator is designed for battery powered and automotive applications and includes internal current limiting, thermal shutdown, as well as reverse battery connection without damage to itself or the circuit behind it. Capacitor C3 is important and must be fitted to prevent instability of the regulator output. i got this from: picprojects.biz
The Rheostat
By December 30th, 2011, underHere we show how to use a rheostat to vary resistance, then to vary a fixed voltage
Electronics Kit to Build
By December 29th, 2011, underElectronics offers a great deal of scope for innovation for its practitioners. Dabbling with electronics circuits can be a feverish hobby for the interested people. There are plenty of circuit diagrams and electronic components like diodes, resistors, capacitors, transistors and integrated chips (ICs) that are available in the market at a reasonably low cost. A person who is interested in electronics can buy these items and indulge in making and experimenting with a variety of fancy electronics items that range from clocks to robots. It is actually a good hobby to encourage among kids for it provides for a channel for the kids to vent their creativity and vigorousness in a constructive way.
Electronic kits contain electronic diagrams for making useful electronic equipment like radio, camera or clock and the electronic components like transistors, ICs, capacitors and resistors for making the equipment. The kit also contains printed circuit boards or bread boards for connecting the components and instructions for connecting the components for making a specific device. For printed circuit board, the user needs to know how to solder these components into the board using a soldering iron and lead. In the case of bread boards, no soldering is required. One can plug in the components into the interconnected holes of the breadboard. The electronic kits are generally intended for children and people who take electronics as a hobby after growing up. Most of the equipment that can be made using electronic kits are generally harmless and largely contain a surprise value.
There are several companies that offer a variety of electronics kits. A company called MadLab Electronic offers electronic kits under three categories: for beginners, for medium-level users and for advanced users. For using MadLab’s electronic kit, the user needs to have a soldering iron, wire cutter and a solder sucker. The last one may be highly useful because it is used to unsolder the circuits. The beginners’ kit provides an opportunity for the user to make devices like burglar alarm, lie detector, flashy lights and electric telegraph. The medium kit provides an opportunity to construct devices like music synthesizer, electronic guitar, bugging device and strength calculator. With the advanced kit one can make items like rocket launcher and frequency meter.
There is another company called AmeriKit Electronic Educational Kits, which also offers kits for a variety of devices. In addition to the electronic components, printed circuit board and easy-to-follow instructions, the kits also contain the electronics theory behind the working of all the electronics devices that can be made using that particular kit. They provide kits for many devices such as radio, burglar alarm, camera, flash lights, door bells, rain detector, metal detector and voltage drop alarm. Apart from the above-mentioned companies, there are numerous companies that offer electronics kits. Most of the kits are similar in nature. Some companies are offering electronics kits even to construct a robot at home.
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