DATASHEET and Circuit Diagram

Herein, we provide you with an article on Understanding Overvoltage Categories in conjunction with high voltage spike or transient for your safety. These transients are “invisible” and largely unavoidable hazards on electrical systems and regularly occur on low voltage power circuits in turn can reach peak values in many thousands of volts. This article was aimed to contribute significant inprovement in protection circuit since it was a momentary high-voltage spike or transient that hit some electronic device without warning.

You will be taken into sections such voltage spikes as an unavoidable hazard, transient protection, overvoltage installation categories (click the picture), independent testing as the key to safety compliance, protection against two major electrical hazards, arc blast and electric shock, applying the concept of overvoltage categories into every day work, tips to help you work safely, and a table consist of transient test values for overvoltage installation categories.

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According to one article i’ve found, it may be predictable that growth of the high-brightness LED (HB LED) market in the next few years will be driven by general lighting, display backlighting, and automotive applications since HB LEDs have no hazardous materials such as mercury, consume less power, and longer lifespan. And here we provide you with the article information which will describe you all about HB LED driver especially for various automotive lighting applications.

In the description of the article there are sections such how important a constant current for HB LEDs, HB LED Diming, Linear HB LED driver (MOSFET in series) Circuits for Interior Lighting, Switch-Mode Step-Down Drivers for Automotive Exterior Lighting, Switch-Mode Buck-Boost (SEPIC) Drivers for Automotive Front Lights, and Switch-Mode Boost Drivers for LCD backlighting. Every sections are described in a brief and clear explanation.

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If you need a voltage regulator designed primarily for series regulator applications you may consider National LM723/723C voltage regulator. This device is used to be applied in a wide range applications such as shunt regulator, current regulator and/or temperatur controller.

This LM723/723C voltage regulator will supply output currents up to 150mA without external pass transistor, but if you desire any load current you can add an external transistors on it which will drive output currents in excess of 10A possible. LM723?723C has 40V max of input voltage with an adjustable output voltage range from 2V to 37V, according to the datasheet.

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Below we provide you with an article concerning A Simple Test Circuit for high voltage impulse-Surge Generator Device. It will describe you with three types of surge generator circuits which can be used to produce a simple and economical system limited to generating surge wave shape on a 120 V single phase circuit.

What are those three circuit for this purpose? There are General Purpose Ignition Switch Generator (for 20 kV, 20kA pulse) Circuitry, Thyristor Switch and Step Up Pulse Transformer Circuit (specific spike production on the a-c line), and Relay Type Switch with Resonant Circuit. Each of those three circuit are described in detailed description with such schematic diagram of the surge generator type.

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Herein is the IC741 general purpose operational amplifier (Op-Amp) datasheet which is produced by Philips Semiconductors with uA741/uA741C/SA741C in its branded name. It is a high op-amp with high open loop gain, internal compensation, high common mode range and temperature stability.

This uA741 is a 8-pin IC with Internal frequency compensation, short circuit protection, high input voltage range, and excellent temperature stability in its features. This device are available in 8-Pin Plastic Dual In-Line Package (DIP), 8-Pin Ceramic Duali In-Line Package (CERDIP), and 8-Pin Small Outline (SO) Package. You will see the uA741 Pin Configuration, DC and AC Electrical Characteristics, and the uA741 Equivalent Schematic (click to enlarge) within the datasheet.

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Many electronic equipments such as computers, laptops, and some desktops ship with low-power versions of RS232 ports. It seems has no ability to drive port-powered devices or full length RS232 cabling. In order to fulfill this purpose, The RS232 Line Booster is used for cable extension, amplify (Boosting Low Power Ports) and filter data and handshaking signals. Below is the internal system diagram to determine the direction of signal flow in RS232 Line Booster Installation.

This RS232 Line Booster internal circuit diagram shows the direction of flow on each line. Connect directly the male connector toward the computer and the female connector end should go toward a CRT, printer or any other interface. And there is recommendation that extension cables be no longer than 50 feet (15-25 m).

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