![]() ![]() When the Gate is triggered, current flows through the Drain and the Source, allowing the LED to illuminate. Altering the setting of the variable resistor, determines when the LED illuminates. ![]() As the temperature drops to below 3 degrees centigrade, the LED illuminates. The 100K variable resistor has been set at a value of 55K. As the temperature drops, the LED illuminates, as a warning light. The temperature sensor circuit below, depends in part on the MOSFET. PICTORIAL REPRESENTATION OF FET / MOTOR CIRCUITĬIRCUIT WIZARD VERSION OF BUZZER / MOTOR CITCUIT ![]() An input to the Gate, triggers the MOSFET, allowing current to flow through the Drain and Source, driving the motor the and buzzer.ĬIRCUIT WIZARD VERSION OF FET / MOTOR CITCUIT The two circuits below include a N channel MOSFET. MOSFET-Metal Oxide Semiconductor Field Effect Transistor MESFET-Metal Semiconductor Field Effect Transistor It stands for metal oxide semiconductor field effect transistor. What is the difference between MOSFET and FET A MOSFET is a type of FET. Bipolar junction transistors are preferred for amplifier circuits, as they produce more GAIN than FETs.Ī variety of FETs are available - some are shown below. In the PNP transistor, P stands for positive and the majority charge carriers are holes whereas in the NPN transistor, N stands for negative and the majority charge carriers are electrons. Therefore, a finished commercial circuit, will have a smaller footprint, than one incorporating BJTs.Īlthough FETs are more expensive to manufacture than BJTs, they are preferred in most commercial circuits, with the exception of amplifier circuits. Consequently, they are ideal for providing an output for solenoids and motors, ensuring that they work properly. FETS have the advantage, that they are voltage controlled devices, whereas BJTs, such as NPN transistors are current controlled, drawing more current from a circuit.įETs offer more protection to a secondary circuit. They have a relatively high input resistance, which is an advantage over BJTs. However, it requires vary little current to trigger the gate, unlike BJTs.įETs are digital devices, acting as a ‘switch’ or as an ‘amplifier’. CurrentNMOS: currentows from drain to source.NPN: current ows from collector to emitter. When the gate is triggered, it allows current to flow through the drain and source. Circuit symbols and physical structuresNMOS has symmetricstructure for drain and source.NPN has asymmetricstructure for collector and emitter. The gate of a FET, plays a similar role as the base of a BJT. PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEETįETs have a source, drain and gate, which are arranged in a similar way, to the ‘pins’ of a bipolar junction transistor (BJTs), such as an NPN or PNP transistor - collector, base and emitter. FIELD-EFFECT TRANSISTORS - FETs CLICK HERE FOR INDEX PAGE ![]()
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