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It is also included the development of equivalent circuits of transformers, energy efficient induction motors, electric motors, hysteresis motors, and the section on power semi-conductors. ...
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How to measure 2KVac using a DMM

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Electronics and Tips on Building a Basic Electronic Circuit

Electronic components are physical entities within the system. Their sole purpose is to affect the associated fields or the electronic via a desired reliable method with the intended purpose of the electronic system. Some of the usual components are transistors, diodes, resistors, and capacitors.
Digital devices are types of electronic systems that use digital signals. Its representation of Boolean algebra is commonly used in mobile phones, computers and other costumer products. Digital devices and other digital circuits are usually made from big assemblies of logic gates.
Analog devices are electronic systems with a constant variable signal. The earliest device invented was the analog. The major difference between digital and analog electronics is its noise, precision and design difficulties.
The process information is programmable in analog electronics. They are more vulnerable to noise as compared to digital electronics. In digital, as the information is programmed and as the signals stay long inside the range value, digital devices represent identical information similar to analog devices.
Digital electronics are much smaller and easier to design as compared to similar analog electronic processes. This is one of the major reasons why the latter is more common and preferred. An analog device should be designed by hand. The procedure is less automatic as compared to digital.
There are numerous electronic stores around the world. The Correctional Electronic Store is one of the more known. It was built with the intent to support the Correctional Facility Industry or CFI having the quote systems for replacement and spare parts. This is deemed as the major requirement for the maintenance of all fire alarms and security systems that are operational within the facility. The store has a large variety of manufacturers that provide excellence parts, specifically for part replacements and system maintenance.
Dick Smith Electronic is the largest online retailer of Entertainment, Electronic, Communication and Computer products in Australia. Its online store provides consumers with not only exceptional ranges of products but also unbeatable after-retailing support and first class service. The leading products of the store include Yamaha, Sharp, Philips, Panasonic and Samsung as well as Sanyo, Canons and so much more. Dick Smith Electronic has several headquarters, particularly in New South Wales, South Australia and Western Australia. They also have stores in Victoria, Queensland, Tasmania and the Northern Territory of Australia.
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You can build an electronic circuit yourself also. It is quite easy. First buy some load. The simplest load can be used in a basic circuit. This would include an motor and lamp as well as a buzzer. Find some low-power components from several stores like RadioShack.
Buy a battery and power supply. For electronic circuits, the power supply should be as close as possible to the electrical energy of the components, without the need to leave over. You can purchase everything you need.
Connect one of the batter terminals to the button or switch. You can only do this by holding the uncovered end of one of the wires. Then, finish wiring of the circuit and place the batteries. Connect some load terminals to the free terminal of the holder of the battery.

Mini Alarm Circuit Schematic

Suitable for doors & windows, Portable anti-bag-snatching unit
This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched abruptly, the magnet looses its contact with the reed switch, SW1 opens, the circuit starts oscillating and the loudspeaker emits a loud alarm sound. A complementary transistor-pair is wired as a high efficiency oscillator, directly driving a small loudspeaker. Low part-count and 3V battery supply allow a very compact construction.


Circuit Diagram:

Mini Alarm Circuit Diagram


Parts:

Resistors
R1 = 330K
R2 = 100R

Capacitors
C1 = 10nF-63V
C2 = 100uF-25V

Semiconductors
Q1 = BC547
Q2 = BC327

Miscellaneous
B1 = 3V Battery or Two AA Cells in Series
SW1 = Read Switch & Small Magnet
SPKR = 8R Loudspeaker (See Notes)


Notes:
The loudspeaker can be any type; its dimensions are limited only by the box that will enclose it.
An on-off switch is unnecessary because the stand-by current drawing is less than 20µA.
Current consumption when the alarm is sounding is about 100mA.
If the circuit is used as anti-bag-snatching, SW1 can be replaced by a 3.5mm mono Jack socket and the magnet by a 3.5mm. Mono Jack plugs having its internal leads shorted. The Jack plug will be connected to the tiny cord etc.
Do not supply this circuit at voltages exceeding 4.5V: it will not work and Q2 could be damaged. In any case a 3V supply is the best compromise.
Reference >> http://www.circuit-lab.com/2009/10/mini-alarm-circuit-schematic.html