What is a 7-segment Display?
The 7-segment display, is a component used to represent numbers in many electronic devices.
Today, it is very common to find LCDs in much electronic equipment, but there are many that still use the 7-segment display for its simplicity.
What is a Darlington transistor?
The Darlington transistor is a special type of transistor with a high current gain. It consists of two internally bipolar transistors being connected in cascade
FET (JFET)
Field effect transistor or FET is a particularly interesting transistor and it can be of two types: the Junction Field Effect Transistor or JFET and the Metal-Oxide Semiconductor Field Effect Transistor (MOSFET).
TRIAC. Power control on alternating current (AC)
Triac is a semiconductor device that belongs to the family of thyristor control devices. It is essentially two SCR connected in parallel and backwards, sharing the same gate.
The semiconductor diode is the simplest semiconductor device and can be found in almost any electronic circuit. Diodes are manufactured with germanium and silicon (the most common).
FET characteristics
The N-channel JFET consists of a silicon bar of N-type semiconductor with two P type regions on both sides. JFET is a tri-terminal device whose terminals are called drain, source and gate.
Saturation region of a N channel Mosfet transistor The NMOSFET transistor behaves as a voltage controlled current source VGS. Check the following equations: where ß = K (W/L) In this region, the quadratic relationship between VGS and ID is shown in the left part of the picture. Similarly to the JFET transistors, it can be used to identify, by […]
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 […]
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 […]
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 through 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 (LED’s current). The relation between […]
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 injected […]