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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7-segment Display

7-segment Display

Seven Segments Display, 7-segment Display The 7-segment display, is a component that is used to represent numbers in many electronic devices. Today, it is very common to find LCDs in many electronic equipments (due to its very low energy demand), but there are many that still use the 7-segment display for its simplicity. This element is made in a way […]

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LED - Light-emitting diode

LED – Light-emitting diode

LED – Light-emitting diode Light-emitting diode (LED) is a special type of diode, that emits light when it is forward biased. There are LEDs of various colors. LED colors depend on the material with which they were built. There are red, green, yellow, amber, infrared, etc. If a current flows through a semiconductor diode, there are electrons and holes […]

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Photodiode. Light detector diode

Photodiode. Light detector diode

The Photodiode – Light detector diode Photodiode looks similar to the common LED, but it has a feature that makes it very special. It is a device that converts light into current. Incident Light (red  arrows). Direction of the generated current (blue arrow). This current flows on the opposite direction of the arrow of the diode and is […]

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