Author: misamaliraza94
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Active High Pass Filter
An Active High Pass Filter can be created by combining a passive RC filter network with an operational amplifier to produce a high pass filter with amplification. The basic operation of an Active High Pass Filter (HPF) is the same as for its equivalent RC passive high pass filter circuit, except this time the circuit has an…
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Active Low Pass Filter
By combining a basic RC Low Pass Filter circuit with an operational amplifier we can create an Active Low Pass Filter circuit complete with amplification. Active filters such as an active low pass filter, are filter circuits that use an operational amplifier (op-amp) as the their main amplifying device along with some resistors and capacitors…
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Passive Band Pass Filter
Passive Band Pass Filters can be made by connecting together a low pass filter with a high pass filter. The Passive Band Pass Filter can be used to isolate or filter out certain frequencies that lie within a particular band or range of frequencies. The cut-off frequency or ƒc point in a simple RC passive filter can…
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Passive High Pass Filter
A High Pass Filter is the exact opposite to the low pass filter circuit as the two components have been interchanged with the filters output signal now being taken from across the resistor. Where as the low pass filter only allowed signals to pass below its cut-off frequency point, ƒc, the passive high pass filter circuit…
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Passive Low Pass Filter
A Low Pass Filter is a circuit that can be designed to modify, reshape or reject all unwanted high frequencies of an electrical signal and accept or pass only those signals wanted by the circuits designer. Passive RC filters “filter-out” unwanted signals as they separate and allow to pass only those sinusoidal input signals based…
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Capacitive Reactance
Capacitive Reactance is the complex impedance of a capacitor who’s value changes with respect to the applied frequency. Capacitive Reactance is the complex impedance value of a capacitor which limits the flow of electric current through it. Capacitive reactance can be thought of as a variable resistance inside a capacitor being controlled by the applied frequency.…
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Hall Effect Sensor
We could not end this discussion on Magnetism without a mention about magnetic sensors and especially the very commonly used Hall Effect Sensor. The hall effect sensor is a type of magnetic sensor which can be used for detecting the strength and direction of a magnetic field produced from a permanent magnet or an electromagnet with…
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Electromagnetic Induction
When a DC current passes through a long straight conductor a magnetising force and a static magnetic field is developed around it. Electromagnetic induction uses the relationship between electricity and magnetism whereby an electric current flowing through a single wire will produce a magnetic field around it. If the wire is wound into a coil,…
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Magnetic Hysteresis
The lag or delay of a magnetic material known commonly as Magnetic Hysteresis, relates to the magnetisation properties of a material by which it firstly becomes magnetised and then de-magnetised. Ferromagnetic materials when subjected to a temporary magnetic field can exhibit a lag or delay in the demagnetisation process due to the material from which…
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The Electromagnet
A simple electromagnet can be created by wrapping a coil of wire around a soft iron core, such as a large nail. The electromagnet is a type of temporary magnet in which its magnetic field is produced by electric current and to concentrate the magnetic field, the wire of an electromagnet is wound into a…