The Semiconductor Diode
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).
Apr 122019
Apr 102019
What is Joule’s Law?
It is known as Joule effect to the phenomenon by which if in a wire circulates an electrical current, part of the energy is transformed into heat. This law (Joule’s Law) is named after the British physicist James Prescott Joule.
Apr 092019
Police Style Strobe Light Circuit.
This circuit shows the familiar lights which are used on police cars. It uses a 555 timer as a clock for the 4017B decade counter, two transistors and twelve LEDs
Apr 082019
Logic Probe using NOT Gates (Inverters)
This logic probe using NOT Gates is implemented with three NOT gates, one rectifier diode, two LEDs and two resistors.
Apr 042019
Second Right-Hand Rule – Electromagnetism
Second Right-Hand Rule. When a current flows through a conductive wire a non-visible effect called the electromagnetic field is generated around it.
Apr 032019
What is Electrical Resistivity?
Electrical resistivity [ρ] (rho) is a characteristic of materials and has ohm-meter unit. Resistivity indicates how much the material opposes the flow of electric current.
Apr 022019
Why is there a diode connected in parallel to a relay coil?
The purpose of a diode connected in parallel to a relay coil (flywheel diode or freewheeling diode) is to avoid damaging some nearby components sensitive to high voltage.
Apr 012019
How to test Diodes and how to test Transistors
Method to follow to to test a diode or transistor to know if they are working fine
Mar 262019
How to Make a Diode Tester Circuit using 741?
This diode tester circuit checks if the diode is in good condition and also determines its polarity. To accomplish our goal, we use an 741 operational amplifier (IC1) configured as an oscillator.
Mar 252019
How to make a Light Sensitive Sound Generator Circuit?
An oscillator circuit may have many applications. The diagram below shows how to make it work as a light sensitive sound generator using a LDR and a 741 operactional amplifier.
Mar 242019
What is the Impedance of a capacitor – Capacitive reactance?
The Impedance of a capacitor (Capacitive reactance) is the measure of the opposition to a change of the electrical current in this component.
Mar 222019
Mesh analysis in a resistor network – Mesh current method in a resistor network.
Mesh current analysis or the mesh current method is a technique used to find the currents circulating around a mesh with in any closed path of a circuit.