What is a Schottky Diode? (Schottky Barrier Diode)

What is a Schottky Diode? (Schottky Barrier Diode)

What is a Schottky Diode? The Schottky diode or Schottky Barrier Diode unlike the semiconductor diode that has a P-N juntion, has an N-Metal junction. These diodes are characterized by their switching speed and low voltage drop when they are forward biased (typically 0.25 to 0.4 volts). Its symbol is showed on the following diagram. This diode works allmost like the […]

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What is a Phototransistor? - Phototransistor Equivalent Circuit

What is a Phototransistor? – Phototransistor Equivalent Circuit

A phototransistor is essentially the same as a common transistor, but it can work in two different ways:

– As a common transistor, using the base current (IB)
– As a phototransistor, using the light that illuminates this element and that acts as the base current. (IP).

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JFET Saturation and Breakdown regions

JFET Saturation and Breakdown regions

JFET Saturation and Breakdown regions The JFET Saturation region In this region the JFET has some linear features that are used in amplification. These features are similar to those of a BJT in the linear region. The JFET behaves as a voltage controlled (VGS) current source which ID is virtually independent of the voltage VDS. The equation that relates the current ID with the […]

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JFET Cutoff and Linear regions

JFET Cutoff and Linear regions

JFET Cutoff and Linear regions JFET Cutoff region In this region the current flowing from the Drain to the Source terminals of the JFET is zero (ID = 0). In this case, the voltage between the gate and the source terminals is sufficiently negative to block the flow of the current through the channel between the drain and the source […]

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LDR - Light Dependent Resistor - Photoresistor

LDR – Light Dependent Resistor – Photoresistor

LDR – Light Dependent Resistor – Photoresistor LDR (light dependent resistor) is a resistor that has a value that varies depending on the amount of light it has on it. Photoresistor is manufactured with crystalline structure materials using its photoconductive properties. The most common crystal used are: cadmium sulphide and cadmium selenide. The photoresistor (LDR) symbol is: LDR’s range values goes from […]

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Optocoupler (LED and  phototransistor)

Optocoupler (LED and phototransistor)

Optocoupler: LED and  phototransistor The Optocoupler is a device that consists of a LED (light-emitting diode) and a phototransistor. When the LED emits light, it illuminates the phototransistor causing a current to flow trought it. These two elements are coupled in the most efficient possible way. The Ic output current of the optocoupler (phototransistor`s collector current) is proportional to the input current IF (LED`s current). The relation […]

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