Why is Darlington array not as efficient as MOSFET as a stepper motor controller?
It is due to the saturation voltage of Darlington pairs, which is normally 1 V. With a load of 1A, the device consumes 1 W. Quite a challenge for cooling…
What is motor protection?
Motor protection is the isolation of the motor from the main supply in the event of an abnormal condition in the operating state of an motor (i.e. when the motor…
How does a DC motor work?
There are basically two principles that govern a DC motor. How to repel poles of a magnet and tighten them differently. We have all played with magnets and are familiar with…
Why do you need a current limiting resistor to drive an LED if the LED draws only as much current as it requires?
The current consumed by the LEDs is given by (Vin-Vf) / Rs which depends on the applied input voltage Vin, the direct voltage drop of the LEDs Vf and the…
How electricity generate?
Methods of electricity generation There are seven basic methods to convert other forms of energy directly into electrical energy: Static electricity through physical separation and charge transport (examples: triboelectric effect…
Why do old vacuum tube amplifiers sound so rich compared to modern Transistor FET amplifiers?
There are mutliple reasons for this: Tube amplifiers produce more even harmonics than solid state amplifiers. Solid state amplifiers, on the other hand, are rich in odd order harmonics. For some evolutionary…
What is rectifier circuit?
A rectifier is an electrical device that consists of one or more diodes and converts alternating current (AC) to direct current (DC). A diode is like a one-way valve, in which electrical…
How to test a thyristor?
How to test a thyristor (SCR): Obtain a bench DC power supply with adjustable output voltage and current limit. For example 0–30Vdc 0–5A Set the power supply to around 30 Vdc…
What is a solenoid?
A magnet is a coil of insulated wire that is wound on a rod-shaped form made of solid iron, solid steel or iron powder and generates a magnetic field when…
Why do we use an insulating layer between the gate electrode and the channel region for a MOSFET?
A layer of silicon oxide (SiO 2) typically grows on a silicon substrate and a metal or polysilicon layer is deposited over it. If you observe, this acts as a…