Impedance-matching Transformer

Impedance matching transformer is used to couple an antenna in a transmission and / or reception equipment. It was widely used in the coupling of the antenna to the analog television, by radio amateurs and in tubes amplifiers

What is Impedance?

Impedance (Z) shows the opposition to the flow of direct or alternating current. Impedance is the vectorial addition of resistance (R) and reactance (X). 

What is the Impedance of an Inductor?

The impedance of an inductor (also called inductance) is the measure of the opposition to a change of electrical current in this component.

OR and AND logic gates made with diodes

Diode Logic OR gate (wired OR connection) and Diode Logic AND gate (wired AND connection). Diode Logic uses the fact that diodes conduct only in one direction. (they behave like switches)

Ideal Transformer

The ideal transformer is an electromagnetic device that allows to increase or decrease the alternating voltage and current while maintaining constant the power

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.

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.

BCD Code: Binary Coded Decimal

In order to share information in digital format, it is common to use a binary or hexadecimal representations (BCD Code). There are other methods to represent this information and one of them is the BCD code.

What is an Inductor – Coil?. Inductance – Inductance Units

Inductor stores energy in form of magnetic field due to the self-induction phenomenon. A cable where a current circulates, has on its surroundings a magnetic field.

What is a relay?

Relay was invented in 1835 by the US scientist Joseph Henry (1797–1878). Relay or elecromagnetic relay is a magnetically operated switch that is activated or deactivated when the electromagnet is energized.

Op-Amp Voltage follower / Op-Amp Voltage Buffer

Op Amp Voltage follower (Op Amp voltage Buffer). A buffer has an output that is exactly as the input. This behavior help solve impedance coupling problems.

What is Direct Current? – DC

Direct Current (DC), is the result of the flow of electrons (negative charge) in a conductor (most of the time, wires of copper) that goes only in one direction.