Photoresistors

Light-sensitive resistor or Photoresistors are electronic components that resistance will decline if there are additional light intensity about it. Photoresistors can also refer to a light-dependent resistor (LDR), or a photoconductor.

Photoresistors made of semiconductors that have very high resistance. If the light is about to have a high enough frequency, photons absorbed by the semiconductor will cause the electrons have enough energy to jump into the conduction band. 

READ MORE - Photoresistors

Diode

Crystal diodes have been popular before the thermionic diode, thermionic and solid state diodes developed in parallel. The principle of thermionic diodes was discovered by Frederick Guthrie in 1873. 

Semiconductor Diode 

Diodes which are currently based on semiconductor pn junction. In a pn diode, conventional current can flow from p-type side (the anode) to the n-type side (the cathode), but can not flow in reverse. Another type of semiconductor diodes, Schottky diodes, formed from the relationship between metals and semiconductors with a pn junction. 

Diode Pn is a connection material that serves primarily as a rectifier. P-type material into the anode side while the n-type material into cathode. Depending on the polarity of the voltage given to him, the diode can act as a switch is closed (if the anode have a positive voltage while the cathode get a negative voltage) and is valid as a switch is open (when the anode have a negative voltage while the cathode get a positive voltage). These conditions occur only at the conceptual ideal diode. In diodes factual (real), it is necessary voltage greater than 0.7 V (for diodes made of silicon material) at the anode to the cathode to the diode can deliver an electrical current.Voltage of 0.7 V is called a voltage barrier (barrier voltage). Diodes made from Germanium has a beam voltage of about 0.3 V. 

• Light-emitting diode or LED is a diode that emits light when a given forward bias. LEDs are made from semiconductors such as gallium arsenide mixed phosphide (GaAsP), gallium phosphide (GaP), gallium indium phosphide (GaInP), gallium arsenide aluminum (GaAlAs), etc..

• Photo diode (fotovoltaic) is used to convert light energy into electrical energy in the same direction 

• Diode laser is used to generate low-level laser light, the way it works is similar LED 

• Zenner diodes used for voltage regulation. 

Diode light, or better known as LED (light-emitting diode) is a semiconductor that emits incoherent monochromatic light when given a forward voltage. 

Color produced depends on the semiconducting material used, and can be near ultraviolet or near infrared.

READ MORE - Diode

Capacitor

Capacitor is a device that can store energy in the electric field, by collecting an internal imbalance of electric charge. Capacitor has units called farads. Discovered by Michael Faraday (1791-1867). Capacitors are now also known as the "capacitor", but the word "condenser" is still used today. First mentioned by the Italian scientist Alessandro Volta in 1782 (from the Italian condensatore), with regard to the ability of the appliance to store a high electrical charge than other components. 

Polyester capacitor
insulating material used is polyester which dapt provide a relatively high capacitance value. The second metal plate using a paper material or film material which is injected into the insulation.

READ MORE - Capacitor

Kinds of Resistors

Fixed Resistor

• Carbon film resistor is one of the most common types of resistors used and has very good frequency response. Carbon Film Resistor material is a mixture of carbon with a long piece of ceramic rods. This resistor value itself is marked with color code.

• Metal film resistor is made from a mixture of metal and ceramic. physical form of resistor is the same with carbon resistor, which determines the value of resistance equal to the carbon resistor. This resistor difference is the accuracy with carbon resistors and resistor has a temperature coefisient and lower noise, and do not have a voltage coefisient.

• Fuse Resistor is a resistor that functions as a fuse. If the current through the resistor is very large, the resistance of this resistor will be turned into a very large, even infinite.

• Power Wirewound Resistor, These resistors have a larger physical form other resisor, and is commonly used circuits that require very large power. At the time of operation, this resistor can generate substantial heat so it is often covered by other materials such as anodized aluminum, Fiberglass Mandels, ceramic tubes, ceramic rods, etc.

• Precision resistors Wirewound, resistors are the most suitable for use in the DC circuit because it has a very high degree of accuracy up to 0005%, and TCR (Temperature coefficient of resistance) is very low. This resistor is used on the regulator is best suited and least suited to radio frequency (RF) because it has a resonance frequency Q is very low.

• Standard resistor NIST (National Institute of Standards and Technology) is a type of resistor used on the instruments, and is standard in verification token accuracy of a measuring tool.These resistors have a TCR of low and very stable compared to the Precision Wirewound Resistors, and has the highest accuracy of up to 0001%.
• SIP (singgle In Line) is  is a resistor arranged in parallel, and are made in one package. This resistor is usually called Resistor Pack or R-pack.

READ MORE - Kinds of Resistors

Thermistor

Thermistor is a resistor that is usually used to measure temperature. Thermiastor will work if exposed to temperatures or temperature, whereby when the temperature of the thermistor changes in thermistor resistance will also vary. Thermistor is generally made of ceramic or polymer materials. Reference standard thermistor temperature is at room temperature is 25 ° C.

NTC (Negative Temperature Coefficienct)

At the time the surrounding temperature rise resistance value decreases. NTC is a semiconducting ceramic resistor produced by sintering the material at high temperatures, and using metal oxide as the main ingredient.

PTC (Positive Temperature coefficient thermistor)

At the time the surrounding temperature rise resistance value increases.PTC is made of the BaTiO3 ceramics. 

BaTiO3 ceramics is a kind of typical ferroelectric material with a resistivity greater than 10 12 Ω.cm temperatures below normal.

CTR (Critical Temperature Resistor)

Resistance value will decrease rapidly when the temperature

rises above the surrounding temperature is a key point.

READ MORE - Thermistor

Resistor

Resistors

Resistors are electronic components that serves to set or keep the current flowing strong. The units are ohm resistor (Ω).

Fixed ResistorsFixed resistor is the resistor resistance value is not changing, and the amount of prisoners who had symbolized by the color of a circle located throughout the body. Fixed resistors are generally made of carbon materials. Fixed resistors consist of two types namely kesil resistors with power, and resistors with a large power.
Resistors are helpless little resistance values symbolized by the color code, while having great power symbolized by the numbers.

Resistor color code:

No	Color	Ring 1	Ring 2	Ring 3	Ring 4
		1	2	3	4
1	Black	-	0	-
2	Chocolate	1	1	0
3	Red	2	2	00
4	Orange	3	3	000
5	Yellow	4	4	0000
6	Green	5	5	00000
7	Blue	6	6	000000
8	Purple	7	7	0000000
9	Gray	8	8	00000000
10	White	9	9	000000000
11	Gold	-	-	0.1	5%
12	Silver	-	-	0.01	10%

Example:

4 Color

Ring 1 = Orange

Ring 2 = Red

Ring 3 = Yellow

Ring 4 = Gold

So the summary is:

 R = 320000Ω = 320kΩ / 5%

5 Color

Ring 1 = Red

Ring 2 = Red

Ring 3 = Black

Ring 4 = Red

Ring 5 = Chocolate

So the summary is:

R = 22000Ω = 22kΩ / 1%

READ MORE - Resistor

Conductor, Insulator, Semiconductor.

Conductor

Conductor is a device or material that can deliver an electric current. A good conductor is a material having a very small resistivity. In general, the conductive material is metal. Gold, silver, copper, aluminum, zinc, iron in a row has resistivity greater. So the material that has the best conductivity is gold, but because the price is very expensive, the copper and aluminum are economically the most widely used.

Insulator

Insulator is the type of material has a very large resistance, so that he can not deliver electricity and heat. Insulator is usually used to inhibit the flow of electricity which is used on the cable. isolator consisting of non-metal materials such as plastics, ebonite, paper, human body, water, soil.

Semiconductors

Semiconductor is a material that has electrical conductivity in between insulator and conductor.A semiconductor will have properties as an insulator at very low temperatures, but at room temperature besifat as a conductor. The most common semiconductor material used is silicon, germanium, and gallium arsenide.

Very useful in the field of semiconductor electronics, because conductivity that can be altered by injecting another material (usually called the material doping). Semiconductors are the types of materials most widely used and very important in electronic components.

READ MORE - Conductor, Insulator, Semiconductor.

Variable Resistor (Linear Resistor)

 Resistors is not fixed resistors having resistance values that can be altered according to the needs required. Changes may be made by rotating or sliding shaft that is already provided (linear), but there are also changes in the value of resistance will be influenced by the surrounding circumstances (nonlinear) such as temperature, light, sounds, etc., so it can be used as an automatic switch. Here I will discuss about linear resistor.

Resistor Liniear

Potentiometer

Potentiometer is a component of the voltage divider resistance value can be set in accordance with the desire by rotating the leg / trunk. Dituslis resistance value in the form of numbers and can be seen on the body of the potentiometer. Suppose written 50k potentiometer which means it has a 50 kilo-ohm resistance. potentiometer is usually used for bass tone controls, treable, volume.
Several types of potentiometers:

• Linear potentiometer  can produce devices with a resistance between the wiper with one terminal is proportional to the distance between the two because it has a resistive element with constant cross-section. Linear potentiometer used if desired proportional relationship between the rotation axis with the division ratio of the potentiometer, for example controllers are used to set the oscilloscope screen center point.

• Logarithmic potentiometer has a resistive element to the lower or made from materials that have resistivity varies. This gives a resistance device is a logarithmic function of the potentiometer shaft angle. Most of the potentiometer log (especially the cheap) is actually not really logarithmic, but uses two linear resistive path to mimic logarithmic law. Log potentiometer can also be made by using a linear potentiometer and an external resistor. Potentiometer is really very expensive relative logarithmic. Logarithmic potentiometers are often used in audio devices, especially as the volume control.

• Rheostat resistor is often used to handle high currents and voltages and has two terminals are not fixed. Rheostat usually made of resistive wire wrapped around to form a toroid coil with a blower that moves at the top of the toroid, and touched the coil windings of one coil to the next. Three-teminal potentiometer can be used as two-terminal resistor is not fixed by not using a third terminal. Often a third terminal connected to the terminal is not used mops to reduce the resistance fluctuations caused by dirt.

• Digital potentiometer is an electronic component that mimics the functions of analog potentiometers to be implemented on a digital signal.

Trimpot

Trimpot (Tripotentiometer) is a variable resistor which has functions such as potentiometer but it has a small physical form and has a resistance value that can be foxes but by using small tools such as screwdrivers, because to change the resistance value could not use his hands. As a prisoner resistance materials is to use carbon or charcoal.

READ MORE - Variable Resistor (Linear Resistor)