Electronics

Little about JFET

January 30, 2011

The acronym JFET stands for junction gate field-effect transistor and is also known by the term JUGFET. The JFET is the most simple type of field effect transistor currently in use and can be deployed as either a voltage-controlled resistance or an electronically-controlled switch. When deploying a JFET, the electric charge will flow in a [...]

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Resistor color codes

January 30, 2011

How to Read Resistor Color Code Resistors can come in different sizes and shapes allowing for different voltages to go through it. However, unless the size of the resistor is large, the code is rarely written on it because it would require very tiny markings. Therefore, a system was developed to use colors to determine [...]

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Photoresistor

January 30, 2011

A photoresistor is simply a resistor whose resistance depends on the amount of light incidentupon it. Photoresistors are used to make light-sensitive devices, and are often made from cadmium sulfide (CdS). The resistance of a CdS photoresistor varies inversely to the amount of light incident upon it. In other words, its resistance will be higher [...]

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What is a Phototransistor And How It Works

January 30, 2011

A phototransistor is a device that is capable of converting light energy into electric energy. Phototransistors work in a similar way to photoresistors but are able to produce both current and voltage while photoresistors are only capable of producing current. This is because a phototransistor is made of a bipolar semiconductor and focuses the energy [...]

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Silicon Bilateral Switch (SBS)

January 12, 2011

The silicon bilateral switch is used for triggering SCR’s and triacs. Basically, it consist of two silicon unilateral switches, connected in parallel but in opposite directions as shown in figure 1. The schematic symbol of silicon bilateral switch is shown in figure 2. The operation of a silicon bilateral switch is similar to that of [...]

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Silicon Unilateral Switch (SUS)

January 12, 2011

A Silicon unilateral switch (SUS) is used for triggering SCR,s and triacs. Basically, a silicon unilateral switch is a four-layer diode that resembles the SCR in which the contacts are made only to anode and cathode. Figure shows the schematic symbol of silicon unilateral switch. The operation of a silicon unilateral switch is similar to [...]

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What is a Thermistor?

January 12, 2011

Thermistors are thermally sensitive resistors and have, according to type, a negative (NTC), or positive (PTC) resistance/temperature coefficient. Thermometrics product portfolio comprises a wide range of both types. Manufactured from the oxides of the transition metals – manganese, cobalt, copper and nickel, NTC thermistors are temperature dependant semiconductor resistors. Operating over a range of -200°C [...]

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Transistor BC-547

January 12, 2011

Data sheet BC547 is an NPN bi-polar junction transistor. A transistor, stands for transfer of resistance, is commonly used to amplify current. A small current at its base controls a larger current at collector & emitter terminals. BC547 is mainly used for amplification and switching purposes. It has a maximum current gain of 800. Its [...]

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Little About Seven Segment Display

January 12, 2011

A seven segment display is the most basic electronic display device that can display digits from 0-9. They find wide application in devices that display numeric information like digital clocks, radio, microwave ovens, electronic meters etc. The most common configuration has an array of eight LEDs arranged in a special pattern to display these digits. [...]

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Stereo FM Transmitter Using I.C – BH1417

January 12, 2011

For enlarge this image you have to save it in your computer and open Here i am describing how to create a stereo FM transmitter by using IC BH1417.  It include lot of features in one small packge It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, [...]

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